A recent RAPEX report has detailed information on two footwear brands where traces of chrome VI have been found in shoes. These incidences of chrome VI were identified by German and Bulgarian authorities respectively and the products have been withdrawn from the market as they posed a chemical risk to consumers. Chrome VI is classified as sensitising and may trigger allergic reactions.
Chrome tanned leather is an extremely useful and valuable commodity for most industries because of its flexibility. The naturally occurring chrome III, which is used as the tanning agent, is perfectly safe if the leather is produced under the correct conditions and must not be confused with chrome VI. There are many advantages of using chrome tanned leather and this is why it is preferred for most leather products.
In leather production there are three ways in which chrome III could oxidise into chrome VI:
- During the tanning process – If the temperature or pH is too high then chrome III has the propensity to oxidise to chrome VI.
- Chemicals used – If chrome powder is sourced from a non-reputable supply then there is a possibility that it may contain chrome VI.
- Finished leather – After the leather has been made, there is a small chance of chrome III oxidising into chrome VI at high temperatures. This is why chrome tanned leather should never be incinerated.
The test method to detect chrome VI has recently been revised and published as EN ISO 17075:2007. This method has a detection limit of 3ppm and for a leather to pass; chrome VI must be none detected.
Regular due diligence testing will help limit the risk of chrome VI in products. For further information about chrome VI or for support on all aspects of chemical testing contact info@blcleathertech.com.
BLC members receive a 30% discount on all testing and problem solving.
