Raw raw rubber is commonly known as raw rubber. In fact, raw rubber is not 100% pure. For example, non-rubber hydrocarbons (about 5%) contained in natural rubber include resin acids and proteins. Anti-aging agents and Undepleted synthetic auxiliaries, such as molecular weight control agents, terminating agents and dispersants. However, in general, raw rubber is more representative of rubber's inherent characteristics than rubber, including the following:

Refers to the average molecular weight of rubber macromolecules. Rubber should be considered as a system of polymers with different molecular weights. There are both high molecular weight fractions and some low molecular weight fractions. This is unavoidable, so only average molecular weights can be used. Concept to describe. According to different test methods, viscosity average molecular weight, scattered average molecular weight and weight average molecular weight are divided. The more commonly used is viscosity average molecular weight, because it is easier to measure, and it is more intuitive to use different viscosities to characterize different molecular weights (the larger the molecular weight, the higher the viscosity). There is a direct and close relationship between molecular weight and raw rubber properties. Generally speaking, the larger the molecular weight, the higher the strength of the raw rubber and the better the mechanical properties. However, as the molecular weight increases, the fluidity during processing becomes worse.