The PET bottle industry use injection molded preforms to blow mold 2 liter and smaller bottles for soda and other drinks including water. Formation of toxic acetaldehyde that is reported to affect taste and odor of the contents of packaging is controlled after the problem is generated during the preform molding process that also re integrates recylced PET back into the mix. Most of this is done in third world countries that have no real regard for protocol and accountability for the most part. Formation of the aldehydes which can include formaldehyde depending on the extent of thermal degradation and residence time and lack of proper purging and cleaning seems counterproductive to finding a root solution to control the initiation steps for the formation of the aldehydes. The current solution is a chemical that breakdown to form 2 methyl-4-hydroxy-1,3-diazanaphthalin, (2-methyl-4-hydroxy-chinazoline a skin irritant and eye irritant! So, the question is why not solve the problem upstream and eliminate the need to a aldehyde scavenger when you can stop the formation of the aldehydes initially? Just asking
What specifically are you addressing here Phil that is on Prop 65? The acetaldehyde or the chemical used to address formed aldehydes and the transformation by products of that chemical?
If you are referring to acetaldehyde and formaldehyde you have the answer.
Today in the market checks and balances are eliminated for profit and since there are no penalties for doing taking the wrong actions it continues.
There are limits on the amount of acetaldehyde and formaldehyde in plastics and that is regulated by EPA and REACH. It is in the best interest of the industry to do the right thing but there are so few left that are willing to take the risk.
No Significant Risk Level (NSRL) - Inhalation:
90 µg/day
Safe harbor levels, which include No Significant Risk Levels (NSRLs) for cancer-causing chemicals and Maximum Allowable Dose Levels (MADLs) for chemicals causing reproductive toxicity, have been established for many of the chemicals listed under Proposition 65. Exposure levels and discharges to drinking water sources that are below the safe harbor levels are exempt from the requirements of Proposition 65. In some instances, enforcement actions may have resulted in negotiated exposure levels relative to specific settlement agreements. Please visit the Attorney General's Proposition 65 web site at https://oag.ca.gov/prop65 for further information about specific enforcement actions.
Below is a list of NSRLs and MADLs established in regulation in Title 27, Cal. Code of Regulations, Sections 25705, 25709 and 25805. These safe harbor levels do not preclude the use of alternative levels that can be demonstrated by their users as being scientifically valid. A hyperlink is provided for those NSRLs or MADLs for which the documentation of their derivation is electronically available.
OEHHA has also prioritized certain chemicals for NSRL development.
The U.S. Environmental Protection Agency (EPA) has set the inhalation unit risk for acetaldehyde at 2.2 x 10^-6 (μg/m3) which is 10^-9 ppm.
If we do not like the science or the results it is up to us to convince those making this decision. I agree the TLV levels are extremely low. However, you wanted the facts and this is public information.
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