Chlorinated Paraffin Wax — CPW, CAS 63449-39-8 — is one of the most widely used secondary plasticizers in Indian PVC processing. It partially replaces costlier primary plasticizers like DOP and DBP while adding flame retardance, which is why cable compound makers rarely run without it. Supreme Petro Chemicals stocks liquid CPW at approximately 52% chlorine content in Chennai for bulk supply across South India.
The Grade System — What 42 / 52 / 70 Actually Means
CPW grades are named for their approximate chlorine content, and the number changes what the material does:
- CPW-42 (~42% chlorine): lower viscosity, used where higher plasticizing efficiency matters more than flame retardance — flexible PVC goods, footwear compounds, and as an extreme-pressure additive in metalworking fluids.
- CPW-52 (~52% chlorine): the workhorse grade in India. The balance of viscosity, compatibility and chlorine content suits PVC cable insulation and sheathing, flooring, hoses, footwear, rexine/leather cloth, rubber compounding, and flame-retardant paints.
- CPW-70 / 70S (~70% chlorine, solid): a solid resin used primarily as a flame-retardant additive rather than a plasticizer — in paints, coatings and polyolefin masterbatches.
Buying rule of thumb: if the requirement says "CPW" with no number in a PVC or cable context, it almost always means the 52 grade — but confirm chlorine content on the Certificate of Analysis rather than assuming.
CPW-52 Specification — The Values That Matter
These are the indicative specification values for the liquid ~52% chlorine grade SPC supplies (reproduced from the manufacturer-published specification; a batch-specific CoA accompanies every consignment):
- Appearance: pale yellow viscous liquid
- Colour (Hazen): max 50
- Specific gravity @ 27°C: 1.400 ± 0.02
- Chlorine content: ~52%
- Viscosity (Ford Cup 6 mm): 25–75 poise
- Free mineral acidity: max 0.01%
- Volatile loss (130°C / 3 h): max 0.80%
- Thermal stability (175°C / 4 h): max 0.20% HCl
- Refractive index: min 1.49
For processors, the two values worth checking on every lot are thermal stability (poor stability releases HCl during processing and attacks machinery and stabiliser packages) and colour (high Hazen values show up in light-coloured end products).
Where CPW-52 Is Used
- Wire & cable: secondary plasticizer in PVC insulation and sheathing compounds — cost reduction plus flame retardance in one additive.
- Flexible PVC: flooring, hoses, films, footwear and leather cloth, partially replacing DOP.
- Rubber: plasticizer and flame-retardant additive in conveyor belting and moulded goods.
- Paints & coatings: plasticizing binder in chlorinated rubber and flame-retardant systems.
- Metalworking fluids: extreme-pressure additive in cutting oils.
Packaging & Supply
SPC supplies CPW in 250 kg HDPE drums from stock in Chennai, with bulk quantities arranged against requirement. Every consignment carries the manufacturer's batch CoA; the CPW product page has the Technical Data Sheet as a direct download.
FAQ
What is the CAS number and HSN code for chlorinated paraffin wax?
CAS 63449-39-8; HSN code 38249900 is used for CPW in Indian trade. Quote both on purchase orders to avoid grade ambiguity.
Is CPW a replacement for DOP?
Partially. CPW-52 is a secondary plasticizer — it replaces a portion of the primary plasticizer (typically DOP or DINP) in a PVC formulation, usually 20–40% of the plasticizer load, lowering cost and adding flame retardance. It cannot replace the primary plasticizer entirely without hurting low-temperature flexibility.
How do I get a CPW quote from SPC?
Share the grade (chlorine %), monthly quantity, delivery location and packaging preference via the contact page or the enquiry button on the product page. Quotes are typically answered within 4 working hours, Monday to Saturday.