Like most chemicals, SLS can be irritating to the eye when delivered neat as a raw material or at high concentrations. At concentrations <0.1% (w/w), SLS is nonirritating to the eyes of laboratory animals.1 For this reason, it is imperative for consumer product manufacturers to test finished products for ocular irritation. The U.S. Consumer Product Safety Commission (CPSC;16 C.F.R. §) requires consumer product manufacturers to perform irritation tests that appropriately characterize the ocular toxicity of the product.12 Manufacturers are required to label the product with the appropriate warnings and first aid information according to the mandatory labeling requirements of the CPSC.12
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SLS is cited as causing severe eye damage and blindness.13 These claims typically point to a study published by Green et al.14 in the journal Lens and Eye Toxicity Research. The study shows that after the occurrence of physical or chemical damage to the eye, corneal exposure to a high concentration of SLS can result in a slowed healing process. The findings presented by Green et al.14 do not suggest that ocular exposure to consumer products containing SLS causes blindness or severe damage to the cornea.
In response to the media attention generated by a company promoting the anti-SLS campaign at the time Green, the studys lead author, was interviewed regarding this work. Green stated that the company had misquoted the results and made claims that were not supported by his findings.15 His legal counsel later issued a letter to the company stating:
your citation of his work was not simply a misinterpretation, it was plainly wrong. By citing his research in support of erroneous conclusions, you have libeled Dr. Green. In fact, [you have] even attributed quotations to Dr. Green which he has never written or spoken, and which he would not ever write or speak.15
In this case, the dissemination of misconstrued results not only provided a disservice to the general public but also caused serious repercussions for the scientific researchers.
A second erroneous ocular health claim made about SLS is its link to cataract formation.16,17 Claims about SLS causing cataract formation tend to cite a study in the Journal of Biological Chemistry.18 This study18 along with several others1921 uses SLS to model cataract formation experimentally. In a controlled laboratory environment, cataract formation can be induced by immersing the lens of the eye in a concentrated solution of SLS. While concentrated SLS is useful as an experimental irritant, this is not relevant to evaluating human exposure to SLS in household cleaning products. Ocular irritation has been induced in vivo using SLS concentrations equivalent to a rinse-off personal care product containing 20% SLS.17 However, this was achieved after the eyes of laboratory animals were repeatedly exposed to 0.5 mL of shampoo for 14 days.17 While SLS is useful in studying the formation and repair of cataracts in laboratory settings, studies of this nature are not appropriate for assessing the risk of human exposure to SLS in cleaning products.
Furthermore, it should be noted that the anatomy of the eye renders direct exposure of the lens to SLS impossible, as it is deep within the eye protected by the cornea, and therefore, not vulnerable to exposure through typical consumer product usage.22,23 As such, a causal relationship between SLS in consumer products and cataract formation is not scientifically supported.
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Sodium lauryl sulfate (SLS) is a surfactant, which basically means it has an effect on the surfaces it touches. Its used in a variety of products such as food thickeners, toothpaste, and floor cleaners.
All the soaps and cleaning products that you use are a mix of water and oil. But they dont mix together on their own.
Instead, surfactants bring them together. Soap's cleaning power comes from the bonded oil and water molecules rubbing against dirt and grease.
That is why so many products have surfactants in them. They blend the ingredients that make cleaning happen.
Sodium lauryl sulfate is very easy and inexpensive to make, and it works well in many situations. You'll see it listed as an ingredient in common products found in the home and in the workplace.
Personal Products. These include things like:
SLS is also a foaming agent. Many of these products use SLS to give a foaming action during the cleaning process. If you have a foaming face wash or are working up a good lather with your shampoo, you're probably using something with SLS.
Contact us to discuss your requirements of Surfactant Amphoteric. Our experienced sales team can help you identify the options that best suit your needs.