Tin in the form of organotins are used as stabilizers in PVC (vinyl)
products, particularly in rigid PVC products (Modern Plastics Handbook
2000). They are also used as catalysts in silicone production.
Organic tin compounds often consist of one, two, or three organic molecules
attached to an atom of tin. Those with one or two organic molecules
are often used to stabilize PVC plastic and are more likely to be present
in children's toys, whereas those with three organic molecules are primarily
used as pesticides. (Modern Plastics Handbook 2000). Para obtener más
información en español Estaño (Sn)
| ATSDR - ToxFAQs™.
HealthyStuff.org tested products for tin, which may be in an organic
or inorganic form.
Depending on the form and level of exposure:
Exposure to high levels of inorganic tin may cause symptoms including
stomach aches, liver and kidney problems, and anemia (ATSDR
Organic forms, known as organotins, are believed to be toxic at lower
levels of exposure.
Several tin compounds cause nervous system harm, including tributyl
tin, dibutyl tin, trimethyl tin, and dimethyl tin (Cooke 2004, Jenkins
- ToxFAQs™: Tin). The developing brain is particularly
vulnerable. Dibutyl tin is toxic to nervous system cells at concentrations
similar to those found in people today (Jenkins 2004).
Some forms of organotin, like tributyl tin and dibutyl tin, are
also toxic to the immune system (Cooke 2004)
Current Regulations for Products
The toy industry has not established a voluntary migration standard
for the amount of tin that can migrate from toys.
Two voluntary, third-party product standards specify limits for extractable tin in various materials. OKOE-TEX 100 standard for textiles and leather and the TUV Rheinland Group TOXPROOF & SG standards for textiles, leather and plastics restrict extractable tin to 1 ppm and non-detect respectively.