5.3 Leather

・Types Of Leather

・Synthetic Leather
The surface of the synthetic leather is mainly divided into two kinds of materials: PU (polyurethane) or PVC (polyvinyl chloride). If the leather is PVC, it is strongly not recommended for laser processing (see Dangerous Materials). When PU is not completely burned, hydrogen cyanide might be produced.

・Genuine Leather
In general, in order to increase the thickness and increase the durability, the leather will be processed
by tanning, that is, the part of the leather which is similar to the non-woven material. The tanned layer will require a slower speed when cutting.

・How To Prevent Burn Marks On Leather
Leather gets burnt and curled easily when processed by laser. Soaking the entire piece of leather in water
before processing should help.

・Ventilation Requirements for Leather
Since there are many amino groups and benzene rings in the leather protein composition, nitrogen oxides or aromatic compounds may be produced during combustion. If the leather object is engraved
or cut for a long time, the ventilation requirements should be much higher than wood or acrylic. It is
recommended to use an air filter and discharge the air to a safer place.

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