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In modern industrial production, a substance widely used in plastics, rubber, coatings, and other fields remains largely unknown to ordinary consumers: chlorinated paraffins. With its unique properties and cost-effectiveness, this compound has become one of the world’s most produced flame retardants. However, its environmental and health risks are gradually coming to light.
Chlorinated paraffins (CPs) are a class of synthetic organic compounds derived from paraffin hydrocarbons (primarily n-alkanes) through chlorination reactions. The degree of chlorination is the key factor determining their final form and properties.
Though sharing the same origin, chlorinated paraffin and ordinary paraffin exhibit stark differences in properties and applications:
Chemical Structure: Paraffin wax primarily consists of straight-chain alkanes (CₙH₂ₙ₊₂), while chlorinated paraffin is formed when hydrogen atoms in alkanes are partially or fully replaced by chlorine atoms (CₙH₂ₙ₊₂₋ₘClₘ).
Physical Properties: Paraffin wax is a white solid with a melting point between 48-70°C and is flammable. Chlorinated paraffin wax transitions from liquid to solid as chlorine content increases, exhibiting flame retardancy, plasticizing properties, and electrical insulation.
Applications: Paraffin wax is primarily used in candles, packaging, cosmetics, etc. while chlorinated paraffin is primarily used as an auxiliary plasticizer and flame retardant in industrial applications.
Plastics and Rubber Industry: As an auxiliary plasticizer, chlorinated paraffin can partially replace phthalate plasticizers, reducing production costs while enhancing material flame retardancy. Approximately 35% of global chlorinated paraffin consumption is directed toward polyvinyl chloride (PVC) products, including electrical wires and cables, flooring materials, and waterproofing membranes.
Metalworking Sector: Chlorinated paraffin serves as a key component in extreme pressure additives, significantly enhancing the performance of cutting fluids, gear oils, and lubricants. During metalworking processes, it forms protective films under high temperatures and pressures, reducing tool wear and improving machining precision.
Paints and Sealants: Chlorinated paraffins enhance the flame retardancy, water resistance, and durability of coatings, making them commonly used in fire-retardant paints, marine coatings, and construction sealants.
Textile Treatment: Certain chlorinated paraffins serve as flame-retardant finishing agents for textiles, particularly suited for public-space textiles requiring fire resistance, such as theater curtains and hotel carpets.
It is worth noting that due to environmental and health concerns, chlorinated paraffins are gradually being replaced in certain applications. For example, in the European Union, short-chain chlorinated paraffins (SCCPs) have been banned in many uses.
| Model | Short-chain chlorinated paraffins (SCCPs) | Medium-chain chlorinated paraffins (MCCPs) | Long-chain chlorinated paraffins (LCCPs) |
|---|---|---|---|
| Carbon chain length | C10-C13 | C14-C17 | ≥C18 |
| SCCPs have been restricted or banned by multiple international conventions (such as the Stockholm Convention) due to their high persistence and bioaccumulation in the environment. | |||
| The EU REACH Regulation classifies SCCPs as Substances of Very High Concern (SVHCs) and restricts the use of MCCPs in certain products. | |||
| As a major producer and consumer of chlorinated paraffins, China has begun strengthening environmental controls on SCCPs and promoting the development of alternatives. | |||
Low-chlorine products: Typically containing 40%-50% chlorine, these are mostly liquid and offer superior plasticizing and low-temperature performance.
Medium-Chlorine Products: Chlorine content generally ranges from 50% to 60%, representing the most widely used category. They offer a balanced profile of plasticizing properties, flame retardancy, and cost-effectiveness.
High-Chlorine Products: Chlorine content can exceed 70%, typically appearing as solids or semi-solids. They exhibit exceptional flame retardancy but relatively weaker plasticizing effects.
Note: Common grade designations (e.g., CP-42, CP-52, CP-70) often directly or indirectly indicate chlorine content; for instance, CP-52 denotes chlorinated paraffin with approximately 52% chlorine.
Environmental Persistence and Bioaccumulation:
Chlorinated paraffins, particularly short-chain chlorinated paraffins (SCCPs), exhibit high persistence and bioaccumulation. They degrade slowly in the environment, with half-lives ranging from several years to decades. Studies indicate that SCCPs have been detected in water bodies, sediments, the atmosphere, and even in Arctic organisms in remote regions. These compounds can accumulate through the food chain, reaching elevated concentrations in top predators.
Toxic Effects:
Animal studies indicate that high doses of SCCPs can damage organs such as the liver, kidneys, and thyroid, and may affect developmental and reproductive systems. The International Agency for Research on Cancer (IARC) classifies SCCPs as “possibly carcinogenic to humans” (Group 2B). Toxicity data for medium- and long-chain SCCPs is relatively scarce, but potential risks cannot be ruled out.
Global Mobility:
Chlorinated paraffins, particularly short-chain products, exhibit semi-volatility and can undergo long-range atmospheric transport. This explains their detection in remote regions like the Arctic, where SCCPs have never been used.
With heightened environmental awareness and stricter regulations, the chlorinated paraffin industry faces pressure to transform. Developing more eco-friendly alternatives—such as phosphorus-based flame retardants and bio-based plasticizers—has become a key industry focus.
For consumers, understanding product ingredients, choosing environmentally friendly materials, gradually reducing reliance on high-risk chemicals, and supporting sustainable production are effective ways to drive the industry toward safer practices.
We are always committed to delivering optimal chemical solutions for all application scenarios.
