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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.
Advanced
A day
Instructions
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.
Materials for this step:
Dimethyl Silicone Oil400 g
Fine Rouge Powder300 gTools needed:
Aluminium Chloride (anhydrous)
Borosilicate Beaker
Stirrer
Digital Kitchen Scale
Rubber Gloves2
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.
Tools needed:
Hot Plate
ThermometerBorosilicate Beaker3
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.
Tools needed:
Two-Roll Rubber MillThermometer4
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.
Tools needed:
Heated Compression Moulding Press
Annealing Oven5
5
The mix
The mix
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Materials
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- 300 gPlaceholder
Tools Required
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