K-FLEX® INSUL-SHEET® is an NBR/PVC based closed cell, flexible elastomeric foam insulation. It is environmentally friendly as it is free of CFCs, HFCs, HCFCs, PBDEs,
formaldehyde and fibers. An EPA-registered antimicrobial agent is incorporated into the product providing additional protection against mold, fungal and bacterial growth. It is UL GREENGUARD® Gold Certified for low VOC emissions.
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| Physical Properties | K-Flex Insul-Sheet | Test Methods |
|---|---|---|
| Main Composition | Flame-retarded NBR/PVC-based elastomeric foam | |
| Thermal Conductivity (K) Btu-in/hr-Ft2-°F (W/mK) | 90°F (32°C) Mean Temp = 0.258 (0.0372) 75°F (24°C) Mean Temp = 0.245 (0.0353) 32°F (0°C) Mean Temp = 0.235 (0.0339) | ASTM C177 |
| Density | 3-6 lb/ft3 | ASTM D1667 |
| Operating Temperature Range | -40°F (-40°C) to +200°F (93°C) | ASTM C534 |
| Water Vapor Permeability (Dry Cup) | <0.01 perm-in | ASTM E96 |
| Water Absorption (Volume Change) | 0% | ASTM C209 |
| Flame Spread / Smoke Development (up to 2” wall) | <25/50 | ASTM E84 |
| Flammability | Self-Extinguishing | ASTM D635 |
| Dimensional Stability | <7% Linear Shrinkage | ASTM C534 |
| Hot Surface Performance (250°F for 96 hours) | No Cracking or Delamination | ASTM C411 |
| Ozone Resistance | Pass | ASTM D1171 |
| Odor Emissions | No Objectionable Odor | ASTM C1304 |
| Chemical/Solvent/Oil/Grease Resistance | Good | Compatibility Data Available on Request |
| Flexibility | Excellent Pass: Cold Crack Test at -40°F (-40°C) | ASTM C534 ASTM D1056 |
| Mildew Growth Resistance/Air Erosion | Pass | UL 181, ASTM G21 |
| Corrosion Risk | pH neutral: 6.6±0.04 | DIN 1988 |
| Leachable Chlorides | <0.05% water-soluble chloride ions | DIN 1988 |
| UV / Weather Resistance1 | Good | ASTM G90 |
| Sound Transmission Class (1”) | 13 | ASTM E90 |
*For applications below -40°F (-40°C), contact K-FLEX technical support.
1 Outdoor applications should be protected with an approved K-FLEX® coating or cladding for optimum performance.