PTFE-based compositions (raw materials)

PTFE-4 has a large number of positive properties and unique resistance to many factors. But despite that is still has low heat conductivity and strength which does not permit to use it clean in stressed antifriction parts. With this purpose various filled compositions are made on basis of PTFE-4, increasing hardness, mechanical strength, wear resistance, rigidity, electric conductivity of unfilled PTFE-4.

At present there is large number of various fillers, which may be divided into the following groups:

• fibrous (reinforcing);
• skeleton;
• woven;
• non-woven;
• powder-like:
• mineral;
• organic;
• metallic.

Each of the fillers improves this or that characteristic of PTFE-4. Main requirement to composite fillers is that they should withstand temperature of PTFE-4 processing – +360°C.

Often as composite fillers are used:

• glass fiber (S): increases wear resistance, heat resistance provides for stable size during shrinking and water intake, reduces cold flow and linear expansion coefficient;
• carbon fiber (UV): increases hardness, wear resistance, creep resistance, specific heat conductivity, increases plastic module and resilience module under compression;
• coke (К): increased wear resistance;
• graphite (G): increases mechanical strength and aids to preserve properties;
• boron nitride (NB);
• molybdenum disulfide (М): increases strength and hardness, reduces friction coefficient;
• cobalt blue (KS);
• bronze (B): increases hardness, heat conductivity, stability of size and wear resistance (by 450 times);
• aluminium anhydride (Al).

Kind of filler for a composition directly depends on its purpose and area of usage of the final product.

Most popular are the following PTFE-4 based compositions:

• F-4 К20: used to make antifriction products and sealing elements for flexible joints. F-4 К20 may contact to anodized aluminium alloys, stainless steel and titanium alloy ОТ-4;
• F-4 К15М5: used to make parts working in condensing humid gases. A-4 К15М5 has increased wear resistance and lower friction coefficient, making it very suitable for production of sliding friction bearings and pads of sliding supports;
• F-4 S15 and F-4 S15М5 are used to make gaskets and various structural units working under frequent shock loads. F-4 S15 is very elastic, resistant against any aggressive media. Except that this composition has creep resistance coefficient increased by 1,5 times. F-4 S15 may contact with titanium alloys (ОТ-4), anodized aluminium alloys (plated) and stainless steels;
• F-4 KS2: is used to make various antifriction fixed parts and moving seals. F-4 KS2 – excellent material to make bearings having high elasticity, chemical and heat resistance, increased run-in speed. F-4 KS2 may contact to bronze, aluminium alloys and rubber;
• F-4 АО10: used to make parts insulating switching devices. F-4 АО10 is especially stable to electric arc action during crown discharge.

Polymer Company offers high quality PTFE-4 based compositions.

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