The sensitivity of the analytical instruments used in these measurements influence when a chemical is first detected. It is determined by applying the chemical on the glove exterior and measuring the time it takes to detect the chemical on the inside surface. Penetration occurs when the chemical leaks through seams, pinholes and other imperfections in the material: permeation occurs when the chemical diffuses or travels through intact material.īreakthrough time is time it takes a chemical to permeate completely through the material.

Permeation is different from penetration. The higher the permeation rate, the faster the chemical will move through the material. It is measured in a laboratory and is expressed in units like milligrams per square meter per second (or some other per per ). Permeation rate is the rate at which the chemical will move through the material. What is meant by permeation rate, breakthrough time, and degradation? Manufacturers of chemical protective gloves and clothing may also assist their customers in making the appropriate choices. If this information is missing, contact the supplier or manufacturer of the product.

Information specifying the best type of chemical protective material is what should be on the SDS (e.g., neoprene, butyl rubber). Some chemicals will travel through or permeate the glove in a few seconds, while other chemicals may take days or weeks. No one glove material is resistant to all chemicals. No glove material will remain impervious to a specific chemical forever. The phrase commonly found on the Safety Data Sheet (SDS) 'Wear impervious (or impermeable) gloves' has very limited value. Since the clothing is the last line of defense for protecting the skin, care must be taken to ensure it provides the level of protection expected. However, there are often few alternatives available, or an emergency (e.g., a spill) requires their use. Chemical protective clothing should not be considered as a replacement for engineering control methods.

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