... units Export to 20 country CCC,meet EN/BS/ASTM Triple Double Glazing Glass Unit DOUBLE GLAZING glass unit is made ... : Butyl used for the first sealing, Kommerling polysulfide rubber or silicon structural sealants should be chosen according to purpose) Characteristics Optical ... . CCC certificate, conform to EN1279 BS5713 ASTM E546 standards 3. Triple layer and double silver low-e DOUBLE GLAZING glass, U ...