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JW Latex Consultants (and Rubber Consultants,乳胶顾问) offer solutions to your problems in Natural Rubber latex and Synthetic Rubber latex processing and the manufacturing of latex products (condoms, catheters, medical gloves, baby teats and soothers, toy balloons etc) Quick answers through e-mails are possible at reasonable cost.

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Thursday, November 14, 2013

Freeze-Thaw Stability of Latex Compounds

Manufacturer: We are manufacturing synthetic latex based coating compounds for EU markets. Recently we have had complaints about the Freeze-Thaw stability of our products. Can you please suggest a good but easy method to measure this? Would appreciate if you could advise us on how to improve freeze-thaw stability.

John Woon (Senior Latex Consultant): You can use the following method:

1) Fill up a glass bottle (of capacity of about 250 gram) with the latex compound to three-quarter full.
2) Subject the bottle to 10 cycles of 18 hours freezing at - 20°C followed by 6 hours thawing at room temperature.
3) Examine the sample for signs of gelling and precipitation (coagulation).

If the test confirms that the compound has poor resistance to freeze/thaw, proceed to do the following:

1) Add ethylene glycol at 1 to 2% into a fresh sample of the latex compound and stir gently for 1 hour.
2) Repeat the freeze-thaw test.

If ethylene glycol cannot work, please let me know and I would suggest other alternatives.











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