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Chemical properties of silicone rubber hose products
In the production of silicon rubber hose products is necessary to understand the chemical properties, chemical properties of sharing the following Xiaobian finishing under silicon hose products to you.
1 heating loss rate
(1) standard: A. = 0.2% (at 200 c /4HRS heating loss after)
B. is less than or equal to 1% (with 200 DEG C /24HRS heating loss after)
(2) test: products will be placed in a drying box for 30 minutes, then remove the silicone tube, analytical balance to take the test before the tablet weight products, W1 products will be put into the oven temperature is 200+/-5 DEG C in baking 4 hours or 24 hours, then the product out put in a drying box placed 30 minutes later with the analytical balance take the weight of W2, the calculation of (W1-W2) /W1*100 percent of the value.
2 extraction rate of weight loss
(1) standard: less than or equal to 3.5%
(2) testing method: selects some representative key, clipping about 0.5g of sample, and then cut into 0.005-0.01g small, with its accurate analysis of balance weight is W1, the sample is placed in the extractor and adding the ISO Bing alcohol (IPA) were proposed for 2 hours, then remove the sample and then into the oven temperature 100 C within half an hour after the removal of baking, put in a drying box for cooling half hours says its accurate calculation of gross weight is W2, (W1-W2) /W1*100 percent of the value.
3 low molecular content
(1) standard: D3-D10 = 300PPM
(2) testing method: selects the representative key 1.00+/-0.002g samples, the cut about particles as small as 2mm, put the bottle, then 20ML CCL4 solution was injected into the vial, add 20UL of the internal standard (CH3 (CH2 9CH3 strain 16-24HRS, stored, used chromatography analyzer to measure the amount of D3-D10.
This article from the Shenzhen City Qiyu Silicone Rubber Co., Ltd.: http://www.szhcty.com/news_v.asp? Id=258
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