TECHNIQUE OF VULCANIZING SYNTHETIC RUBBER
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THEHE repair, by vulcanizing, of inner tubes made from synthetic rubber, calls for somewhat different treatment from that practised with tubes made from straight rubber. The synthetic material requires a larger bonding area and, further, it does not respond to being " roughed up " so readily as does natural rubber. If synthetic rubber he in any way harshly treated it will heat up-and tear.
In connection with the correct treatment of synthetic-rubber inner tubes, Harvey Frost and Co., Ltd., Bishop's Stortford, has issued a sheet of special instructions which, if closely followed, should help materially in solving many of the difficulties which may, hitherto, have been experienced.
Here, however, are a few painters which operatives should observe;—Do not allow the pressure pads to press on the folded edges of synthetic tubes; avoid applying excessive screw pressure; keep to the vulcanizing time-table; do not, at any time, stretch a synthetic tube and, in particular, do not attempt to stretch a repair when hot; after removing the tube from the vulcanizer allow it to cool before examining and testing; it is recommended' that the damaged portion of the tube should be immersed in water immediately after vulcanizing.