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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Send Your Enquiry and Orders To: woonsungliang@yahoo.com.sg
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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Low ZOT Latex
Manufacturer: We
have been having latex stability problem after compounding for months and was advised by some experts to use "High ZOT" latex. Can you please tell us more about ZOT?
John Woon (Senior Latex Consultant): Sometimes the common test such as MST is not very useful when accessing the suitability of the latex for production use after compounding with curatives, particularly, ZnO.
"ZOT" refers to a test on the degree of increase in viscosity of the latex compound after adding a given amount of ZnO, sometimes also referred to as "Zinc Oxide Thickening Test".
Although there is a British Standard Zinc Stability test (ZST) you can easily design your own ZOT test for your own purpose by adding some amount of ZnO (depending on the level you used in your compound formulation) followed by stirring and allowing to stand for a given period at room temperature and also at elevated temperatures (e.g. 45 to 60C) before measuring the viscosity using Brookfield viscometer.
Low ZOT can be overcome by proper use of stabilisers and alkali.
Merry Christmas and A Happy New Year!
We would like to wish all our customers, clients and students "A Very Merry Christmas and a Happy New year!
Ozone Cracking of Rubber Products
Manufacturer: We have recently received complaint from one of our customers indicating that our products made from natural rubber had poor resistance to ozone attack. Please tell us more about this.
John Woon (Senior Latex Consultant): Symptoms of ozone attack include signs of a few deep cracks or patches of very small cracks. These usually occur at right angles to the direction of the stress to which the rubber products are being exposed to. Therefore your products must have been stressed during it's service life. Unstressed rubber is attacked at a very much slower rate, if there is any.
Ozone is universally present in atmosphere. Ozone is being created by oxygen in the air by sunlight (UV light) and also high voltage discharge.
I suggest you try adding antiozonant and wax to your compound failing which you should look into switching your base rubber to polychloroprene.