Edgetherm® PIB H-1

A high viscosity, high strength, 100% solids sealant based on polyisobutylene polymer formulated to impart reinforcement, resist degradation from ultraviolet light, and provide low moisture permeability.


  • Easy application and handling of coated spacer bars.
  • High viscosity formula resists shearing in large, heavy lites of glass.
  • Excellent adhesion to glass and metal through a wide temperature range.
  • Low moisture vapor transmission rate.
  • Non-fogging (100% solids).
  • Consistent quality.
  • Retains flexibility through a wide temperature range to compensate for thermal movement of the insulating glass unit.
  • Resists degradation from ultraviolet light and oxidation.
  • Available in bulk (slug form: 7.5”D x 9.5” H, 15.5 lb/7 kg) for application by various type extruders.

EdgeTherm PIB-H1 is used as the primary seal on insulating glass units while providing the main moisture vapor seal between the glass and metal spacer. EdgeTherm PIB-H1 must be used with a secondary seal designed to provide structural strength.

Performance Norm
Moisture Vapor Transmission Rate
0.45 g/m²/d, 0.060” fi lm, 100° F,
100% RH
ASTM F 1249
Volatile Fogging
ASTM 2189
Shear Resistance @ 2 psi
Time to displace 0.2” 28 minutes
Time to displace 1.0” 75 minutes
Weight per Gallon (Specific Gravity)
Black: 9.34 lb/U.S. gal (1.12 g/cc)
Hardness (Consistency)
40 dmm
Note: The foregoing information is published as general information only. The listed properties and performance characteristics are approximate value and are not part of the product specifi cation.