CHT Silcoset 105 & Catalyst 28 Potting Compound
Product notice - CHT is the new name for ACC Silicones. For further information on this change please click here.
This is a two-part, pourable, liquid silicone rubber which with the addition of a curing agent will cure at room temperature to form a resilient silicone rubber. It remains flexible over a wide temperature range.
Silcoset 105 possesses excellent weathering resistance, is resistant to oxidation and to many oils and chemicals and exhibits very good electrical properties. Silcoset is approved under the UK Ministry of Defence Air Materials Specification DTD 900. The approval reference numbers are DTD 900/4721 and AFS 1980.
- Flexible from - 60 to +220°C
- Aerospace approved
- Good electrical properties
- Resistance to many chemicals
- Appearance - Viscous Liquid
- Colour - White
- SG - 1.37
- Viscosity - 10,000
- Mixing Ratio - 100:1
- Cure Type - Condensation
- Rheology - Viscous Liquid
- Self-bonding - No
Mixing: The base rubber must be mixed thoroughly with CA28 to produce a uniformly cured product. Mixing can be carried out mechanically or by hand, but care should be taken to avoid trapping air in the mixture since this can cause voids in the cured rubber.
Deaeration: For applications where such voids are undesirable the mixture should be deaerated under reduced pressure before use. The time and pressure required for deaeration depends on the quantity of the base liquid being used. As a guide, 150 g of base can be deaerated within 5-10 minutes at a pressure of 30 to 50 mbar. Containers should be only two-thirds full to prevent overflow during the initial stages of deaeration.
Curing: The curing process begins, without exotherm, immediately when the liquid and curing agent are mixed together. Depending on the amount and type of curing agent used, the cure times may vary from less than thirty minutes and up to 24 hours. There is no significant change in the physical properties of the final rubber when the curing agent concentration is varied within the recommended limits. (0.25 - 1 part of CA28 to 100 parts of Silcoset by weight.) Alternative bulked catalysts are available and details are given on the individual technical data sheets.
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