Dating aroclors new england
Other open applications were as plasticizers in paints and cements, stabilizing additives in flexible PVC coatings of electrical cables and electronic components, pesticide extenders, reactive flame retardants and sealants for caulking, adhesives, wood floor finishes, such as Fabulon and other products of Halowax in the U.
S., It was also used as a plasticizer in paints and especially "coal tars" that were used widely to coat water tanks, bridges and other infrastructure pieces.
PCBs have entered the environment through both use and disposal.
The environmental fate of PCBs is complex and global in scale.
Different Aroclors were used at different times and for different applications.Intentional degradation as a treatment of unwanted PCBs generally requires high heat or catalysis (see Methods of destruction below).PCBs readily penetrate skin, PVC (polyvinyl chloride), and latex (natural rubber). In terms of their structure and toxicity, PCBs fall into 2 distinct categories, referred to as coplanar or non-ortho-substituted arene substitution patterns and noncoplanar or ortho-substituted congeners.These were sold under trade names followed by a 4-digit number.In general, the first two digits refer to the number of carbon atoms in the biphenyl skeleton (for PCBs this is 12); the second two numbers indicate the percentage of chlorine by mass in the mixture.