Adhesion Enhancement of Silicone Elastomers and Sealants to Difficult-to-Bond Surfaces

Master Sil Primer 718 is a specially formulated silicone primer for use with Master Sil RTV silicone elastomers and sealants to promote adhesion to various difficult-to-bond substrates such as acrylics, ABS, polycarbonates, polyphenylene oxides, polysulfones, polyesters, styrenics, rigid PVC's, etc. It is a one component, low viscosity colorless liquid which can be applied by such methods as brushing, wiping or dipping. A thin uniform primer coating is recommended for styrene and polycarbonates to prevent crazing or stickiness of such surfaces when applied. A drying time of at least 20 minutes at ambient temperatures is recommended before applying the RTV silicone rubber adhesive/sealant. The primer may be left to dry for up to 24 hours before application of the RTV compound without loss of bonding performance. However, the primed surface must be covered to prevent dirt or contaminant pickup. Master Sil Primer 718 has a shelf life of 6 months when stored in its original unopened container at 25°C (75°F).