Closed cell polyethylene foam cord in 50mm thickness

Used behind sealants and mastics in expansion joints
Temperature range: -70ºC to +90ºC 
Thermal Conductivity: 0.04 w/mK @ 20ºC 
Water vapour transmission: less than 4g/m²/20mm 
Water absorption: less than 1% v/v after 24 hrs 
Total immersion 
Density: 35kg/m³ approx 
Heat shrinkage: after 96 hours @ 80ºC - less than 1%
 Does not rot. Physically and chemically neutral