Melamine is commonly used in coatings and laminates, wood adhesives, fabric coatings, ceiling tiles and flame retardants.
CNN: Almost 13,000 Chinese children sickened by tainted milk
Melamine, an industrial chemical used in plastics and adhesives, mimics the presence of protein in lab tests.
Most of those sickened as a result of the adulteration were babies fed formula that contained melamine.
Health experts say ingesting melamine can lead to kidney stones, urinary tract ulcers, and eye and skin irritation.
CNN: Almost 13,000 Chinese children sickened by tainted milk
Testing by Sanlu found tripolycyanamide, also known as melamine, in 700 tons of its product, the news agency reported.
Public concerns also remains over milk products, after a high-profile scandal involving the use of melamine in baby milk formula.
There have been recent reports of melamine-laced products being discovered.
Officials said the team is concentrating on more than the two companies believed to have exported the melamine in wheat flour mislabeled as wheat gluten and rice protein concentrate.
Meanwhile, Hong Kong's Center for Food Safety announced Sunday that a sample of Nestle Dairy Farm Pure Milk, sold in one-liter packs for catering use only, had tested positive for melamine.
CNN: Almost 13,000 Chinese children sickened by tainted milk
As part of the FDA's domestic protein surveillance assignment, 63 samples of protein from Arizona, California, Connecticut, New Hampshire, Iowa and Minnesota have not tested positive for melamine yet, but 23 of those test results are pending.
"Following press reports in Hong Kong earlier today claiming that traces of melamine had been found in a Nestle growing up milk, Nestle is confident that none of its products in China is made from milk adulterated with melamine, " the company said.
CNN: Almost 13,000 Chinese children sickened by tainted milk
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