I also encourage you to use tested and certified materials rather than attempting to engineer your own.

That constitutes "certifying the chain of custody": tracking certified materials through the whole supply chain.

It provides evidence that certified material in a certified product originates from certified forests.

In addition, much of the interior is also made from recycled or LEED certified materials.

A programme for testing and certification of dental biomaterials on the Nordic market was established, and the first lists of certified materials were published in 1974.

Mutual recognition of FSC and PEFC certified material in the chain of custody has not yet happened.

Chain of Custody certification tracks the certified material through the production process - from the forest to the consumer, including all successive stages of processing, transformation, manufacturing and distribution.

It allows manufacturers to mix FSC certified material with uncertified materials in FSC labelled products under controlled conditions.

The FSC Chain of Custody (CoC) system allows the tracking of FSC certified material from the forest to the consumer.

For critical applications, third party verification of these tests may be required; in this case an independent lab will produce a certified material test report(CMTR), and the material will be called certified.

In his lecture on bogus parts, he tells the students that every aircraft part, down to the rivets, must be made from specific certified materials, but there is a huge business in selling cheaper, noncertified parts to suppliers.