Third, the mark on the helmet of claim 1 should have the following three helmets each permanent marker: a manufacturer's name and trademark, model; b manufacturing year, month; c license number.... 2 helmets the following provisions shall have other properties make a mark in the hat: a meet the low temperature performance of the helmet, making low temperature mark, such as "-20 ℃", - the words "30 ℃"; b. . meet the performance requirements of combustion resistant helmet, made in the cap "R" mark;. c compliance with electrical insulation properties required helmet, made of "D" marked on the cap;. d in line with the requirements of lateral rigidity helmets, made "CG" marked on the cap. Fourth, a helmet helmet inspection rules, must be identified according to the standard specified by the State supervision and inspection department, after obtaining a license, before production. 2 Each helmet factory, must have batch verification and factory inspection department inspection certificate. 1,000 to 20,000 as a group. 3 helmet when you press GB2812 ~ 81 bulk sample testing provisions, such as failure, should then take double product retest. There is still a failure after reinspection by, the batch of helmets to be ineligible. 4 technical inspection department designated by the State, the right to direct the product from time to time technical performance testing. For non-standard production, product technical performance mainly the business, the right to make a warning or revoke the production license. 5 production licenses renewed every two years. Five other helmet of claim 1. Low temperature performance under conditions of a temperature below -10 ℃, the manner described above shock absorption and penetration resistance tests. 2. Resistant to combustion performance with 2kg gasoline blowtorch flame cap shell is thinner at (in the crowns of a circle, 100mm outside diameter portion) 10s, when the burner flame is removed, the cap should be self-extinguishing flame shell within 5s. 3. Electrical insulation test 1200V AC 1min, leakage current should not exceed 1.2mA. 4. Plus pressure on both sides of lateral rigidity in the cap after 430N, maximum transverse deformation of the cap should not be too shell 40mm, after unloading deformation should not exceed 15mm. Sixth, the helmet material: ABS, ABS paint, glass, steel, PE seven helmet styles: single rib helmet, helmet flat single tendon, along Pirates no helmet, helmet through holes, small along helmet, fiberglass helmet, V-shaped helmet, VP or VA helmets, welding helmets, the use of cold cap, cap miners, police helmet helmet protective effect of the head based on the following two points: 1. Forces dispersed the load transfer profile from the cap over the whole area of ??the skull, avoid blow a little focus. 2. Because of the structural characteristics of the buffer to absorb energy helmet, enabling the space between the head and the crowns can absorb energy, play a role, and therefore reduce or prevent damage. Contact QQ: 2082124957 Contact: Zhao Li Jin Tel: 0311-80934497 18332463497 welcome to inquire