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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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Problem Solving Through E-Mails with John Woon Latex Consultants Is Possible
可以通过电子邮件与JW乳胶顾问来解决问题

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Thursday, April 08, 2010

Test For Freeze/Thaw Stability Of Polyvinyl Acetate Latex

Manufacturer: We intend to export our products (coatings and adhesives) based on Polyvinyl acetate emulsion to Europe and Middle East. Please suggest some simple test methods we could use to assess the Freeze/Thaw stability and high temperature stability of our products.
John Woon (Senior Latex Consultant): I suggest you try the following:

1) Freeze/Thaw Stability
Fill up a glass bottle (3/4 full) with your Polyvinyl acetate emulsion (or rather latex) and subject the bottle to 10 cycles of, say, 18 hours freezing at - 20ºC in a refrigerator followed by 6 hours thawing at 20 to 30ºC.

The latex would be considered unstable if there are changes in viscosity and signs of agglomeration.

2) High Temperature Stability
Subject the 3/4 filled glass bottle to 22 cycles of heating at 60ºC followed by 2 hours at room temperature.

The latex is considered to have failed the test if there is an increase in viscosity. For some latex, the viscosity might have permanently reduced viscosity on gentle stirring.


You are at the site for answers and solutions to all your problems in natural rubber latex processing and manufacturing of industrial, household and medical gloves, condoms, catheters, baby teats and baby pacifiers, toy balloons, latex foam products, latex threads etc.

1 Comments:

Blogger Nitrile Gloves said...

Many people are turning to powerless 18" long latex gloves. It is also possible for you to use non-latex gloves, but they are not going to provide you with the sensitivity that the elbow length latex exam and surgical glove would provide. Even so, it is a viable solution, should you develop a latex sensitivity.

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