Carbon Black for Shoe Soles and Footwear
Carbon black for shoe soles has to deliver abrasion resistance, slip resistance and color together in rubber and thermoplastic soles. Semi-reinforcing grades strike this three-way balance economically.
A shoe sole is exposed to impact and friction thousands of times a day, and it must still stay flexible. Here, carbon black increases abrasion resistance, gives the color and balances the cost.
Use by sole type
- Rubber soles: Semi-reinforcing grades (N772, N774) offer high filler capacity and good processability. N330 and N299 are used in work shoes that need higher abrasion resistance.
- TPR and TPU soles: Carbon black is added via masterbatch; color and UV protection come first here.
- EVA midsoles: Low density must be preserved; low-structure grades and low dosages are preferred.
What PE wax contributes
In thermoplastic sole production, PE wax is used as a mold release agent and lubricant: it makes demolding easier, improves surface gloss and flow, and shortens the cycle time.
Color consistency
In footwear production, batch differences are visible at a glance: a difference in tone between two soles of the same model is a reason for returns. That is why, in this sector, the batch-to-batch consistency of carbon black's tint strength (ASTM D3256) matters more than its absolute value.
What to Watch For in This Industry
Batch consistency shows up as tone differences
Do not change grades within the same production run; if you must, check the color and recalibrate the tone.
High filler loading can reduce slip resistance
Raising the filler level to cut cost can lower the coefficient of friction; this value should be tested for safety footwear.
Recommended Products for This Industry
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Industry-Specific Questions
Which grade is best for shoe soles?
For general-purpose rubber soles, N772 and N774 give a good cost-performance balance. N330 or N299 are preferred for work and safety footwear that needs high abrasion resistance.
We see whitening (bloom) on the sole surface.
This usually comes not from the carbon black but from excess sulfur or accelerator in the formulation. Even so, the sulfur content of the carbon black should be included in the formulation balance.
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