Chlorine vs Chlorine-Free
Metalworking fluids typically contain a variety of additives to improve their performance. One group of additives called extreme pressure additives work to reduce friction and adhesion between the tool/die and the metal being worked.
Extreme pressure additives are a wide ranging chemistry of products (e.g. sulfurized fatty materials, chlorinated parafins, phosphorus derivatives). Each additive presents unique characteristics. Chlorinated parafins are one of the most commonly used additives due to the cost performance aspect. Due to environmental concerns, some chlorinated paraffins have been replaced with chlorine-free chemistry.
There are other reasons to consider chlorine-free metalworking products.
- Sometimes waste haulers charge extra fees due to chlorine content. Depending on how the waste is treated, the chlorine can cause extra handling or special equipment.
- Chlorinated products sometimes do not provide adequate rust protection. The chlorinated paraffin can break down in the metalworking process and actually become a rust promoter.
- Subsequent operations may not be compatible with chlorinated products, in particular welding or heat-treating may break the chlorine down to create an acidic byproduct unsuitable for environmental and health considerations.
- Chlorinated products are not compatible with the metals. It may simply cause staining or in some cases can actually weaken the metal.
The concerns listed above are not unique to just chlorinated parafins. Many others, and most commonly sulfurized compounds, can present similar issues.
Please consult with Lamson Oil Company for additional assistance.
