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        # Beyond PVC: How CPW Transforms Rubber Compounding Economics

        

**Topic:** Technical

        

You're spending a fortune on specialty rubber plasticizers when a solution that costs 40% less is sitting right in front of you  -  and it adds flame retardancy for free.

        
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## Problem

Rubber compounders typically rely on expensive naphthenic or paraffinic process oils for plasticization. While effective, these oils offer zero flame retardancy and can migrate out of the rubber matrix over time, leading to shrinkage and hardening. For applications like conveyor belts, seals, and automotive components, this is a ticking time bomb.

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## Likely cause

This issue often stems from inconsistent compounding temperatures, inferior raw material purity, or unbalanced stabilizer ratios within the formulation matrix.

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## Corrective direction

NBT Gold Grade CPW (45% Cl₂) serves as an exceptionally cost-effective secondary plasticizer in rubber compounds. It provides **dual functionality**: plasticization at a fraction of the cost of specialty oils, and inherent flame retardancy from its chlorine content. At 10-20 PHR in EPDM or CR compounds, it improves processability on the mill, enhances filler dispersion, and reduces the compound cost by up to 15%. Our Bawana warehouse maintains ready stock for immediate dispatch to rubber units across Delhi-NCR.

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          ## Frequently Asked Questions

          
### Is CPW compatible with all rubber types?

It works best with polar rubbers like CR (Neoprene) and CSM. For non-polar rubbers like NR/SBR, it should be used as a secondary plasticizer alongside paraffinic oil.

### Does it affect rubber hardness?

Yes, it will lower Shore A hardness similar to other plasticizers. Adjust your filler loading accordingly.

        
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By NBT Technical Desk · Updated 2026-06-07

        

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