Chemical tests
BS EN ISO 27587:2021 pdf free.Leather一Chemical tests – Determination of free formaldehyde in process auxiliaries. Prepare a sample preparation system as described in Li. Initially, the U-tube (f4) and the DNPH cartridge (5J.2) are disconnected from the sampling system. All the parts of the sample preparation system shall be dry prior to use. Add 3 g to 4 g of […]
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