The basic process of rubber processing includes basic processes such as molding, mixing, rolling or extrusion, forming, and vulcanization. Each process has different requirements for the product and is accompanied by several auxiliary operations. In order to add various required additives to rubber, raw rubber first needs to be plasticized to improve its plasticity; Then, carbon black and various rubber additives are evenly mixed with rubber to form a rubber compound through mixing; The rubber material is pressed out to form a certain shape blank; Then combine it with textile materials (or metal materials) that have been calendered, glued or coated to form a semi-finished product; After vulcanization, the plastic semi-finished product is then made into a highly elastic final product. Rubber is the basic raw material of the rubber industry, widely used in the manufacturing of tires, rubber pipes, tape, cables, and other various rubber products.
Rubber physical performance testing items
1. Physical property testing of vulcanized rubber
Shore A hardness, tensile performance, tear performance, compression fatigue heat generation, compression permanent deformation, aging resistance, flexural cracking, tensile fatigue, flexural cracking, crack growth, low-temperature brittleness, elasticity, wear resistance, thermal aging performance, ozone resistance, peel strength, liquid resistance test, etc.
2. Physical Property Testing of Unvulcanized Rubber
Unvulcanized rubber usually refers to raw rubber and blended rubber, and the testing of the performance of unvulcanized rubber is mainly for processing and production services. Including Mooney viscosity, Mooney scorch test, initial vulcanization performance test of rubber compound, vulcanization characteristic test of rubber compound, etc.
3. Environmental protection testing of rubber raw materials and products
Detection of carcinogenic substances such as polycyclic aromatic hydrocarbons in rubber products, detection of polycyclic aromatic hydrocarbon content and heavy metal content in oil products according to IP346 standards, Rosh detection, and substances of high concern (SVCH).
Rubber material sample testing items
1. Testing items for rubber mechanical properties: hardness, tensile performance, tear performance, compression performance, impact performance, friction performance, fatigue resistance, peel strength, tear off strength, adhesive strength, etc
2. Rubber environmental reliability testing projects: life assessment, aging testing (UV, xenon lamp, carbon arc lamp, ozone), salt spray test, oil resistance and other liquid testing, high and low temperature impact, high and low temperature cycling test, etc
3. Rubber combustion performance testing items: fire rating, vertical combustion, horizontal combustion, smoke density, oxygen index, flame spread rate, etc
4. Electrical performance testing items for rubber raw materials: surface resistivity, volume resistivity, breakdown voltage, dielectric constant, loss angle tangent, etc
5. Testing items for rubber physical and chemical indicators: volatile matter, ash content, Mooney viscosity, thermal stability, shear stability, vulcanization curve, Mooney scorch time, rubber thermal conductivity, rubber vapor transmission rate, rubber swelling index, rubber chemical metals, sulfur, and polymers.