Bronze (Br) is mainly composed of copper and tin. In addition, phosphorus, zinc, lead and other elements are often added. Bronze materials are corrosion-resistant, wear-resistant, have good mechanical properties and casting properties, and are very resistant to corrosion in the atmosphere, sea water, fresh water or steam.
Figure 1. Optical micrographs of bronze-filled PTFE with different bronze content 
Table 1. Comparison of performance parameters of bronze powder filled PTFE and pure PTFE
|Pure PTFE||High-filled Br/PTFE|
|Color||Milky white||Copper or dark brown|
|Shore hardness D||64||71|
|Chemical property||Almost resistant to any chemical corrosion||Not resistant to sulfide, liquid ammonia, acidic media, etc.|
|Tensile strength (MPa)||238||101|
|Elongation at break (%)||27.6||12.7|
|Compression set rate (%)||8.12||1.90|
|Compression 5% deformation rate (MPa)||12.9||21.3|
|Bending strength (MPa)||20.7||28.0|
|Coefficient of friction||0.13||0.20|
Note: The above data is for reference only. The actual product in use may vary due to different parts size, raw material batch type, and mechanical working conditions. In addition, the filled PTFE is a multi-element composite material, and the proportioning composition can be adjusted according to the actual working conditions of the customer, which is not fixed.
Figure 2. The results of dynamic friction and specific wear rate of samples with different aging time under two different temperatures under dry and water-lubricated sliding contact. Bronze PTFE (PB), Black glass fiber PTFE (PGF), MoS2+Black glass fiber PTFE (PGFM). 
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