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Silicone Rubber Compound: Dimethyl Silicone Oil Gelled with Ferric Oxide, Agens 1948
Dimethyl silicone oil mixed with three-quarters its weight of red ferric oxide and a little aluminium chloride, heated to 130 °C, thins and then sets to a solid mass; milled on warm rubber rolls it becomes a silicone rubber compound ready to mould or extrude (Agens, General Electric, US 2,448,756, 1948). Cured, it stretches over 100 % and stays flexible at −60 °C.
The picture: our drawing of the beaker, the mill and the sheet.
高级
A day
说明
1
1
Weigh the mix
Weigh the mix
To 400 g silicone oil add 300 g ferric oxide (75 % of the oil) and 5 g anhydrous aluminium chloride (1.25 %). Stir it smooth. Keep the chloride dry; it fumes in damp air.
此步骤所需材料：
二甲基硅油400 克
细红抛光粉300 克所需工具：
氯化铝（无水）
硼硅玻璃烧杯
搅拌器
数字厨房秤
橡胶手套2
2
Heat to 130 °C
Heat to 130 °C
Heat the mix to 130 °C. It first gets thinner, then thickens fast until the whole mass is solid.
所需工具：
电热板
温度计硼硅玻璃烧杯3
3
Mill and sheet
Mill and sheet
Work the mass on rubber rolls at 125 °C for about half an hour and take it off as a sheet. This is the compound.
所需工具：
双辊开炼机温度计4
4
Test a piece
Test a piece
Agens's test: press a sheet about 1.3 mm thick between platens at 150 °C for ten minutes, then 15 minutes in an oven at 200 °C. It should stretch over twice its length.
所需工具：
加热模压机
退火炉5
5
The mix
The mix
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