Introduction to the guide tape: The guide tape plays a guiding role. In order to prevent the cylinder barrel and piston rod from wearing, it is extremely wear-resistant, low-friction, heat-resistant, and chemical-resistant. It allows any foreign matter to be embedded in the guide wear ring to prevent particles from affecting the cylinder And the loss of seals, has the ability to absorb vibration, and has excellent wear resistance and good dry running characteristics.
Material characteristics of guide tape:
Material: PTFE+copper powder, phenolic cloth, wood cypress
Main features: guiding function and absorbing vibration performance, and has excellent wear resistance and good dry running characteristics.
Working temperature: The general working temperature range is -40～120 ℃.
Guide tape product details:
Due to the excellent properties of fluorocarbon resin (PTFE) such as low friction, corrosion resistance, and thermal stability, the guide tape has been widely used as friction and sealing parts, especially in corrosive media, and this problem is often common metals and other non-metals The material is difficult to solve. The elasticity and toughness of fluorocarbon resin make it an excellent sealing material, especially when it is further modified by various fillings and compounded with certain aromatic resins into plastic alloys, it can obtain higher load-bearing capacity and thermomechanical stability. Resistance, wear resistance and PV limit value.
PTFE polytetrafluoroethylene guide tape Chemical properties:
Atmospheric aging resistance: radiation resistance and low permeability: long-term exposure to the atmosphere, the surface and performance remain unchanged.
Non-combustibility: The oxygen limit index is below 90.
Acid and alkali resistance: insoluble in strong acids, strong alkalis and organic solvents (including magic acid, namely fluoroantimony sulfonic acid).
Oxidation resistance: resistant to corrosion by strong oxidants.
Advantages of PTFE guide tape
High temperature resistance-the working temperature can reach 250℃.
Low temperature resistance-has good mechanical toughness; even if the temperature drops to -196 ℃, it can maintain 5% elongation.
Corrosion resistance-It is inert to most chemicals and solvents, and can withstand strong acids and alkalis, water and various organic solvents.
Weather resistance-has the best aging life among plastics.
High lubrication-is the low friction coefficient of solid materials.
Non-adhesion-is the small surface tension of solid materials, and does not adhere to any substances.
Non-toxic-with physiological inertness, as an artificial blood vessel and organ implanted in the body for a long time without adverse reactions.
The relative molecular mass of polytetrafluoroethylene is relatively large, the low is hundreds of thousands, the high is more than ten million, generally several million (the degree of polymerization is on the order of 104, while polyethylene is only 103). Generally, the crystallinity is 90-95%, and the melting temperature is 327-342℃. The CF2 units in the polytetrafluoroethylene molecule are arranged in a zigzag shape. Since the radius of the fluorine atom is slightly larger than that of hydrogen, the adjacent CF2 units cannot be completely cross-oriented in trans, but form a spiral twisted chain, almost covered by the fluorine atom The surface of the entire polymer chain. This molecular structure explains the various properties of polytetrafluoroethylene. When the temperature is lower than 19°C, a 13/6 helix is formed; at 19°C, a phase change occurs and the molecules are slightly unwound to form a 15/7 helix.