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Marine Rock Wool and Glass Wool: Performance Comparison and System Selection

Publish Time: 28 April 2026

In shipbuilding and offshore engineering, fire resistance, thermal insulation and noise reduction are core demands for cabin and pipeline design. Marine rock wool and marine glass wool are two mainstream inorganic insulation & sound-absorbing materials, widely used in cabin partitions, accommodation areas, equipment rooms, ventilation ducts and pipeline insulation.
With differences in fire rating, temperature resistance, weight and cost, scientific selection not only meets IMO regulations and classification society standards, but also improves construction efficiency and reduces vessel energy consumption.

1. Marine Rock Wool: High-Strength Fireproof for High-Temperature Conditions

Made from basalt and natural ore, marine rock wool is Class A non-combustible.
Key advantages:
  • Excellent fire resistance to meet A60, H-grade marine fire division standards;
  • High temperature resistance and compressive strength, no structural collapse;
  • Salt fog corrosion resistance and long service life in marine environments;
  • High density for better sound insulation and shock resistance.
Best for: Fire bulkheads, deck partitions, high-temperature flues, power equipment areas and offshore fire protection systems.

2. Marine Glass Wool: Lightweight & Sound-Absorbing for Cabin Comfort

Marine glass wool is lightweight and flexible with fine fiber structure.
Key advantages:
  • Light weight to reduce ship load, ideal for lightweight vessel design;
  • Outstanding sound absorption to improve accommodation comfort;
  • Stable thermal insulation performance for medium & low temperature;
  • Easy cutting and installation, lower construction cost.
Best for: Crew cabins, corridors, HVAC ducts, cold pipelines and superstructure insulation.

3. Performance Comparison

  • Fire Performance: Rock Wool > Glass Wool
  • Temperature Resistance: Rock Wool for high temperature; Glass Wool for medium-low temperature
  • Mechanical Strength: Rock Wool with high compression resistance
  • Core Function: Rock Wool — fireproof & structural protection; Glass Wool — thermal insulation & noise reduction

4. Selection Guide

  • Choose Marine Rock Wool for high fire rating and high-temperature protection.
  • Choose Marine Glass Wool for weight reduction, noise control and cost control.
  • Combined application: rock wool for fire structures, glass wool for accommodation areas.
All products comply with IMO FTP Code to ensure global navigation compliance.

Conclusion

HMWool provides full-series marine rock wool and glass wool with complete marine certifications. We deliver one-stop fireproof, thermal and acoustic solutions for various ships and offshore platforms.