Rubber strip is also called sealing strip, leather strip and rubber strip. According to different raw materials, it can be divided into natural rubber sealing strip, EPDM sealing strip, PVC rubber plastic sealing strip and silica gel products. Now I will introduce the performance and price of several sealing strips.

天然橡胶密封条使用量比较少，比较高。天然橡胶与多数合成橡胶相比，具有良好的综合力学性能，耐寒性，较高的回弹性及耐磨性。天然橡胶不耐矿物油，但在植物油和醇类中较稳定。在以正丁醇与精制蓖麻油混合液体组成的制动液的液压制动系统中作为密封件的胶碗，胶圈均用天然橡胶制造，一般密封胶也常用天然橡胶制造

The use of natural rubber sealing strip is relatively small and the price is relatively high. Compared with most synthetic rubber, natural rubber has good comprehensive mechanical properties, cold resistance, high resilience and wear resistance. Natural rubber is not resistant to mineral oil, but stable in vegetable oil and alcohols. In the hydraulic brake system of the brake fluid composed of n-butanol and refined castor oil, the rubber bowl is used as the seal, and the rubber ring is made of natural rubber, and the general sealant is also made of natural rubber

三元乙丙密封条弹性较好，表面光滑，使用寿命是14年左右，成本高，高质量的三元乙丙密封条可以回收，对于企业而言，也可以算的上是一种降低成本的方式。三元乙丙的密封条耐高低温，耐候性好，耐老化，耐腐蚀。导电阻燃绝缘。

EPDM sealing strip has good elasticity, smooth surface, service life of about 14 years, high cost, high quality EPDM sealing strip can be recycled, for enterprises, it is also a way to reduce costs. EPDM sealing strip is resistant to high and low temperature, good weather resistance, aging resistance and corrosion resistance. Conductive and flame retardant insulation.

三元乙丙橡胶的主链是不含双键的完全饱和的直链型结构，其侧链上有二烯泾，这样就可用硫磺硫化。三元乙丙橡胶具有优良的耐老化性，耐臭氧性，耐候性，耐热性(可在120℃环境中长期使用)，耐化学性(如醇，酸，强碱，氧化剂)，但不耐脂肪族和芳香族类溶剂侵蚀。三元乙丙橡胶在橡胶中密度是的有高填充的特性，但缺乏自粘性和互粘性。此外，三元乙丙橡胶有突出的耐蒸汽性能，可制作耐蒸汽膜片等密封制品。三元乙丙橡胶已广泛用于洗衣机，电视机中的配件和门窗密封制品，或多种复合体剖面的胶条生产中。

The main chain of EPDM is a fully saturated straight chain structure without double bond, and its side chain has diene Jing, so it can be sulfurized with sulfur. EPDM has excellent aging resistance, ozone resistance, weather resistance, heat resistance (can be used in 120 ℃ environment for a long time), chemical resistance (such as alcohol, acid, strong base, oxidant), but it is not resistant to the attack of aliphatic and aromatic solvents. EPDM has the lowest density and high filling property in rubber, but it lacks self adhesion and mutual adhesion. In addition, EPDM has outstanding steam resistance, which can be used to make steam resistant diaphragm and other sealing products. EPDM rubber has been widely used in washing machine, TV accessories, door and window sealing products, or in the production of rubber strips with multiple composite profiles.

PVC橡塑密封条弹性不佳，不能回收，使用年限比较短，一般是1--7年左右，不环保。成本低。不耐热。

PVC rubber and plastic sealing strip has poor elasticity and can not be recycled. Its service life is relatively short, generally about 1-7 years, not environmentally friendly. Low cost. Heat resistance.

硅胶制品的是45---60元/公斤。硅橡胶具有突出的耐高低温，耐臭氧及耐天候老化性能，在-70～260℃的工作温度范围内能保持其特有的使用弹性及耐臭氧，耐天候等优点，适宜制作热机构中所需的密封垫，如强光源灯罩密封衬圈，阀垫等。由于硅橡胶不耐油，机械强度低，昂贵，因此不宜制作耐油密封制品。

The price of silica gel products is 45-60 yuan / kg. Silicone rubber has outstanding high and low temperature resistance, ozone resistance and weather aging resistance. It can maintain its unique use elasticity, ozone resistance, weather resistance and other advantages within the working temperature range of - 70 ~ 260 ℃, and is suitable for making the sealing gasket needed in the thermal mechanism, such as the sealing ring of the strong light source lampshade, valve gasket, etc. Because silicone rubber is not oil-resistant, low mechanical strength and expensive, it is not suitable to make oil-resistant sealing products.

由此可见密封条的使用还含有很多的学问呢，不同材料的密封条的性能差异如此之大。在这里要提醒大家一下在先择密封条的时候一定要考虑周围的环境，根据上面的描述去选择你需要的密封条。

It can be seen that there is a lot of knowledge in the use of sealing strips. The performance of sealing strips made of different materials is so different. Here I would like to remind you to consider the surrounding environment when selecting the sealing strip first, and choose the sealing strip you need according to the above description.