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Polyurethane
GD-677NA is a two-part polyurethane designed to be used as a secondary
edge sealant for dual seal insulating glass units. It provides high stability
and elasticity and low water vapor permeability. This formula is mercury-free
for use in North America. Superior MVT rates are obtained by using ADCO PIB
primary sealants in conjunction with GD-677NA. GD-677HM is designed for use
with heat mirror IG units.
GD-677NA has good processing characteristics for both automatic and manual sealing systems. Click here for glazing recommendations for GD-677NA. Advantages of using GD-677NA polyurethane-based sealant include:
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