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Dongguan Minz Rubber & Plastics Co., Ltd.

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Commonly used gasket performance and materials and technology

Release time:

2019-07-03 12:30

Source:

Commonly usedWasherProperties and Materials and Technologies
 
When using the valve, often according to the specific situation, replace the original beltWasher. Commonly used washers are: rubber flat washers, rubber O-rings, plastic flat washers, PTFE-coated washers, asbestos rubber washers, metal flat washers, metal shaped washers, metal wrapping washers, wave washers, wound washers, etc.
(1) Rubber flat washer: easy to deform, easy to compress, but poor pressure and temperature resistance, only used for low pressure and low temperature. Natural rubber has a certain acid and alkali resistance, the use temperature should not exceed 60 ℃; chloroprene rubber can also withstand some acid and alkali, the use temperature of 80 ℃; nitrile rubber oil resistance, can be used to 80 ℃; fluorine rubber corrosion resistance is very good, temperature resistance is also stronger than ordinary rubber, can be used in 150 ℃ medium.
 
(2) Rubber O-shaped gasket: The cross-sectional shape is a perfect circle, which has a certain self-tightening effect. The sealing effect is better than that of a flat gasket, and the pressing force is smaller.
 
(3) Plastic flat washers: The biggest feature of plastics is good corrosion resistance, and most plastics have poor temperature resistance. PTFE is the crown of plastic, not only excellent corrosion resistance, but also a wide range of temperature resistance, can be used for a long time at -180 ℃ ~ 200 ℃.
 
(4) PTFE coated gasket: In order to give full play to the advantages of PTFE, while making up for its poor elasticity of the shortcomings, made of PTFE coated rubber or asbestos rubber gasket. In this way, it is not only as corrosion-resistant as PTFE flat washers, but also has good elasticity, enhances the sealing effect and reduces the pressing force. Its cross-sectional shape is shown in Figure 4-20.
 
(5) Asbestos rubber gasket: cut from asbestos rubber sheet. Its components are 60-80% asbestos and 10-20% rubber, as well as fillers, vulcanizing agents, etc. It has good heat resistance, cold resistance, chemical stability, and abundant supply, low price. When used, the pressing force does not need to be large. Because it can adhere to metal, it is best to coat the surface with a layer of graphite powder to avoid the difficulty of disassembly.
 
Asbestos rubber sheet has four colors: gray, used for low pressure (brand XB-200, pressure resistance ≤ 16kg/cm2, temperature resistance 200 ℃); Red, used for medium pressure (brand XB-350, pressure resistance up to 40kg/cm2, temperature resistance 350 ℃); Purple red, used for high pressure (brand XB-450, pressure resistance 100kg/cm2 temperature resistance 450 ℃); Green, used for oil, pressure resistance is also very good.
(6) Metal flat hot ring: lead, temperature resistant 100 ℃; Aluminum 430 ℃; Copper 315 ℃; Low carbon steel 550 ℃; Silver 650 ℃; Nickel 810 ℃; Monel (nickel-copper) alloy 810 ℃, stainless steel 870 ℃. Among them, lead has poor pressure resistance, aluminum can withstand 64kg/cm2, and other materials can withstand high pressure.
 
(7) metal heterosexual washer: lens washer: a self-tightening effect, used in high-pressure valves. Oval washer: also belongs to high pressure self-tightening washer. Conical double washer: used for high pressure internal self-tightening seal. In addition, there are square, diamond, triangle, tooth, dovetail, B- shaped, C- shaped, etc., generally only used in high and medium pressure valves.
 
(8) metal wrapping washer: metal has good temperature resistance and pressure resistance, and good elasticity. The wrapping materials are aluminum, copper, low carbon steel, stainless steel, monel alloy and so on. Inside the filling material is asbestos, PTFE, glass fiber and so on.
 
(9) Wave washer: It has the characteristics of small pressing force and good sealing effect. Often in the form of a combination of metal and non-metal.

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V-type, O-type, Y-type, rectangular, special-shaped sealing ring function

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V-type, O-type, Y-type, rectangular, special-shaped sealing ring function

More information

What is the difference between silicone plug and rubber plug

Silicone plug and rubber plug which one effect is good? Then today we will popularize their difference to where the end point is. First of all, rubber plug products, as a common type of industrial products and accessories, or have strong advantages, such as dust and water resistance, wear resistance, tear resistance, aging resistance, oil seal resistance and ozone radiation resistance, etc., while rubber materials are divided into various types, and the side materials over there can be made of dozens of compound materials, so different attribute functions can be deployed for different needs, as for some industries such as mechanical tight closure, electronic tight closure, vehicle construction and even aerospace and military industry, rubber blocking is the most suitable. Silicone rubber plug and rubber plug have one thing in common. They can be molded in the molding vulcanizer of silicone product manufacturers. The difference is that they are more environmentally friendly, have good high and low temperature resistance, feel better when touching by color hands, and can be in contact with human body skin for a long time. Therefore, silicone plugs for earphones and medical grade silicone plugs are widely used even in food silicone appliances, mainly or because of the material in particular the nature of the achievements of its scope of application. Silicone plug is different. Its material is mainly based on environmental protection advantages, material texture and comfortable application. Therefore, it is used in some electronic products, survival products and small-scale waterproof and dustproof household appliances. Its raw materials are mixed by precipitation method silica gel, high-fine molecular silicone gum and white carbon black. The molecular chain of the product is called heart, soft and comfortable to use! Compared with the materials of silica gel and rubber, they can be compared as follows: new technologies are used in traditional industries. Rubber materials have been heard for a long time in early years, so the comparison of rubber materials accounts for the majority. Up to now, more and more silicone rubber products have been reused because they can replace larger usage compared with rubber, namely environmental protection performance and various technologies, such as shape, pattern and color, etc. www.mingzhen2006.com

What are the fields of application of silicone keys for equipment

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The convenience of the use of industrial silicone buttons

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What are the molding techniques of rubber products?

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How to print the pattern on the transparent key

Some laser marking machines have played opaque keys. While using laser typing to knock out the paint, they will also burn the plastic parts that can transmit light, but cannot transmit light! Changzhou laser marking machine has a special device, which can adjust the machine to the function of laser processing light-transmitting key. The laser can clean the paint sprayed on the surface very clean without burning light-transmitting plastic, thus realizing light-transmitting key laser processing! YAG laser marking machine, the general laser marking machine can not do through the key! Light transmission keys, also called light transmission buttons, are widely used in electronic products. In dark environments, they can accurately and accurately find each button. The light transmission keys include a light transmission key body, an electronic switch located below the key body, and a luminous body. The luminous body is arranged on the lower side of the key body. A light guide body is arranged below the key body, and the light guide body has a body, the upper side of the body extends an extension to the position where the electronic switch is located, the outer surface of the extension is a first reflective slope, the lower surface of the body is a second reflective slope and doubles as a light touch surface that can be contacted with the electronic switch, and a light input part connected with the extension part and arranged corresponding to the light emitting body, the light emitting body emits light, the light is emitted to the first reflective slope through the introduction portion, and is reflected by the first reflective slope into the body, and the light entering the body is reflected by the second reflective slope out of the key body. The structure makes the light emitted from the light emitting surface of the key body more uniform, the key is more beautiful, and the user can accurately find the corresponding function key. The pattern and text on the keys are processed by laser typing! In our life, there are many keys and buttons that use laser typing and can transmit light, such as mobile phone keys, car audio keys, computer keys, and various electronic and electrical keys! www.mingzhen2006.com