The production process of fluororubber gaskets begins with the selection and formulation of raw materials. Fluororubber, as the core base material, contains fluorine atoms in its molecular structure, an element that gives the material its resistance to high temperatures and chemical corrosion. Manufacturers need to precisely control the proportions of raw materials, mixing the base fluororubber with fillers, vulcanizing agents, processing aids, and other auxiliary materials according to a predetermined ratio. The key to this step is ensuring the uniform distribution of each component, avoiding defects in subsequent processing due to uneven mixing.
After mixing, the raw materials enter the compounding process. The compounding equipment uses mechanical shearing and heat to fully integrate the rubber with various additives, forming a homogeneous compound. Temperature and time control are crucial in this process; excessively high temperatures may cause premature vulcanization, while excessively low temperatures may lead to insufficient mixing. The compounded rubber needs to be cooled and allowed to stand to release internal stress and stabilize the material properties.
Next is the preforming stage. The compounded rubber is processed into semi-finished products, such as sheets or strips, using extrusion or calendering equipment, approaching the shape of the final product. Pre-forming is not only for initial shaping but also aims to eliminate any air bubbles that may be present in the rubber compound, ensuring material density. Some manufacturers use precision metering devices at this stage to control the dimensional accuracy of the semi-finished product and reduce material waste in subsequent processing.
Vulcanization is a crucial step in the molding of fluororubber gaskets. The pre-formed rubber compound is placed in a mold and heated under specific temperature and pressure. During vulcanization, a cross-linked network forms between rubber molecules, and the material transforms from a plastic state to an elastic state, thereby obtaining the required mechanical properties and chemical stability. The vulcanization conditions must be precisely adjusted according to the product thickness, formulation composition, and performance requirements. Insufficient time may lead to incomplete cross-linking, while excessive time may cause material aging.