Recycling of Plastics

STASSKOL has been working on the topic of ‘recycling PTFE’ for several years. The special focus here is on the material ‘SK801’, a highly filled sealing material for hydrogen compressors based on PTFE. The waste from this material has been consistently collected in production for years and initially roughly shredded. This includes not only chips, but also remnants of semi-finished products or defective sealing rings. This is followed by fine grinding to grain sizes below 50 micrometres (Figure 8), so that the recyclate can be added to the virgin material at a proportion of 25% by weight. The mechanical properties as well as the excellent wear properties are not affected by the recycling process.