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New rubber qualification for the igniter adapterKirkhill Rubber Company (KRC) has informed Thiokol Corporation that two raw materials used in the asbestos and silica filled acrylonitrile butadience rubber (NBR) formulation per STW 2621 are no longer available from their vendors. Agerite White (Di-beta-naphthyl-paraphenylene diamine), manufactured by B. F. Goodrich, is an antioxidant used in NBR. This raw material makes up roughly 1-2 percent of the finished product. KRC proposed that this raw material be replaced by Agerite Stalite S (mixture of octylated diphenylamines) distributed by R. T. Vanderbilt Co. Protox-166 zinc oxide, manufactured by Zinc Corporation of America, is an activator currently used in NBR. This material also makes up about 1-2 percent of the finished material. Protox-166 is an American process grade zinc oxide. It is proposed by KRC to replace Protox-166 with Kadox-930C, a French process grade zinc oxide. American process grades have an ASTM minimum purity of 99.0 percent; the French process grades have a minimum purity of 99.5 percent. Previous testing per WTP-0270 has demonstrated that the mechanical and thermal properties of the rubber with the new ingredients are comparable to the 'old' rubber. The test results are reported in TWR-61790. One igniter adapter, Part no. 7U77562-02 serial no. 2 was insulated per ETP-1206 using the new rubber formulation and a modified lay up and cure method to demonstrate that there is no impact on this process. The results of this demonstration are reported.
Document ID
19940022205
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Humpherys, Mark A.
(Thiokol Corp. Brigham City, UT, United States)
Date Acquired
September 6, 2013
Publication Date
January 13, 1994
Subject Category
Nonmetallic Materials
Report/Patent Number
NAS 1.26:193936
TWR-65405
NASA-CR-193936
Accession Number
94N26708
Funding Number(s)
CONTRACT_GRANT: NAS8-38100
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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