
Trandar Rock wool S75
Trandar dBphon S75 Insulation
Fireproof, Soundproof, Heat-resistant
(40K)

Trandar dBphon S75
Trandar Rockwool dBphon S75 Insulation (Fireproof, Soundproof, Heat-resistant)
Trandar dBphon is a high-quality insulation manufactured from Basalt Rock or natural volcanic rock, which is a non-combustible material with a melting point exceeding 1,000°C. It is ideal for fire, thermal, and acoustic insulation applications in buildings. Trandar dBphon insulation is developed from Inorganic Wool fibers featuring High Airflow Resistance, which enhances sound absorption and reduces sound transmission more effectively than other fiber types. The material is fire-retardant, non-heat-radiating, and features Moisture Resistant properties to minimize moisture absorption and maintain long-term insulation performance. It is health-safe and free from asbestos, a known carcinogen and respiratory hazard. Additionally, it is free from CFCs, HFCs, and HCFCs during production and offers resistance to mold growth.
Furthermore, Trandar dBphon features Slumping Protection and Sag-Free properties, preventing vertical sagging and settling, extending lifespan, and continuously maintaining fire, acoustic, and thermal insulation performance. Trandar dBphon can be installed in wall systems, ceiling systems, and roof systems. When installed with Trandar Acoustic products, it helps spaces meet Noise Criteria (NC) standards, a crucial benchmark in designing various room types to create a quiet, comfortable, and safe environment for occupants.
Key Features
- Fire, sound, and thermal insulation
- Non-combustible material
- High Airflow Resistance value enhances sound absorption efficiency
- Moisture Resistant, reducing moisture absorption
- Non-flammable, does not radiate heat
- Health-safe, asbestos-free
- Resistant to mold growth
- Easy to install, compatible with wall and ceiling framing
Product Dimensions
1200 x 600 x 75 mm.
Packed 4 pieces / pack




Technical Data
Fire Resistant Non-combustible: Made from 100% natural basalt rock, preventing fire propagation and fuel source creation High Heat Resistance: Melting point exceeds 250°C, serving as an exceptional fire barrier Flame Arresting: Does not radiate heat or propagate flames, increasing evacuation time for occupants
No Sagging: Sag-Free technology maintains insulation form, preventing it from collapsing to the bottom of the wall Maintains full-area fire barrier performance throughout its service life | 
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Water Repellent Technology
Moisture Resistant: Features Hydrophobic properties to repel water and reduce moisture absorption Consistent Performance: Non-water-absorbent insulation does not sag and provides excellent long-term thermal insulation Clean and Safe: Inhibits mold growth, improving indoor air quality Eco-Friendly: Clean manufacturing process, free from ozone-depleting substances (CFCs/HFCs) | 
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High Airflow Technology Inorganic Fiber Structure: Special fibers arranged via spinning technology to provide High Airflow Resistance Excellent Sound Absorption: High resistance effectively reduces the energy of passing sound waves Stops Echoes: Converts sound energy into heat within the micro-cavities of the fibers, preventing sound transmission or reflection | ![]() 
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Anti-Slumping Technology Recovery and Shape Retention Properties This special additive gives the insulation excellent "spring-back" resilience The insulation will not slump or pool at the bottom of the wall (Anti-Settling) throughout its lifespan, which is crucial for maintaining full-area acoustic and thermal insulation performance without gaps at the top of the wall | 
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| Features | Specifications | Test Standards | Benefits |
| Sound Absorption | NRC = 0.85 (dBphon S50)NRC = 1.0 (dBphon S75) | ASTM C423-01 | Reduces reverberation and effectively minimizes echo |
| Fire Protection | Class A (Flame Spread = 0, Smoke Developed = 5)Non–Combustible | ASTM E84 | Flame-retardant, non-toxic smoke, fire-resistant |
| Thermal Conductivity | K = 0.036 W/mK 20°C | BS 476 Part 4 | Excellent thermal insulation |
| Thermal Resistance | R = 1.389 m2K/W (dBphon S50)R = 2.083 m2K/W (dBphon S75) | ASTM C518 | Energy-saving and reduces air conditioning load |
| Maximum Temperature Resistance | 250°C / 482°F | - | Suitable for high-temperature applications |
| Moisture Resistance | 0.01% by volume | ASTM C1104 | Moisture resistant |
| Fungus Resistance | No Growth | ASTM C1338-08NIOSH, TISTR | Prevents mold growth |
| Health and Safety | Non–AsbestosClass 3 | IARC | Non-carcinogenic and safe product Harmless to health (Health & Hazardous) |
| SAC |
| Thickness | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz | NRC Value |
| 50 mm. | 0.20 | 0.62 | 0.62 | 0.88 | 0.97 | 0.89 | 0.85 |
| 75 mm. | 0.52 | 1.02 | 1.02 | 1.00 | 0.96 | 10.95 | 1.00 |