2-Part RTV Silicones

Generally, two-part RTV silicone products do not have adhesion promoters in their formulation and consequently have minimal adhesion to substrates. Two-part products have adhesion that is usually acceptable for potting or encapsulating applications but is not sufficient for many sealing or adhering applications. If better adhesion is required, a primer can be used.

1-Part RTV Silicones

One-part RTV silicone products have adhesion promoters in their formulation and co nsequently have good adhesion to a variety of substrates. For 1-part products, it is generally suggested that testing be done without a primer first and if adhesion is acceptable then no primer is required.

Available Primers

Product Code	Description and MIL Spec	Spec. Grav.	Solids Content	Solvents	Dry Time (min.)	Use with:
SS4004P	General purpose, pink in color to help identify areas where primer has been applied. Meets MIL-A-46106B, MIL-A-46146B, MIL-S-23586E.	0.85	15%	Acetone Isopropanol Xylene N-butanol	30	1 & 2 Part Conden- sation
SS4044P	General purpose, clear, can be used in food contact applications where FDA regulations apply. Meets MIL-A-46106B, MIL-A-46146A, MIL-A-46146B, MIL-S-23586E.	0.85	15%	Acetone Isopropanol Xylene N-butanol	30	1 & 2 Part Conden- sation
SS4120	Clear, most suitable when optical clarity is required, can be used in food contact applications where FDA regulations apply. Meets MIL-A-46106B, MIL-A-46146B.	0.82	3%	Ethanol Methanol	30	1 & 2 Part Addition
SS4155	General purpose, blue, forms chalky white haze when dry	0.85	10%	Mineral Spirits	30	All
SS4179	Most suitable for plastic substrates, can be used in food contact applications where FDA regulations apply	0.98	6%	Ethyl acetate Toluene Methanol	15	1 Part Conden- sation