PTFE Fine Powder
Quality Specification of PTFE Fine Powder:
1:Smoothness&Clearness: White Sheet Surface,fiber is average
2:Tensile Strength: 24Mpa Min
3:Elogation at rupture 350% Min
4:Moisture 0.04% Max
5:Package: 25kg Per Drum
Polytetrafluoroethylene is a polymer of tetrafluoroethylene. The abbreviation is PTFE. The trade name is "Teflon". It is known as the "King of Plastics". The basic structure of PTFE is.-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2 -. Polytetrafluoroethylene (PTFE) is widely used in various acid-alkali resistant and organic solvents. It is not toxic to human beings, but PFOAA, one of the raw materials used in production, is considered to be carcinogenic. The relative molecular weight of polytetrafluoroethylene (PTFE) is large, the number of low molecular weight is 100, 000, and the high molecular weight is more than 10 million, generally it is millions (degree of polymerization is 10 ~ 4 orders of magnitude, while polyethylene is only 103? The general crystallinity is 90 ~ 95 ℃ and the melting temperature is 327 ~ 342 ℃. Because the radius of fluorine atoms is slightly larger than that of hydrogen, the adjacent CF2 units are not completely cross-oriented, but form a spiral twisted chain. Fluorine atoms cover almost the surface of the entire polymer chain. This molecular structure explains the properties of PTFE. When the temperature is below 19 ℃, it forms 13 / 6 helix, and at 19 ℃ phase transition occurs, and the molecule is slightly untied to form a 15 / 7 helix.
White sheet sruface,fiber is average, no gravel and metallic powder,even sheet texture≤1 for mechanical impurity or organic impurity.
White sheet surface,fiber is average,no gravel and metallic powder,allow 0.5mm organic impurity.
Standard Relative Density
Thermal Inst. Index≤
Electric Strength,MV/M ≤
Dielectric Dissipation Factor ≤
Execute according to requirment of HG/T3028-1999
It is suitable for making unsintered tape.
1.PTFE is packed in double layer PVC bags inside and in hard circular barrels outside. On the barrel,there should be attached label and quality certificate, on which there are brand,trademark,executive criterion,type,grade,lot No. and net content,pack date,checker and packer.
2.PTFE should be stored in clean dry warehouse to pervent from dust,moisture,etc,foreign matters.
3.The products are transported according to non-dangerous products.Heat,moisture,freezing and strong shock should be avoided during transportation.Over-bumpiness and compression is apt to make the resin bind together.
Insulation: not affected by environment and frequency, volume resistance up to 1018 ohm centimeters, low dielectric loss, high breakdown voltage.
Resistance to high and low temperature: the influence of temperature is small, the range of temperature range is wide, the temperature can be used-190 ~ 260 ℃.
Self-lubricity: with the smallest friction coefficient in plastics, it is an ideal non-oil lubricating material.
Surface non-stickiness: all known solid materials can not be adhered to the surface, is a surface energy of the smallest solid material.
Atmospheric aging resistance, radiation resistance and low permeability: long exposure to the atmosphere, surface and performance remain unchanged.
Non-combustibility: oxygen limit index below 90.
Chemical corrosion and weathering: PTFE is almost free from any chemical reagent except molten alkali metal. For example, in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even boiling in kingundefineds water, their weight and properties have not changed, they are almost insoluble in all solvents, and only slightly soluble in total alkanes (about 0.1 g / 100 g) above 300 ℃. PTFE does not absorb moisture, does not burn, is extremely stable to oxygen, ultraviolet ray, therefore has the excellent weather resistance.