Technical requirements: 1, thickness: thickness of unilateral guarantee between 0.20 ~ 0.35mm, the surrounding wall thickness limit deviation ± 0.025mm. 2. Bending: product does not allow hard-bend, lateral bending (curvature of freedom except sagging). 3, Appearance: smooth surface, no bump, neat uniform pores. Product packaging, labeling, transportation, storage: 1, packing: carton packaging and braids have two kinds of packaging. Each unit package bundle weight 20 ± 0.05kg (woven with packaging), 25 ± 0.05kg (carton), requires the appearance of neat, straight, no twisting phenomenon, no exposed. 2. Identification: Product name clearly marked on the packaging, weight, date of manufacture, company name, address, logo and other qualified. 3. Transportation: This product is non-dangerous goods, cars, trains, airplanes, etc. can transport. 4. Storage: Store in a dry place.