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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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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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Wednesday, January 14, 2009

Significance of Stereoregularity of Rubber

Student: Please explain the significance of "stereoregularity" of rubber molecules.

John Woon (Senior Latex Consultant): Stereoregularity indicates the ability of the long-chain molecules to crystallize. This is one reason why natural rubber inherently has high tensile strength compared to some synthetic elastomers since the the stereoregular cis-1,4-polyisoprene rubber molecules tend to undergo crystallization when the rubber is being stretched (strain-induced crystallization)

However stereoregularity has a drawback i.e. the rubber molecules also undergoes crystallization on storage albeit at a very much lower rate. This results in undesirable stiffening of the rubber when exposed to low temperatures. Of course careful design of vulcanization recipes to deliberately introducing cyclic sulphidic cross-linkings, could minimize this problem.


Tuesday, January 06, 2009

Thailand May Purchase 200,000 Tons of Rubber to Reduce Supply

Thailand -- According to an article in bloomberg.net, "Thailand, the biggest rubber exporter, may purchase as much as 200,000 metric tons of the commodity from growers and keep it in storage to reduce supply after prices more than halved last year. "The aim is to draw 100,000 or 200,000 tons from the market," Somchai Charnnarongkul, director-general of the farm ministry's Department of Agriculture, said in a phone interview today.

"The plan would be proposed to the Cabinet next week." Global recession has pared demand for car tires, undermining efforts by Thailand, Indonesia and Malaysia, the world's biggest producers, last year to bolster rubber prices by trimming output.

The raw material tumbled 56 percent in 2008, the biggest slump in at least 17 years. The farm ministry will seek 4 billion baht ($114.8 million) to fund the price-support plan, Somchai said. The government will provide funds for farmers to store the rubber in warehouses until prices rise to attractive levels, Prime Minister Abhisit Vejjajiva said in an interview on Dec. 17. Thailand may ship 2.6 million tons this year, compared with 2.75 million in 2008, as producers plan to pare production from 3 million tons, according to the Thai Rubber Association.

Monday, January 05, 2009

Biodegradable Wetting Agent


Manufacturer: We are looking for a cost effective wetting agent for our dipping processes that is biodegradable. Can you please suggest one?

John Woon (Senior Latex Consultant): I suggest you try a non-ionic of the type based on ethylene oxide/fatty alcohol condensates with 16 to 20 moles of EO. You should select one with a Cloud Point just below the temperature of your composite or mixes at which most non-ionic surfactants would perform best.

Prepare a 10 or 20% solution of the wetting agent before use. It is advisable to determine the surface tension (dyne/cm) of a 0.1% solution. This should be around 37.0.
It goes without saying that the wetting agent you select should also have a low tendency to foam.

Saturday, January 03, 2009

Medical Glove Demand for 2009 Remains Strong

Whilst the world enters the worst economic crisis of the century, with rapid increases in layoffs and cutbacks (including bankruptcies) by companies, and major stock market losses and market volatility, the medical glove industry sees a bright 2009 with the growth of the glove demand remaining very positive at 8 to 10% per year.

Historically, the medical glove industry is recession proof due to the ever growing medical market that demands strict regulatory health care standards.

Malaysia remains the major player in the world supply of medical gloves, having captured about 60% of the global market.

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What has the bouncing ball to do with tyres?

Latex Gloves Educational Articles from the Malaysian Rubber Export Promotion Council

How do you select your medical gloves?

Rubber Chemicals: Carcinogenicity, Mutagenicity, Clastogenicity.

Why is Compression Set measurement important?

Assessment of Latex Stability

Joule Effect

Poor Flocking Quality Of Household Gloves

Creaming of Latex

What is Vulcanization?

History of Latex Dipped Products

Applications of Prevulcanized Latex

Defoamer Creating Havoc in Glove Factory

Problems With Milling Rubber Chemicals

Medical Gloves From Guayule Latex

Introduction to SMG Gloves

 

 

Click on The Following Links to Read More Articles:

[Advantages of Vulcanization] [Applications of PV Latex] [Bacteria and Latex] [Chemical Toxicity] [Cross-Linking Density] [Biodegradability] [Black Articles] [Blooming] [Bouncing Ball] [Compression Set] [Condoms] [Creaming] [Defoamer] [FDA] [Fatty Acid Soaps] [Flame Retardant] [Flocking] [Food Packaging] [Glove Demand] [Glove Selection] [Guayule Latex] [History of Gloves] [Joul Effect] [Latex Stability] [Latex Thread] [Milling Problem] [MREPC Articles] [Nano Polymer Particles] [Nano ZnO] [Polychloroprene] [REACH] [SMG] [Storage Hardening] [Vulcanization] [Vytex] [Yulex]

Disclaimer:
The information and data contained in this site are believed to be accurate and reliable. However it is the responsibility of the visitors and readers to satisfy themselves that the information is workable under their own processing conditions. Hence the owners of this site make no warranties concerning the suitability of the information given in this site.

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