What is PBT and vPvB?

PBT substances are substances that are Persistent, Bioaccumulative and Toxic (PBT). vPvB substances are substances that are very Persistent and very Bio-accumulative (vPvB). PBT substances and vPvB substances pose big threats to human health and the environment.

What is PBT assessment?

Annex XIII to the REACH Regulation sets criteria for substances that are persistent, bioaccumulative and toxic (PBT) or very persistent and very bioaccumulative (vPvB). Under REACH, a PBT/vPvB assessment is required for all substances for which a chemical safety assessment is carried out.

What is PBT hazard?

Persistent bioaccumulative and toxic (PBT) substances are therefore harmful chemicals that persist overtime (do not break down easily in the environment) and are especially hazardous for human health and ecosystems.

What is reach SVHC?

A substance of very high concern (SVHC) is a chemical substance (or part of a group of chemical substances) concerning which it has been proposed that use within the European Union be subject to authorisation under the REACH Regulation.

What is the meaning of bioaccumulation?

Bioaccumulation is defined as the net accumulation of a contaminant in or on an organism from all sources including water, air, and diet (Newman and Unger, 2003).

What is the role of PBT?

Polybutylene terephthalate (PBT) is a thermoplastic engineering polymer that is used as an insulator in the electrical and electronics industries.

What is the SVHC candidate list?

It is called the “Candidate List” because the SVHCs listed are those assessed by ECHA before being possibly subjected to Restrictions (Annex XVII of REACH) or Authorisation (Annex XIV of REACH). Watch out, SVHCs are added to the Candidate List every 6 months!

What is Annex XIV of REACH?

Annex XIV of the REACH Regulation lists all the substances which uses are subject to an authorisation in the European Union, as well as their properties, their latest application dates and their sunset dates.

What does bioaccumulation mean for kids?

Kids Encyclopedia Facts. Bioaccumulation is a process in which toxic substances (such as pesticides) accumulate in living organisms. This poses a threat to health, life, and the environment. Similar terms are bioconcentration, biological concentration, or biological magnification.

What is bioaccumulation in pharmacology?

Bioaccumulation is the gradual accumulation of substances, such as pesticides or other chemicals, in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost or eliminated by catabolism and excretion.

Is PBT amorphous or crystalline?

Overview. Polybutylene Terephthalate (PBT) is a crystalline, high molecular weight polymer that has an excellent balance of properties and processing characteristics. Because the material crystallizes rapidly, mold cycles are short and molding temperatures can be lower than for many engineering plastics.

Is PBT UV resistant?

It can be used at higher temperatures, and fibreglass reinforced PBT provides even better heat resistance. PBT has good UV and weather resistance and also good sliding properties, which means it is often found in cars. The material is suitable for metallising.