Due to the highly flexible of PTFE, it creeps or deforms under heavy loads. By adding fillers, the properties of multiple materials can be combined to improve the potential shortcomings of PTFE. In addition to common fillers such as glass, carbon, graphite, molybdenum disulfide, bronze and polyimide prepared PTFE composite materials, Alfa Chemistry Fluoropolymers can also provide some other filling types of PTFE composite materials to provide specific advantages for certain applications.
Ceramic Filled PTFE
- Ceramics are silicate materials. Generally, the main components are silicon oxide, aluminum oxide, and a small amount of sodium oxide, potassium oxide, calcium oxide, magnesium oxide, iron oxide, titanium oxide, etc.
- Ceramic particles are filled into PTFE, which changes part of the original properties of PTFE, such as reduced compression rate and enhanced resilience. But it will also lead to a decrease in tensile strength and elongation at break, a decrease in chemical stability, and an increase in the coefficient of friction. The composite material is suitable for long-lasting mechanical seal parts.
Figure 1. SEM images of brittle fracture surface of ceramics filled PTFE composite with different size 
Aromatic polyester reinforced PTFE
Polyphenyl ester reinforced PTFE (POB/PTFE)
Mineral Filler Filled PTFE
Mineral fiber reinforced PTFE
- Mineral fibers are fibers obtained from mineral rocks with fibrous structures. The main components are various oxides, such as silicon dioxide, aluminum oxide, and magnesium oxide. The main sources are various types of asbestos, such as chrysotile and crocidolite, etc.
- The reinforcement effect of mineral fiber on PTFE is similar to that of glass fiber, mainly to improve the abrasion resistance, creep resistance and dimensional stability of PTFE.
- It has good chemical resistance, high abrasion resistance and extremely high heat resistance, cold resistance and anti-extrusion properties. Especially suitable for high-temperature and high-pressure working occasions, but not suitable for inorganic acid medium, because it will be corroded by acid.
- Kodakkattu P. Murali, Surendran Rajesh, Kunnamkuzhakal J. Nijesh, Ravendran Ratheesh, International Journal of Applied Ceramic Technology 7 (2010) 475-481.
- Ye Sujuan, Zeng Xingrong, Tribology Transactions 57 (2014) 382-386.
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