During injection moulding of moulded parts in the plastics industry very high temperatures of up to 300°C can arise in the die. Extremetemperature greases on the basis of synthetic base oils are therefore used to lubricate moving parts of form tools.
In order to avoid time-consuming re-lubrication which always involves an interruption in the production process, the lubricant used must lubricate the ejector pins and slides of an injection moulding die reliably over a long period without the grease becoming encrusted or the moving parts becoming immobile due to a lack of lubricant film caused by the basic oil volatising. Also deposits of the lubricant on the plastic parts must be avoided since they usually cause these work pieces to be rejected.
This is to be ensured for a moulding cycle that is as large as possible. In particular in the automotive supplying industry ejection intervals in the region of up to 15,000 cycles are required, naturally without re-lubrication. OKS 4240 is used with great success in lubricating the moving parts in plastic injection moulding systems in the automotive industry. The injection cycles could be increased significantly.
OKS 4240 is based on perflouropolyether oil with an inorganic thickener. This fullysynthetic oil is suitable for high temperatures and is characterised by an excellent media resistance and compatibility to plastics. In addition PTFE is contained as a solid lubricant to a small extent in OKS 4240. This results in a reduction of the coefficient of friction as well as notably improved emergency running properties.