The intent of this document is to discuss methods of compatibility testing of glazing components with respect to Polyisobutylene (PIB) primary sealant in an insulating glass unit (IGU). Glazing system components include, but are not limited to, setting blocks, glazing sealants, spacer materials, shims and backer rods. Compatibility testing of the glazing system components may be performed by the component manufacturers, PIB supplier, or a third-party test laboratory.

The Technical Services Division of the National Glass Association (NGA) and the Fenestration & Glazing Industry Alliance (FGIA) have produced this Glass Technical resource solely for informational purposes. This resource was developed by dedicated member volunteers and subject matter experts. This is the original version of this document. It was approved and published in 2023.

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