Structure of rubber
14
Dec
Rubber Products knowledge

Structure of rubber

Linear structure: the general structure of unvulcanized rubber. Due to its large molecular weight, it is in the shape of fine ball without external force. When the external force is removed, the entanglement of the fine particles changes, and the molecular chain rebounds, resulting in a strong recovery tendency, which is the origin of rubber's high elasticity. Branch chain structure: aggregation of branch chains of rubber macromolecules to form gel. Gel is unfavorable to the properties and processing of rubber. When mixing rubber, various compounding agents often cannot enter the gel area, forming a local blank, which can not be…
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14
Dec
Rubber Products knowledge

Specification table of common O-ring

American standard specification table of O-ring (AS-568 series) numberIDODC/S(Wire Diameter)numberIDODC/SWire Diameter)AS-0010.742.781.02AS-02631.4735.031.78AS-0021.073.611.27AS-02733.0536.611.78AS-0031.424.481.53AS-02834.6538.211.78AS-0041.785.341.78AS-02937.8241.381.78AS-0052.576.131.78AS-03041.0044.561.78AS-0062.906.461.78AS-03144.1747.731.78AS-0073.697.251.78AS-03247.3550.911.78AS-0084.478.031.78AS-03350.5254.081.78AS-0095.298.851.78AS-03453.7057.261.78AS-0106.079.631.78AS-03556.7060.431.78AS-0117.6511.211.78AS-03660.0463.601.78AS-0129.2512.811.78AS-03763.2266.781.78AS-01310.8214.381.78AS-03866.4069.961.78AS-01412.4215.981.78AS-03969.5773.131.78AS-01514.0017.561.78AS-04072.7576.311.78AS-01615.6019.161.78AS-04175.9279.481.78AS-01717.1720.731.78AS-04282.2785.831.78AS-01818.7722.331.78AS-04388.6292.181.78AS-01920.3523.911.78AS-04494.9798.531.78AS-02021.9525.511.78AS-045101.32104.881.78AS-02123.5227.081.78AS-046107.62111.181.78AS-02225.1228.681.78AS-047114.02117.581.78AS-02326.7030.261.78AS-048120.37123.931.78AS-02428.3031.861.78AS-049126.72130.281.78AS-02529.8733.431.78AS-050133.07136.631.78AS-1021.246.482.62AS-14056.8262.062.62AS-1032.057.292.62AS-14158.4263.662.62AS-1042.848.082.62AS-14260.0065.242.62AS-1053.638.872.62AS-14361.6066.842.62AS-1064.429.662.62AS-14463.1768.412.62AS-1075.2310.472.62AS-14564.7770.012.62AS-1086.0211.262.62AS-14666.3571.592.62AS-1097.5912.842.62AS-14767.9573.192.62AS-1109.1914.432.62AS-14869.5274.762.62AS-11110.7716.012.62AS-14971.1276.362.62AS-11212.3717.612.62AS-15072.7077.942.62AS-11313.9519.192.62AS-15175.8781.112.62AS-11415.5420.782.62AS-15282.2287.462.62AS-11517.1222.362.62AS-15388.5793.812.62AS-11618.7223.962.62AS-15494.92100.162.62AS-11720.2925.532.62AS-155101.27106.512.62AS-11821.9027.142.62AS-156107.62112.862.62AS-11923.4728.712.62AS-157113.97119.212.62AS-12025.0730.312.62AS-158120.32125.562.62AS-12126.6531.892.62AS-159126.67131.912.62AS-12228.2533.492.62AS-160133.02138.262.62AS-12329.8235.062.62AS-161139.37144.612.62AS-12431.4236.662.62AS-162145.72150.962.62AS-12532.9938.232.62AS-163152.07157.312.62AS-12634.6039.842.62AS-164158.42163.662.62AS-12736.1741.412.62AS-165164.77170.012.62AS-12837.7743.012.62AS-166171.12176.362.62AS-12939.3544.592.62AS-167177.47182.712.62AS-13040.9546.192.62AS-168183.82189.062.62AS-13142.5247.762.62AS-169190.17195.412.62AS-13244.1249.362.62AS-170196.52201.762.62AS-13345.7050.942.62AS-171202.87208.112.62AS-13447.3052.542.62AS-172209.22214.462.62AS-13548.9054.142.62AS-173215.57220.812.62AS-13650.4755.712.62AS-174221.92227.162.62AS-13752.0757.312.62AS-175228.27233.512.62AS-13853.6558.892.62AS-176234.62239.362.62AS-13955.2560.492.62AS-177240.97246.212.62　　　　AS-178247.32252.562.62AS-2014.3411.403.53AS-243104.37111.433.53AS-2025.9413.003.53AS-244107.54114.603.53AS-2037.5214.583.53AS-245110.72,117.783.53AS-2049.1216.183.53AS-246113.89120.953.53AS-20510.6917.753.53AS-247117.07124.133.53AS-20612.2919.353.53AS-248120.24127.303.53AS-20713.8720.933.53AS-249123.42130.483.53AS-20815.4722.533.53AS-250126.59133.653.53AS-20917.0424.103.53AS-251129.77136.833.53AS-21018.6425.703.53AS-252132.94140.003.53AS-21120.2227.283.53AS-253136.12143.183.53AS-21221.8228.883.53AS-254139.30146.363.53AS-21323.4030.463.53AS-255142.47149.533.53AS-21425.0032.063.53AS-256145.65152.713.53AS-21526.5733.633.53AS-257148.82155.883.53AS-21628.1735.233.53AS-258152.00159.063.53AS-21729.7536.813.53AS-259158.35165.413.53AS-21831.3438.403.53AS-260164.70171.763.53AS-21932.9239.983.53AS-261171.05178.113.53AS-22034.5241.583.53AS-262177.40184.463.53AS-22136.1043.163.53AS-263183.75190.813.53AS-22237.7044.763.53AS-264190.10197.163.53AS-22340.8747.933.53AS-265196.45203.513.53AS-22444.0551.113.53AS-266202.80209.863.53AS-22547.2254.283.53AS-267209.15216.213.53AS-22650.4057.463.53AS-268215.50222.563.53AS-22753.5760.633.53AS-269221.85228.913.53AS-22856.7563.813.53AS-270228.20235.263.53AS-22959.9266.983.53AS-271234.55241.613.53AS-23063.1070.163.53AS-272240.90247.963.53AS-23166.2773.333.53AS-273247.25254.313.53AS-23269.4476.503.53AS-274253.60260.663.53AS-23372.6279.683.53AS-275266.30273.363.53AS-23475.7982.853.53AS-276279.00286.063.53AS-23578.9786.033.53AS-277291.70298.763.53AS-23682.1489.203.53AS-278304.40311.463.53AS-23785.3292.383.53AS-279329.80336.863.53AS-23888.4995.553.53AS-280355.20362.263.53AS-23991.6798.733.53AS-281380.60387.663.53AS-24094.84101.903.53AS-282405.26412.323.53AS-24198.02105.083.53AS-283430.66437.723.53AS-242101.19108.253.53AS-284456.06463.123.53AS-30910.4621.125.33AS-352123.19133.855.33AS-31012.0722.735.33AS-353126.37127.035.33AS-31113.6424.305.33AS-354129.54140.205.33AS-31215.2425.905.33AS-355132.72143.385.33AS-31316.8127.475.33AS-356135.89146.555.33AS-31418.4229.085.33AS-357139.07149.735.33AS-31519.9930.655.33AS-358142.24152.905.33AS-31621.5932.255.33AS-359145.42156.085.33AS-31723.1633.825.33AS-360148.59159.255.33AS-31824.7735.435.33AS-361151.77162.435.33AS-31926.3437.005.33AS-362158.12168.785.33AS-32027.9438.605.33AS-363164.47175.135.33AS-32129.5140.175.33AS-364170.82181.485.33AS-32231.1241.785.33AS-365177.17187.835.33AS-32332.6943.355.33AS-366183.52194.185.33AS-32434.2944.955.33AS-367189.87200.535.33AS-32537.4748.135.33AS-368196.22206.885.33AS-32640.6551.315.33AS-369202.57213.235.33AS-32743.8254.485.33AS-370208.92219.585.33AS-32846.9957.655.33AS-371215.27225.935.33AS-32950.1660.825.33AS-372221.62232.285.33AS-33053.3464.005.33AS-373227.97238.635.33AS-33156.5267.185.33AS-374234.32244.985.33AS-33259.6970.355.33AS-375240.67251.335.33AS-33362.8773.535.33AS-376247.02257.685.33AS-33466.0476.705.33AS-377253.37264.035.33AS-33569.2279.885.33AS-378266.07276.735.33AS-33672.3983.055.33AS-379278.77289.435.33AS-33775.5786.235.33AS-380291.47302.135.33AS-33878.7489.405.33AS-381304.17314.835.33AS-33981.9292.585.33AS-382329.55340.215.33AS-34085.0995.755.33AS-383354.97365.635.33AS-34188.2798.935.33AS-384380.37391.035.33AS-34291.44102.105.33AS-385405.26415.925.33AS-34394.62105.285.33AS-386430.65441.315.33AS-34497.79108.455.33AS-387456.06466.725.33AS-345100.96111.625.33AS-388481.46492.125.33AS-346104.14114.805.33AS-389506.86517.525.33AS-347107.32117.985.33AS-390532.26542.925.33AS-348110.49121.155.33AS-391557.66568.325.33AS-349113.67124.335.33AS-392582.65593.315.33AS-350116.84127.505.33AS-393608.10618.765.33AS-351120.02130.685.33AS-394633.50644.165.33　　　　AS-395658.85669.515.33AS-40137.4751.456.99AS-429126.37140.356.99AS-40240.6454.626.99AS-430129.54143.526.99AS-40343.8257.806.99AS-431132.72146.706.99AS-40446.9960.976.99AS-432135.89149.876.99AS-40550.1764.156.99AS-433139.07153.056.99AS-40653.3467.326.99AS-434142.24156.226.99AS-40756.5270.506.99AS-435145.42159.406.99AS-40859.6973.676.99AS-436148.59162.576.99AS-40962.8776.856.99AS-437151.77165.756.99AS-41066.0480.026.99AS-438158.12172.106.99AS-41169.2283.206.99AS-439164.47178.456.99AS-41272.3986.376.99AS-440170.82184.806.99AS-41375.5789.556.99AS-441177.17191.156.99AS-41478.7492.726.99AS-442183.52197.506.99AS-41581.9295.906.99AS-443189.87203.856.99AS-41685.0999.076.99AS-444196.22210.206.99AS-41788.27102.256.99AS-445202.57216.556.99AS-41891.44105.426.99AS-446215.27229.256.99AS-41994.62108.606.99AS-447227.97241.956.99AS-42097.79111.776.99AS-448240.67254.656.99AS-421100.97114.956.99AS-449253.57267.356.99AS-422104.14118.126.99AS-450266.07280.056.99AS-423107.32121.306.99AS-451278.77292.756.99AS-424110.49124.476.99AS-452291.47305.456.99AS-425113.67127.656.99AS-453304.17318.156.99AS-426116.84130.826.99AS-454316.87330.856.99AS-427120.02134.006.99AS-455329.57343.556.99AS-428123.19137.176.99AS-456342.27356.256.99AS-9014.707.541.42AS-457354.97368.956.99AS-9026.079.331.63AS-458367.67381.656.99AS-9037.6510.911.63AS-459380.37394.356.99AS-9048.9212.581.83AS-460393.07407.056.99AS-90510.5214.181.83AS-461405.26419.246.99AS-90611.8915.851.98AS-462417.96431.946.99AS-90713.4617.622.08AS-463430.66444.646.99AS-90816.3620.782.21AS-464443.36457.346.99AS-90917.9422.862.46AS-465456.06470.046.99AS-91019.1824.102.46AS-466468.76482.746.99AS-91121.9227.822.95AS-467481.46495.446.99AS-91223.4729.372.95AS-468494.16508.146.99AS-91325.0430.942.95AS-469506.86520.846.99AS-91426.6032.502.95AS-470532.26546.246.99AS-91629.7535.652.95AS-471557.66571.646.99AS-91834.4240.322.95AS-472582.65596.636.99AS-92037.4643.463.00AS-473608.10622.086.99AS-92443.6849.683.00AS-474633.50647.486.99AS-92853.0959.093.00AS-475658.85672.836.99AS-93259.3665.363.00　　　　
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Rubber raw material knowledge——EPDM
14
Dec
Rubber Products knowledge

Rubber raw material knowledge——EPDM

Ethylene propylene rubber is an elastomer made by copolymerization of ethylene, propylene or ethylene, propylene and a small amount of non conjugated dienes under the action of catalyst by solution method or suspension method. Ethylene propylene rubber can be divided into ethylene propylene diene monomer (EPDM) and ethylene propylene diene monomer (EPDM). Ethylene propylene rubber has excellent aging resistance (the best of general-purpose rubber), ozone resistance and heat resistance (ethylene propylene rubber can be used for a long time at 150 ℃ and intermittently at 170 ℃). Ethylene propylene rubber has the lowest specific gravity, can be filled with high…
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Rubber O-ring
14
Dec
Rubber Products knowledge

Rubber O-ring

O-ring belongs to extrusion seal, that is to say, it achieves the sealing purpose by compression deformation. Extrusion is the most commonly used type of seal, accounting for about 50%. Therefore, the wide application of O-ring is inseparable from its characteristics:  Good sealing effect, suitable for static, reciprocating and rotary seals Small and compact space; Easy to assemble and replace; ④ Wide application scope; ⑤ No adjustment is required; ⑥ Low friction; ⑦ Low price; ⑧ It can be sealed in both directions. Therefore, it is widely used in aircraft, bicycles, oil pressure, air pressure equipment, vacuum equipment, electronic…
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Rubber frozen trimming
14
Dec
Rubber Products knowledge

Rubber frozen trimming

1、 Process introduction The spray type freezing trimming machine is fully called the automatic spray type freezing trimming machine. The freezing trimming theory originated in Europe and the United States in the 1970s, and was later improved by Japan. The equipment is mainly used to remove burrs from rubber molded parts, precision injection molding and die-casting products instead of manual processing. Such equipment has been widely used in developed countries since the late 1970s, After 2000, it was gradually promoted in China and became one of the necessary equipment for the next process in the rubber and plastic industry. 2、…
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Rubber classification
14
Dec
Rubber Products knowledge

Rubber classification

Classification according to source and use: natural rubber, synthetic rubber; Synthetic rubber is also divided into general synthetic rubber and special synthetic rubber. Natural rubber Natural rubber mainly comes from clover rubber trees. When the skin of this rubber tree is cut, milky juice, called latex, will flow out. The latex can be condensed, washed, shaped and dried to obtain natural rubber. Synthetic rubber is made by artificial synthesis. Different kinds of rubber can be synthesized by using different raw materials (monomers). From 1900 to 1910, chemist C.D. Harris determined that the structure of natural rubber was a polymer of…
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14
Dec
Rubber Products knowledge

Processing of rubber products

The processing process of rubber products includes basic processes such as plasticizing, mixing, calendering or extruding, molding and vulcanizing. Each process has different requirements for products, which are supported by several auxiliary operations. In order to add various required ingredients to the rubber, the raw rubber must first be plasticized to improve its plasticity; Then, carbon black and various rubber additives are uniformly mixed with rubber to form rubber compound through mixing; The rubber is pressed into a blank with a certain shape; Then, it is combined with the calendered and glued textile materials (or metal materials) to form a…
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Principle and application of rubber sealing ring damping pad
14
Dec
Rubber Products knowledge

Principle and application of rubber sealing ring damping pad

Natural rubber and neoprene rubber are generally used as rubber damping pads. Nitrile rubber is required for oil resistance, silicon rubber is required for high and low temperature resistance, and butyl rubber is required for high damping. The manufacturing process of rubber shock pad products is similar to model products except that rubber air springs are similar to tires. It is usually made into supports or connectors and widely used in various vehicles, ships, machinery, instruments, bridges and buildings to eliminate or mitigate the adverse consequences of vibration. Rubber is characterized by both high elasticity and high viscosity. The elasticity…
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Precautions when installing seals
14
Dec
Rubber Products knowledge

Precautions when installing seals

1. Do not damage the sealing surface or sealing line of the sealing element surface The sealing performance of plane seals depends on the upper and lower end faces; The sealing performance of hydraulic seals depends on the lip line associated with the hole or shaft. These parts are composed of special materials that are soft and resilient, which are resistant to temperature, corrosion and aging, such as graphite, rubber, plastic and fiber, which are vulnerable to damage. Therefore, special protection and care should be given in the process of handling, installation and pipe protection. Once damaged, it often leaves…
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Physicochemical properties of hydrogenated nitrile rubber O-ring
14
Dec
Rubber Products knowledge

Physicochemical properties of hydrogenated nitrile rubber O-ring

Hydrogenated nitrile rubber is obtained by selectively hydrogenating butadiene group in nitrile rubber. The performance of hydrogenated nitrile rubber O-ring seals depends on the content of CAN (18% - 50%) and carbon carbon bond saturation. Its main characteristics are: good heat resistance, organic peroxide vulcanized materials can be used continuously for more than 1000 hours at 160 ℃, while NBR loses its continuous use value at 150 ℃; The oil resistance is excellent, and the performance of oil resistance and alcohol based oil resistance is greatly superior to the corresponding NBR and NBR/PVC blends; Low temperature resistance is better than…
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