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Heil and Esch · Public domain (1909)
Rubber Stoppers: Pará Rubber with Ceresine, Moulded and Cured (Heil & Esch 1909)
Laboratory rubber stoppers from a 1909 rubber factory's book of mixings: Pará rubber with ceresine wax, sulphur and magnesia, run out as a cord, cut to weight, pressed into moulds and cured.
Source: Heil & Esch, The Manufacture of Rubber Goods (1909), mixing No. 34 (p. 108) and the stopper method (p. 135). They give no cure time or temperature. Using smoked ball rubber as their Pará, and the mill, clamps and steam vessel, are ours. Picture: their page of mixings.
Intermediate
1 day
Instructions
1
1
Weigh mixing No. 34
Weigh mixing No. 34
Weigh out 10,000 g Pará rubber, 2,000 g ceresine, 1,000 g sulphur and 100 g calcined magnesia (magnesia usta).
Materials for this step:
Smoked Rubber Ball10000 g
Ceresine Wax2000 g
Sulfur Powder1000 g
Magnesium Oxide100 gTools needed:
Balance Scale2
2
Mix on the rolls
Mix on the rolls
Work the rubber on the mixing rolls and work the ceresine, sulphur and magnesia into it until the mixing is even.
Tools needed:
Two-Roll Rubber Mill3
3
Run a cord on the tube machine
Run a cord on the tube machine
Run the mixing through the tube machine as a cord of a size to suit the stoppers. It must be free from air bubbles, or the stoppers will be faulty after curing.
Tools needed:
Rubber Tube Machine4
4
Cut pieces to weight
Cut pieces to weight
Cut the cord into pieces of the exact weight of one stopper plus 2 or 3 per cent, for what squeezes out of the mould.
Tools needed:
Craft KnifeBalance Scale5
5
Press into moulds and clamp
Press into moulds and clamp
Press each piece into a mould and clamp the small moulds very tightly in iron clips.
Tools needed:
Vulcanizing Mould
C-Clamp6
6
Cure in steam
Cure in steam
Cure the clamped moulds in a steam heater (Heil & Esch also name the sulphur bath). They give no time or temperature for stoppers; then open the moulds and take out the stoppers.
Tools needed:
Benchtop AutoclaveVulcanizing MouldMaterials
4- 10000 gPlaceholder
- 2000 gPlaceholder
- 1000 gPlaceholder
- 100 gPlaceholder
Tools Required
7- Placeholder
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