REINFORCED HIGH TEMPERATURE ELASTOMERS.
Abstract
The use of certain grades of fibrous talc has been found to improve the high temperature tensile strength of silicone rubbers, when used with modified or unmodified silica. The improvement has been due to both the fibrous nature of the talc as well as the heat-stabiliz ing effect of the iron oxide present in talc. Optimum loading concentration has been determined. Modification of the fibrous talc by chlorosilanes has been found to be successful, and initial results from the use of such modified talc and the trimetsilyl (TMS) modified silica result in improving high tensile strength on aging at 500 F and testing at 500 F. It is therefore possible now to achieve tensile of 460 psi for a silicane rubber at 500 F. after aging for 48 hrs at 500 F. When a filler modified with trimethylchlorosilane and vinylchlorosilane was used, the elongation at high temperature was improved. For example, a 35 parts of this filler gave a rubber having 290% elongation at 500 F after 48 hr aging at 500 F, when milled with a high molecular weight dimethylsilicone polymer. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1963
- Accession Number
- AD0417400
Entities
People
- B.d. Halpern
- K.c. Tsou
- R.n. Boldey