Material Analysis
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Unstable hardness of SBC soft products
Problem Phenomenon
The hardness of SBC soft products is unstable, and Shore hardness fluctuation exceeds the allowable range
Cause Analysis
SBC styrene/butadiene ratio fluctuation affects hardness
Improper processing temperature (deviating from 180-220°C) causes microstructure changes
Additive (such as oil extension amount) fluctuation
Cooling rate differences affect crystallization or phase separation
Molecular weight distribution differences between raw material batches
Solution
Stabilize the SBC ratio by selecting a fixed model
Strictly control processing temperature within the 180-220°C range
Stabilize the oil extension amount or other additives
Unify cooling conditions
Select SBC raw materials with stable molecular weight distribution
Key Takeaway
SBC hardness requires stable ratio and processing conditions
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