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Ebonite Rod: Rubber and an Equal Weight of Sulphur, Cured Hours in the Heat, Goodyear 1851
Ebonite is rubber with a great deal of sulphur. Nelson Goodyear's patent (1851) uses about equal weights of the two, far more than for soft rubber, moulded and then cured at 260–275 °F for three to six hours or longer. It comes out hard and stiff.
The picture: ebonite objects (photo by FBQ, Wikimedia Commons, CC BY-SA 3.0).
Intermediate
1 day
Instructions
1
1
Weigh equal parts
Weigh equal parts
Weigh the rubber and the sulphur, about equal parts by weight. Much less sulphur will not make it hard.
Materials for this step:
Smoked Rubber Sheet500 g
Sulfur Powder500 gTools needed:
Balance Scale2
2
Work the sulphur in
Work the sulphur in
Mix the sulphur into the rubber the usual way rubber is compounded: on the rubber mill, until the sulphur is spread evenly through.
Tools needed:
Two-Roll Rubber Mill3
3
Mould the rod
Mould the rod
Press the compound firmly into a tube to shape it as a rod.
Tools needed:
Steel Tube 12mm4
4
Cure it
Cure it
Heat it to 260–275 °F (about 127–135 °C) and hold it there three to six hours, or longer. Let it cool and push out the hard rod.
Tools needed:
Oven
ThermometerMaterials
2- 500 gPlaceholder
- 500 gPlaceholder
Tools Required
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