Hard hat PE and ADS material difference

1. PE: Polyethylene Polyethylene is one of the most widely used polymer materials in everyday life, commonly found in plastic bags, films, and milk containers. It exhibits excellent resistance to various organic solvents and many acids and bases, but it is not resistant to oxidizing agents such as nitric acid. In an oxidizing environment, polyethylene can undergo oxidation. When in a film form, polyethylene appears transparent, but when crystallized, light scattering occurs due to the presence of numerous crystals, resulting in opacity. The degree of crystallinity in polyethylene is influenced by the number of branches—more branches lead to lower crystallization ability. The melting temperature of polyethylene also depends on branching, typically ranging from 90°C to 130°C, with more branched structures melting at lower temperatures. High-density polyethylene can be dissolved in xylene above 130°C to form single crystals. The molecular structure of polyethylene is represented as: -CH₂-CH₂-CH₂-CH₂-CH₂-CH₂-CH₂-CH₂-. 2. ABS: Acrylonitrile, Butadiene, Styrene ABS is a synthetic plastic made by graft copolymerizing acrylonitrile, butadiene, and styrene, named after the first letters of their English names. This material is known for its high strength, toughness, and overall performance, making it a popular choice for engineering plastics. In industry, polybutadiene latex or low-styrene-content styrene-butadiene rubber is often used as the main chain, while acrylonitrile and styrene are grafted onto it. The final product is usually a mixture of a butadiene-based graft polymer and an acrylonitrile-styrene copolymer (SAN or AS). Over time, new methods have emerged, including blending different proportions of styrene-acrylonitrile copolymers with ABS resin to tailor properties for specific applications. Since the mid-1950s, industrial production of ABS has expanded globally. Two main production methods exist: mechanical blending of polybutadiene or styrene-butadiene rubber with SAN resin, or emulsion graft copolymerization of acrylonitrile and styrene monomers into low-butadiene-content styrene-butadiene latex. In ABS, rubber particles are dispersed within the SAN resin matrix. These particles help absorb impact energy, reducing stress concentration and improving tear resistance. Grafting enhances compatibility between the rubber and the resin phase, which depends on the amount of free SAN and the composition of the grafted layer. A significant difference in acrylonitrile content may reduce compatibility and cause interface cracking. ABS can be processed using injection molding, extrusion, blow molding, and other techniques. It is also suitable for mechanical processing, adhesion, coating, and vacuum evaporation. Due to its good chemical resistance, lightweight nature, and cost-effectiveness, it is often used as a substitute for metal in electroplating applications. Additionally, flame-retardant and heat-resistant grades of ABS have been developed to meet diverse industrial needs. Different types of hard hats made from these materials offer varying levels of protection, allowing users to choose based on their specific requirements. China Labor Insurance Network