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One of the lead seals is plastic seal. Plastic seals are very popular because they are flexible and durable. One of the reasons for their flexibility and sturdiness is that its material is PP+PE, which means polypropylene and polyethylene in Chinese. What is the difference between the two?
Let’s take a look at the similarities between PP and PE. Both are non-toxic, and both are milky white translucent waxy polymers, which are easy to shape but not easy to deform because of their chemical properties. relatively stable. The difference between the two is that polyethylene is easy to be oxidized. Polypropylene has good strength and heat resistance. The rigidity is also OK. The density of polypropylene is lower than that of polyethylene, but its toughness at low temperatures is relatively poor. This is mainly determined by the characteristics of the two. PP is a kind of thermoplastic resin made by polymerization of propylene. It is non-toxic, odorless, low density, strength, rigidity, hardness, and heat resistance are better than low-pressure polyethylene. It can be used at around 100 degrees. It has good electrical properties and High-frequency insulation is not affected by humidity, but it becomes brittle, non-wearing, and easy to age at low temperatures. It is suitable for making general mechanical parts, corrosion-resistant parts, and insulating parts.
Common acid and alkali organic solvents have almost no effect on them and can be used for food utensils. E is a thermoplastic resin prepared by polymerization of ethylene, odorless, non-toxic, and feels like wax. It has excellent low-temperature resistance performance, the lowest operating temperature can reach -70～-100℃, good chemical stability, can withstand most acids and alkalis but not resistant to oxidizing acids, insoluble in general solvents at room temperature, low water absorption, The electrical insulation performance is excellent, but the properties of polyethylene vary from species to variety, its chemical and mechanical reactions to the environment are relatively poor, and its thermal aging performance is relatively poor. Polyethylene can be processed by general thermoplastic molding methods. It has a wide range of uses, mainly used to make films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulating materials for TVs, radars, etc. In view of the characteristics of the two, plastic seals use a combination of the two as The material makes the hardness and softness of the plastic lead seal just right.
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