Are you tired of failing marine fire inspections? Choosing the wrong core material wastes money and delays your project. Rock wool offers the perfect balance of safety and cost.
Rock wool is the top choice for marine accommodation panels because it fully delivers A-class fire resistance, superior STC acoustic ratings, thermal insulation, and moisture resistance. Unlike honeycomb or foam, rock wool meets strict IMO SOLAS regulations while remaining cost-effective for shipyard interior projects.
Let me share what I have learned about rock wool panels from my years on the factory floor to my current work in marine outfitting. Read on to see exactly why this material dominates the shipbuilding market.
What STC Rating Does Rock Wool Core Achieve in Marine Accommodation Panels?
Do noisy ship cabins lead to crew complaints? Poor soundproofing ruins rest. You need to know exactly how much noise rock wool panels can block.
Depending on panel thickness and rock wool density, marine accommodation panels achieve an STC rating between 30 dB and 45 dB. Standard 50mm panels hit 30-35 dB. Double-wall systems and heavier densities exceed 40 dB. This full range meets all standard IMO noise limits for crew spaces.
Understanding Sound Transmission Class (STC) in Standard 50mm Marine Panels
Shipyards always ask me how to stop noise in standard cabins. The most basic solution is the standard 50mm marine accommodation panel. This panel uses rock wool inside. The rock wool traps sound waves. A standard 50mm panel with a normal density core gives an STC rating of 30 to 35 dB.1 This number is very important. The International Maritime Organization (IMO) wrote rules for noise. These rules are in IMO Resolution MSC.337(91)2. This rule says cabins must not have too much noise. The 30 to 35 dB reduction blocks normal talking and engine hum. We use this standard panel thickness for most basic crew cabins because it is cheap and easy to install. The rock wool density helps here too. The fibers in the rock wool break up the sound energy.3 So, the sound does not pass through the wall to the next room. I saw this tested many times in the factory.
Achieving Higher STC Ratings with Double-Wall Marine Systems and Heavier Densities
Sometimes a standard panel is not enough. Captain rooms and meeting rooms need more quiet. We cannot just use a single standard panel. We must change the panel thickness or use heavier densities. Often, we build a double-wall system. We place two 50mm panels side by side. We leave an air gap between them. This air gap and the two layers of rock wool work together. This system gives an STC rating of 40 to 45 dB or more.4 A rating of 45 dB blocks loud noises and loud machines. We also use heavier rock wool densities to block low sounds. Heavy rock wool has more mass. Mass blocks sound very well. This method costs more money, but it solves the noise problem for high-end ship projects.
| Marine Panel Configuration | Rock Wool Core Detail | Expected STC Rating Range | Typical Ship Application |
|---|---|---|---|
| Standard Single Panel (50mm) | Normal Density | 30 - 35 dB | Basic Crew Cabins |
| Thick Single Panel (100mm) | Heavy Density | 36 - 39 dB | Officer Cabins, Corridors |
| Double-Wall System (50mm x 2) | Normal Density + Air Gap | 40 - 45+ dB | Captain Rooms, Meeting Rooms |
How Does Rock Wool Density Affect Fire Rating in Marine Accommodation Panels?
Are you worried about failing fire safety tests? Picking the wrong density means sudden project failure. Density directly controls how panels block fire.
Rock wool density dictates the fire rating by determining thermal mass and structural stability during a fire. Lower densities around 120 kg/m³ suit B-15 ratings. Higher densities of 150 kg/m³ are required for A-60 ratings. Both ensure the unexposed side stays below 180°C per IMO regulations.
The Role of 120 kg/m³ Density in B-15 Class Marine Panels
Fire safety is the most important part of marine outfitting. The IMO Fire Test Procedures (FTP) Code tells us exactly what to do. Rock wool density changes how the panel acts in a fire. Density means how much rock wool is packed into one cubic meter. Lower densities give lower fire ratings. For example, we often use a density of 120 kg/m³ for B-class panels. A B-15 panel must block fire for 30 minutes. It must also stop heat for 15 minutes. The unexposed side must not get hotter than 180°C.5 The 120 kg/m³ density has enough thermal mass to do this job. It slows down the heat. It does not melt quickly. We use B-15 panels for normal room walls where the fire risk is low. The lower density also keeps the price low. This helps buyers save money on big shipyard projects.
The Impact of 150 kg/m³ Density on A-60 Class Marine Panels
High fire risk areas need strong panels. We call these A-class panels. An A-60 panel must block fire for 60 minutes. It must also stop heat for 60 minutes. We cannot use the lower 120 kg/m³ density here. The panel would fail the test. The heat would pass through too fast. So, we use a higher density of 150 kg/m³. This heavy rock wool has great structural stability during a hot fire. The thick fibers do not shrink easily. The 150 kg/m³ density packs more stone fibers into the same space. This blocks the heat completely for one hour.6 I always tell buyers never to use cheap, low-density panels for A-class areas. If the surveyor finds out, you will have to tear down the walls and start over.
| IMO Fire Rating Class | Required Fire Block Time | Required Heat Insulation Time | Common Rock Wool Density |
|---|---|---|---|
| B-0 | 30 minutes | 0 minutes | 100 kg/m³ |
| B-15 | 30 minutes | 15 minutes | 120 kg/m³ |
| A-30 | 60 minutes | 30 minutes | 130 kg/m³ |
| A-60 | 60 minutes | 60 minutes | 150 kg/m³ |
What Rock Wool Density Is Standard for A-60 Marine Accommodation Panels?
Confused by factory density options for A-60 panels? Choosing blindly risks your budget and compliance. You need the exact industry standard numbers.
The standard rock wool density for an A-60 marine accommodation panel is between 140 kg/m³ and 160 kg/m³. A 50mm panel requires 150 kg/m³ density. This specific density keeps the unexposed face temperature rise below 140°C on average for 60 minutes during the IMO FTP Code test.
Analyzing the 140 kg/m³ to 160 kg/m³ Density Range for A-60 Panels
When I worked in the factory, we made thousands of A-60 panels. The core density is always a big topic. The standard rock wool density for A-60 panels is strictly between 140 kg/m³ and 160 kg/m³7. This is not a guess. This is based on real fire tests. To pass the IMO FTP Code test, the panel must stop the fire. But more importantly, it must stop the heat. The test measures the temperature on the cold side of the panel. The average temperature rise must stay below 140°C for 60 minutes8. If the density is only 120 kg/m³, the heat moves through the panel too fast9. The temperature goes over 140°C. The panel fails. If the density is 180 kg/m³, the panel passes the test easily. But 180 kg/m³ is too heavy and costs too much money. So, factories and testing labs found the perfect balance. The 140 to 160 kg/m³ range works best.
Why 150 kg/m³ is the Specific Standard for 50mm Panels
Inside that range, 150 kg/m³ is the exact standard for a normal 50mm thick panel10. Almost every major manufacturer uses 150 kg/m³ for their 50mm A-60 panels. I check this number on every order sheet. The 150 kg/m³ density gives the exact thermal mass needed to pass the 60-minute test. It also provides good stiffness. The panel feels strong when you push on it. The steel skins stick to the 150 kg/m³ rock wool very well. The glue holds tight. This makes installation on the ship much easier. Buyers must check their certificates. If an Asian supplier offers you an A-60 50mm panel with only 120 kg/m³ density, you must be careful. It might be a fake certificate. Always demand the 150 kg/m³ standard.
| Rock Wool Density | A-60 Test Performance (50mm Panel) | Cost and Weight Impact | Recommendation |
|---|---|---|---|
| 120 kg/m³ | Fails the heat insulation test | Very cheap, very light | Reject for A-60 use |
| 140 kg/m³ | Barely passes, risky margin | Moderate cost, lighter | Use only if tested |
| 150 kg/m³ | Safely passes average 140°C limit | Good balance | Industry Standard |
| 180 kg/m³ | Easily passes | Very expensive, very heavy | Too heavy for most ships |
How Does Rock Wool Core Resist Moisture in Marine Accommodation Panels?
Dealing with mold and dampness inside cabins? Sea air destroys the wrong materials quickly. Rock wool has specific properties to fight ocean moisture.
Rock wool resists moisture through its naturally non-hygroscopic stone fibers and the addition of special hydrophobic water-repellent binders during manufacturing. It absorbs less than 1% water by volume. This prevents mold growth and keeps thermal performance stable across all humid marine environments.
The Function of Non-Hygroscopic Fibers and Hydrophobic Binders
Ships live in wet places. The air over the ocean has a lot of water in it. This water gets inside the ship. It gets into the walls. Many people think rock wool works like a sponge. They think it sucks up water. But this is wrong. Marine rock wool is very different from normal house insulation. First, the stone fibers are naturally non-hygroscopic11. This means the stone itself does not pull water from the air. Second, factories add special hydrophobic binders12 to the rock wool. "Hydrophobic" means it hates water. These binders are water-repellent chemicals mixed in during production. I have poured water directly onto a block of marine rock wool. The water just rolls off the surface. It does not go inside. Because of the non-hygroscopic fibers and the hydrophobic binders, the rock wool absorbs very little water. According to the EN 1609 testing standard, good marine rock wool absorbs less than 1% water by volume.
Preventing Mold Growth and Maintaining Thermal Performance
This low water absorption is very important for the ship. If a wall core absorbs water, bad things happen. The panel gets heavy. The water rusts the steel skins from the inside. Also, wet panels grow mold. Mold ruins the cabin and makes the crew sick. Because rock wool absorbs less than 1% water, mold has no place to grow. The stone fibers provide no food for the mold. The core stays dry. This also keeps the thermal performance stable. Water conducts heat very fast13. If the panel is wet, it cannot keep the cabin warm in winter or cool in summer. Dry rock wool keeps the air trapped inside the fibers. This traps the heat. This stable thermal performance saves fuel for the ship's air conditioning system in humid marine environments.
| Core Material | Water Absorption Rate | Mold Risk in Humid Cabins | Thermal Performance in Damp Air |
|---|---|---|---|
| Standard Foam | 3% - 5% | Medium Risk | Loses insulation value slowly |
| Paper Honeycomb | Over 15% | Very High Risk | Fails completely |
| Marine Rock Wool | Less than 1% | Zero Risk | Remains stable and effective |
What Acoustic Insulation Index Does Rock Wool Core Offer in Marine Accommodation Panels?
Struggling to meet the strict sound standards for a new vessel? You cannot guess the acoustic performance. We must look at the specific Sound Reduction Index (Rw).
The Sound Reduction Index (Rw) for a 50mm rock wool marine panel is typically 31 dB to 33 dB. By increasing panel thickness to 100mm or adding constrained layer damping plates, the Rw index improves to 40-45 dB. This strictly satisfies all IMO noise reduction mandates.
Baseline Sound Reduction Index (Rw) of 50mm Marine Panels
When engineers talk about sound, they use the Sound Reduction Index. We call this Rw. This number is measured in a laboratory. The ISO 717-1 standard explains how to measure Rw.14 The Rw number shows how well a wall stops sound across different frequencies. For a standard 50mm rock wool marine panel, the Rw is typically 31 dB to 33 dB.15 This is the baseline index. I read these lab reports often when I check supplier documents. The rock wool core creates friction. When sound energy hits the panel, the air inside the rock wool vibrates. This vibration turns the sound energy into a tiny bit of heat energy.16 The sound stops. An Rw of 31 to 33 dB is good for normal crew rooms. It blocks the sound of people talking in the hallway. It blocks the TV from the next room.
Methods to Increase the Rw Index with 100mm Thickness and Damping Plates
But ships have very loud areas. Engine rooms and generator rooms make a lot of noise. A 33 dB panel will not stop engine noise. We must increase the acoustic insulation index. We have two main methods. First, we increase the panel thickness. We use a 100mm thick panel instead of a 50mm panel. More rock wool means more friction for the sound waves. Second, we add constrained layer damping plates. We place a thin, heavy plate inside the panel, right next to the rock wool. This plate stops the steel skins from vibrating. When we use 100mm thickness or damping plates, the Rw index jumps to 40-45 dB. This high number blocks deep engine hums and loud machines. This satisfies the strict IMO noise reduction mandates for spaces near the engine room.17
| Acoustic Enhancement Method | Panel Configuration | Expected Rw Index | Best For |
|---|---|---|---|
| Baseline Rock Wool | 50mm Panel | 31 - 33 dB | Standard Cabins |
| Increased Thickness | 100mm Panel | 38 - 41 dB | Corridors, Hallways |
| Constrained Layer Damping | 50mm + Damping Plate | 42 - 45 dB | Engine Room Boundaries |
How Does Rock Wool Core Affect Marine Accommodation Panel Weight?
Is your ship getting too heavy? Excess panel weight increases fuel costs and hurts vessel speed. You must calculate rock wool weight accurately.
A rock wool core significantly adds to panel weight. A standard 50mm thick panel with a 150 kg/m³ rock wool core weighs about 16 to 18 kg/m², including the steel skins. Designers must balance this heavy A-60 requirement against total vessel payload capacity and fuel efficiency.
Weight Calculation for 50mm Thick Marine Panels
Weight is a massive problem in shipbuilding. Every kilogram counts. When you choose rock wool, you choose a heavy material. It significantly adds to the panel weight. We need to do some math to understand this. Let us look at a standard 50mm thick A-60 panel. The core density is 150 kg/m³. A 50mm thickness is 0.05 meters. So, the rock wool core alone weighs 7.5 kg for one square meter (150 x 0.05). But we must include the steel skins. We use two galvanized steel skins. Each skin is usually 0.6mm thick. The two skins weigh about 9 kg per square meter. We also add the glue. The total weight is about 16 to 18 kg/m². This is very heavy. If a small ship uses 1,000 square meters of panels, the walls alone weigh 18 tons. I always remind buyers to check their weight limits before they order A-60 panels.
Balancing the Heavy A-60 Requirement Against Fuel Efficiency
Ship designers face a hard choice. They must obey the law. The law says they must use heavy A-60 panels near fire zones.18 But heavy ships burn more fuel. Heavy ships carry less cargo.19 This hurts payload capacity and fuel efficiency. So, buyers must balance this requirement. How do they do it? They use A-60 panels only where strictly required by SOLAS rules. For all other walls, they use lighter B-15 panels. A B-15 panel has a 120 kg/m³ core and thinner steel skins. A B-15 panel weighs only about 14 kg/m². By mixing heavy panels and light panels, the shipyard saves weight. This smart planning keeps the ship safe and saves fuel money for the ship owner.
| Panel Type | Core Density | Thickness | Total Panel Weight | Impact on Vessel |
|---|---|---|---|---|
| B-15 Class | 120 kg/m³ | 50mm | ~14 kg/m² | Lighter, improves fuel efficiency |
| A-60 Class | 150 kg/m³ | 50mm | 16 - 18 kg/m² | Heavy, reduces payload capacity |
| High Acoustic | 150 kg/m³ + Damping | 50mm | ~22 kg/m² | Very heavy, used only in small areas |
Conclusion
Rock wool panels offer superior fire protection, acoustics, and moisture resistance for marine outfitting. While they increase vessel weight, choosing the right density ensures IMO compliance and optimal safety.
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"Acoustical properties of particleboards made from Betung bamboo ...", https://bioresources.cnr.ncsu.edu/resources/acoustical-properties-of-particleboards-made-from-betung-bamboo-dendrocalamus-asper-as-building-construction-material/. Published acoustic testing or technical literature on lightweight mineral-wool sandwich panels can be used to contextualize the stated 30–35 STC range for a 50 mm marine accommodation panel. Evidence role: statistic; source type: paper. Supports: A standard 50 mm marine accommodation panel with a normal-density rock wool core typically has an STC rating of 30 to 35 dB.. Scope note: Panel STC depends on facing material, core density, joints, mounting method, and test standard, so external evidence may support a comparable range rather than this exact proprietary configuration. ↩
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"[PDF] MSC.337(91) (adopted on 30 November 2012) CODE ON NOISE ...", https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.337(91).pdf. IMO Resolution MSC.337(91) adopted the Code on Noise Levels on Board Ships, which sets maximum noise-level limits for ship spaces, including accommodation areas such as cabins. Evidence role: historical_context; source type: institution. Supports: IMO Resolution MSC.337(91) contains rules addressing noise levels on ships, including limits relevant to cabins.. Scope note: The IMO code regulates allowable onboard noise levels; it does not prescribe a specific STC value for any particular wall-panel construction. ↩
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"Sound Absorption Properties of Natural Fibers: A Review", https://www.academia.edu/105954057/Sound_Absorption_Properties_of_Natural_Fibers_A_Review. Research on porous acoustic absorbers explains that fibrous materials such as mineral wool dissipate sound energy through viscous and thermal losses as air moves through interconnected pores and fibers. Evidence role: mechanism; source type: paper. Supports: Rock wool fibers reduce transmitted noise by dissipating acoustic energy within a porous fibrous structure.. Scope note: This supports the general acoustic mechanism of mineral wool absorption, not the complete sound-insulation performance of a finished marine wall system. ↩
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"Airborne sound insulation performance of lightweight double leaf ...", https://pmc.ncbi.nlm.nih.gov/articles/PMC11666719/. Building-acoustics literature on double-leaf partitions shows that two separated panels with an air cavity and absorbent material can produce substantially higher sound transmission loss than a single lightweight panel. Evidence role: general_support; source type: research. Supports: A double-wall system using two 50 mm panels with an air gap can achieve higher STC performance, around 40–45 dB or more.. Scope note: The cited evidence may support the acoustic principle and comparable STC ranges, while actual marine-panel ratings depend on spacing, framing, seals, flanking paths, and laboratory test conditions. ↩
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"[PDF] RESOLUTION MSC.307(88) (adopted on 3 December 2010 ...", https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.307(88).pdf. The IMO/SOLAS fire-division criteria define B-class divisions as resisting flame passage for 30 minutes and B-15 divisions as meeting insulation criteria for 15 minutes under the prescribed fire test; the standard expresses temperature limits as allowable temperature rise rather than as a fixed absolute surface temperature. Evidence role: definition; source type: institution. Supports: B-15 marine panels have defined fire-integrity and insulation-performance requirements under IMO fire-test rules.. Scope note: The article’s 180°C wording should be checked against the official temperature-rise criteria, because IMO rules typically specify maximum rises above initial temperature. ↩
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"Determination of Thermal Properties of Mineral Wool Required for ...", https://pmc.ncbi.nlm.nih.gov/articles/PMC10488771/. Research on mineral-wool insulation indicates that density, fibre structure, and air voids influence thermal conductivity and heat transfer, which provides a mechanism for why denser rock wool can improve insulation performance; however, A-60 compliance must be demonstrated by testing the complete panel assembly, not by density alone. Evidence role: mechanism; source type: paper. Supports: Higher-density rock wool can contribute to slower heat transfer in fire-rated panels, but one-hour A-60 performance depends on the complete tested assembly.. Scope note: This would support the general heat-transfer mechanism, not prove that every 150 kg/m³ marine panel achieves A-60 performance. ↩
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"How to choose the right marine wall panels for marine interior ...", https://magellanmarinetech.com/how-choose-right-marine-wall-panels-for-marine-interior-projects/. Type-approval certificates or classification-society listings for mineral-wool A-60 bulkhead panels can support that tested 50 mm constructions often use rock-wool core densities around 140–160 kg/m³; the IMO FTP Code itself is performance-based and does not prescribe a universal density range. Evidence role: general_support; source type: institution. Supports: The standard rock wool density for A-60 panels is strictly between 140 kg/m³ and 160 kg/m³.. Scope note: This would contextualize common tested designs rather than prove a mandatory global density standard. ↩
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"Are Marine Fire Divisions the Same as Marine Panel Ratings?", https://magellanmarinetech.com/are-marine-fire-divisions-same-as-marine-panel-ratings/. The IMO Fire Test Procedures Code specifies that A-class divisions must prevent the average unexposed-face temperature rise from exceeding 140°C during the rated period, with A-60 requiring the insulation criterion to be maintained for 60 minutes. Evidence role: definition; source type: institution. Supports: To pass the IMO FTP Code test for an A-60 panel, the average temperature rise on the unexposed side must remain below 140°C for 60 minutes.. ↩
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"Determination of Thermal Properties of Mineral Wool Required for ...", https://pmc.ncbi.nlm.nih.gov/articles/PMC10488771/. Studies and technical references on mineral wool report that density influences thermal conductivity and heat transfer, which is relevant to fire-insulation performance in sandwich panels; such evidence supports the mechanism but does not by itself prove that every 120 kg/m³, 50 mm A-60 panel fails the IMO test. Evidence role: mechanism; source type: paper. Supports: A lower-density rock-wool core can allow faster heat transfer through an A-60 panel, increasing the risk of failing the insulation criterion.. Scope note: Supports the heat-transfer rationale, not the specific pass/fail outcome without a matching fire-test report. ↩
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"How to choose the right marine wall panels for marine interior ...", https://magellanmarinetech.com/how-choose-right-marine-wall-panels-for-marine-interior-projects/. Classification-society type approvals and product certificates for 50 mm A-60 mineral-wool panels can document that 150 kg/m³ is a commonly certified core density for this panel class; this evidence would indicate industry practice rather than establish a formal IMO-mandated standard. Evidence role: case_reference; source type: institution. Supports: A 150 kg/m³ rock-wool core is commonly used or certified for 50 mm A-60 panels.. Scope note: May show common certified configurations, but not that all major manufacturers use exactly this density. ↩
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"Hybrid composite board produced from wood and mineral stone ...", https://bioresources.cnr.ncsu.edu/resources/hybrid-composite-board-produced-from-wood-and-mineral-stone-wool-fibers/. A materials or insulation reference should support that mineral/stone wool fibers are inorganic and generally do not absorb moisture from air in the way hygroscopic organic materials do. Evidence role: definition; source type: education. Supports: Stone fibers used in marine rock wool are naturally non-hygroscopic.. Scope note: This supports the material property in general; specific moisture behavior can vary with product density, binder formulation, and surface treatment. ↩
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"Low Formaldehyde Binders for Mineral Wool Insulation: A Review", https://pmc.ncbi.nlm.nih.gov/articles/PMC8995714/. A neutral technical source on mineral wool manufacture should document that water-repellent additives or binders can be introduced during production to reduce liquid-water uptake. Evidence role: mechanism; source type: research. Supports: Factories add hydrophobic binders or water-repellent treatments to rock wool to reduce water penetration.. Scope note: Such sources may describe mineral wool products broadly and may not verify the exact formulation of every marine-grade product. ↩
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"Research on Thermal Insulation Performance and Impact on Indoor ...", https://pmc.ncbi.nlm.nih.gov/articles/PMC10419949/. A building-physics or thermal-insulation source should show that water has substantially higher thermal conductivity than air, explaining why moisture in porous insulation can reduce insulating performance. Evidence role: mechanism; source type: education. Supports: Wet insulation loses thermal performance because water conducts heat more readily than trapped air.. Scope note: This supports the physical mechanism; the magnitude of performance loss in a ship panel depends on moisture content, density, panel design, and operating conditions. ↩
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"Sound transmission class", https://en.wikipedia.org/wiki/Sound_transmission_class. ISO 717-1 defines the single-number rating procedure for airborne sound insulation in buildings and building elements, including the weighted sound reduction index Rw derived from one-third-octave-band laboratory measurements. Evidence role: definition; source type: institution. Supports: ISO 717-1 explains how Rw is determined from laboratory sound insulation measurements.. Scope note: The standard defines the rating method; it does not by itself verify any particular panel’s tested performance. ↩
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"How to choose the right marine wall panels for marine interior ...", https://magellanmarinetech.com/how-choose-right-marine-wall-panels-for-marine-interior-projects/. Laboratory test reports or classification documentation for 50 mm mineral-wool-core marine sandwich panels can support that such panels commonly achieve weighted sound reduction indices in the low-30 dB range. Evidence role: statistic; source type: research. Supports: A standard 50 mm rock wool marine panel typically has an Rw of about 31–33 dB.. Scope note: Rw depends on steel skin thickness, joint design, density, mounting conditions, and test laboratory method, so the cited value should be treated as configuration-specific rather than universal. ↩
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"[PDF] Recent Advances in the Sound Insulation Properties of Bio-based ...", https://bioresources.cnr.ncsu.edu/BioRes_09/BioRes_09_1_1764_Review_b_Zhu_Wu_Recent_Advan_Sound_Transm_Props_Biobased_4744.pdf. Acoustics literature on porous absorbers explains that mineral wool dissipates acoustic energy through viscous and thermal losses as air oscillates within interconnected pores and fibers, converting part of the acoustic energy into heat. Evidence role: mechanism; source type: paper. Supports: Rock wool reduces sound partly by converting acoustic energy into heat through air motion and friction within the porous fiber structure.. Scope note: This mechanism describes sound absorption within porous media; total panel sound reduction also depends on mass, stiffness, panel resonance, sealing, and installation details. ↩
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"[PDF] MSC.337(91) (adopted on 30 November 2012) CODE ON NOISE ...", https://wwwcdn.imo.org/localresources/en/KnowledgeCentre/IndexofIMOResolutions/MSCResolutions/MSC.337(91).pdf. The IMO Code on Noise Levels on Board Ships establishes maximum noise-level criteria for ship spaces and addresses protection of personnel from machinery-space noise, providing regulatory context for higher acoustic insulation near engine rooms. Evidence role: historical_context; source type: institution. Supports: Marine spaces near engine rooms are subject to IMO noise-control requirements, making higher acoustic insulation relevant.. Scope note: The IMO code specifies allowable noise levels in ship spaces rather than prescribing a specific panel Rw value; compliance must be verified by shipboard noise measurements and the full acoustic design. ↩
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"What Is the Purpose and Scope of the IMO FTP Code?", https://magellanmarinetech.com/what-purpose-scope-of-imo-ftp-code/. SOLAS Chapter II-2 and the IMO Fire Test Procedures Code establish fire-resistance classifications for ship divisions, including A-class divisions insulated to prevent excessive temperature rise for specified periods such as 60 minutes; this supports the legal context for using A-60-rated divisions in designated fire boundaries. Evidence role: historical_context; source type: institution. Supports: Maritime safety regulations can require A-60-rated fire divisions in certain ship fire-zone applications.. Scope note: The regulations specify required fire ratings by ship area and boundary type, not that all such panels are necessarily heavy or made with a particular core material. ↩
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"[PDF] Chapter 7 Resistance and Powering of Ships - USNA", https://www.usna.edu/NAOE/_files/documents/Courses/EN400/02.07%20Chapter%207.pdf. Naval architecture references describe how increased vessel displacement generally raises hydrodynamic resistance and required propulsive power, while fixed vessel size and design limits mean greater lightship weight reduces available deadweight for cargo; this supports the stated trade-off between weight, fuel use, and payload. Evidence role: mechanism; source type: education. Supports: Higher ship weight can increase fuel demand and reduce cargo-carrying capacity.. Scope note: This is a general design principle and does not quantify the fuel or cargo effect for the specific panel weights in the article. ↩
