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The Modified PTFE sheet is a new type of sliding material with high pressure-bearing, creep resistance, low coefficient of friction and high wear resistance, developed by our company in cooperation with Tsinghua University, in order to meet the needs of customers to different working conditions. It overcomes the dependence of M-PE sheets on silicone grease and the disadvantages of PTFE not being wear resistant, which is mainly used in bridge bearings for high-speed railways and highways.
Performance requirements of M-PTFE in the presence of silicone grease
ITEMS | M-PTFE | |||
DENSITYρ(g/cm³) | 2.0﹤ρ≦2.10 | |||
TENSILE STRENGTH(MPa) | ≥21 | |||
ELONGATION(%) | ≥300 | |||
BALL INDENTATION HARDNESS(H132/60) | 26.4≦H≦39.6 | |||
MODULUS OF ELASTICITY | 600≦Et≦900 | |||
SLIDING FRICTION COEFFICIENT WITH STAINLESS STEEL SHEET UNDER 5201-2 SILICONE GREASE LUBRICATION CONDITION | INITIAL STATIC FRICTION COEFFICIENT（μ） | RELATIVE SLIDING SPEED (mm/s) | 0.4 | |
TEMPERATURE（℃） | 21±2 | ≦0.012 | ||
0±2 | ≦0.018 | |||
﹣35±2 | ≦0.035 | |||
COEFFICIENT OF DYNAMIC FRICTION（μ） | RELATIVE SLIDING SPEED (mm/s) | 15 | ||
TEMPERATURE（℃） | 21±2 | ≦0.005 | ||
0±2 | ≦0.012 | |||
﹣35±2 | ≦0.025 | |||
LINE WEAR RATE WHEN RUBBING AGAINST STAINLESS STEEL SHEET UNDER 5201-2 SILICONE GREASE LUBRICATION | COMPRESSIVE STRESS（MPa） | 45 | ||
TEMPERATURE（℃） | 21±2 | |||
RELATIVE SLIDING SPEED（mm/s) | 15 | |||
RECIPROCAL SLIDING DISTANCE（mm) | ±10 | |||
CUMULATIVE SLIDING DISTANCE（km） | 50 | |||
LINE ABRASION(μm/km) | ≦5 | |||
LOAD COMPRESSION DEFORMATION | AVERAGE COMPRESSIVE STRESS(MPa) | 90 | ||
TEMPERATURE（℃） | 35±2 | |||
HOLDING TIME(h) | 48 | |||
COMPRESSION DEFORMATION(mm) | ≦0.0005h | |||
THE h REPRESENTS THE INITIAL EXPOST HIGHT | ||||
FOR THICKNESS OF BOARD GREATER THAN TWO MILIMETERS, TENSILE STRENGTH AND ELONGATION OF SPECIMEN MADE BY TURNING OF PREPARING METHOD SHOULD NOT BE LESS THAN 90% OF THE SPECIFIED VALUE IN THE TABLE | ||||
Performance requirements under silicone-free conditions
ITEMS | M-PTFE | ||||||
SLIDING FRICTION COEFFICIENT BETWEEN STAINLESS STEEL SHEET AND SILICONE GREASE LUBRICATION | INITIAL STATIC FRICTION COEFFICIENT（μ） | COMPRESSIVE STRESS（MPa） | 45 | ||||
RELATIVE SLIDING SPEED (mm/s) | 0.4 | ||||||
TEMPERATURE（℃） | 23±2 | ≦0.07 | |||||
0±2 | ≦0.08 | ||||||
﹣35±2 | ≦0.10 | ||||||
COEFFICIENT OF DYNAMIC FRICTION（μ） | RELATIVE SLIDING SPEED (mm/s) | 15 | |||||
TEMPERATURE（℃） | 23±2 | ≧0.05 | |||||
0±2 | ≧0.06 | ||||||
﹣35±2 | ≧0.008 | ||||||
WEAR RATE OF SLIDING FRICTION LINE WITH STAINLESS STEEL SHEET UNDER SILICONE-FREE LUBRICATION CONDITION | COMPRESSIVE STRESS（MPa） | 45 | |||||
TEMPERATURE（℃） | 23±2 | ||||||
RELATIVE SLIDING SPEED（mm/s) | 15 | ||||||
RECIPROCAL SLIDING DISTANCE（mm) | ±10 | ||||||
CUMULATIVE SLIDING DISTANCE（km） | 10 | ||||||
LINE ABRASION(μm/km) | ≦100 | ||||||
LOAD COMPRESSION DEFORMATION | AVERAGE COMPRESSIVE STRESS(MPa) | 120 | |||||
TEMPERATURE（℃） | 35±2 | ||||||
HOLDING TIME(h) | 48 | ||||||
COMPRESSION DEFORMATION(mm) | ≦0.0005h | ||||||
PERFORMANCE REQUIREMENTS FOR DYNAMIC FRICTION COEFFICIENT OF A SILICONE-FREE GREASE LUBRICATED SLIDE UNDER SEISMIC ACTION | |||||||
DYNAMIC FRICTION COEFFICIENT OF A SLIDING SHEET LUBRICATED WITHOUT SILICONE GREASE UNDER SEISMIC ACTION | COMPRESSIVE STRESS（MPa） | 45 | ≧0.05 | ||||
RELATIVE SLIDING SPEED（mm/s) | 200 | - - - - | |||||
TEMPERATURE（℃） | 23±2 | - - - - | |||||
CORRELATION OF NUMBER OF REPEATED LOADS | CHANGE RATE OF DYNAMIC FRICTION COEFFICIENT BETWEEN THE 3RD CYCLE AND THE 20TH CYCLE (%) | ≦20 | |||||
The Modified PTFE sheet is a new type of sliding material with high pressure-bearing, creep resistance, low coefficient of friction and high wear resistance, developed by our company in cooperation with Tsinghua University, in order to meet the needs of customers to different working conditions. It overcomes the dependence of M-PE sheets on silicone grease and the disadvantages of PTFE not being wear resistant, which is mainly used in bridge bearings for high-speed railways and highways.
Performance requirements of M-PTFE in the presence of silicone grease
ITEMS | M-PTFE | |||
DENSITYρ(g/cm³) | 2.0﹤ρ≦2.10 | |||
TENSILE STRENGTH(MPa) | ≥21 | |||
ELONGATION(%) | ≥300 | |||
BALL INDENTATION HARDNESS(H132/60) | 26.4≦H≦39.6 | |||
MODULUS OF ELASTICITY | 600≦Et≦900 | |||
SLIDING FRICTION COEFFICIENT WITH STAINLESS STEEL SHEET UNDER 5201-2 SILICONE GREASE LUBRICATION CONDITION | INITIAL STATIC FRICTION COEFFICIENT（μ） | RELATIVE SLIDING SPEED (mm/s) | 0.4 | |
TEMPERATURE（℃） | 21±2 | ≦0.012 | ||
0±2 | ≦0.018 | |||
﹣35±2 | ≦0.035 | |||
COEFFICIENT OF DYNAMIC FRICTION（μ） | RELATIVE SLIDING SPEED (mm/s) | 15 | ||
TEMPERATURE（℃） | 21±2 | ≦0.005 | ||
0±2 | ≦0.012 | |||
﹣35±2 | ≦0.025 | |||
LINE WEAR RATE WHEN RUBBING AGAINST STAINLESS STEEL SHEET UNDER 5201-2 SILICONE GREASE LUBRICATION | COMPRESSIVE STRESS（MPa） | 45 | ||
TEMPERATURE（℃） | 21±2 | |||
RELATIVE SLIDING SPEED（mm/s) | 15 | |||
RECIPROCAL SLIDING DISTANCE（mm) | ±10 | |||
CUMULATIVE SLIDING DISTANCE（km） | 50 | |||
LINE ABRASION(μm/km) | ≦5 | |||
LOAD COMPRESSION DEFORMATION | AVERAGE COMPRESSIVE STRESS(MPa) | 90 | ||
TEMPERATURE（℃） | 35±2 | |||
HOLDING TIME(h) | 48 | |||
COMPRESSION DEFORMATION(mm) | ≦0.0005h | |||
THE h REPRESENTS THE INITIAL EXPOST HIGHT | ||||
FOR THICKNESS OF BOARD GREATER THAN TWO MILIMETERS, TENSILE STRENGTH AND ELONGATION OF SPECIMEN MADE BY TURNING OF PREPARING METHOD SHOULD NOT BE LESS THAN 90% OF THE SPECIFIED VALUE IN THE TABLE | ||||
Performance requirements under silicone-free conditions
ITEMS | M-PTFE | ||||||
SLIDING FRICTION COEFFICIENT BETWEEN STAINLESS STEEL SHEET AND SILICONE GREASE LUBRICATION | INITIAL STATIC FRICTION COEFFICIENT（μ） | COMPRESSIVE STRESS（MPa） | 45 | ||||
RELATIVE SLIDING SPEED (mm/s) | 0.4 | ||||||
TEMPERATURE（℃） | 23±2 | ≦0.07 | |||||
0±2 | ≦0.08 | ||||||
﹣35±2 | ≦0.10 | ||||||
COEFFICIENT OF DYNAMIC FRICTION（μ） | RELATIVE SLIDING SPEED (mm/s) | 15 | |||||
TEMPERATURE（℃） | 23±2 | ≧0.05 | |||||
0±2 | ≧0.06 | ||||||
﹣35±2 | ≧0.008 | ||||||
WEAR RATE OF SLIDING FRICTION LINE WITH STAINLESS STEEL SHEET UNDER SILICONE-FREE LUBRICATION CONDITION | COMPRESSIVE STRESS（MPa） | 45 | |||||
TEMPERATURE（℃） | 23±2 | ||||||
RELATIVE SLIDING SPEED（mm/s) | 15 | ||||||
RECIPROCAL SLIDING DISTANCE（mm) | ±10 | ||||||
CUMULATIVE SLIDING DISTANCE（km） | 10 | ||||||
LINE ABRASION(μm/km) | ≦100 | ||||||
LOAD COMPRESSION DEFORMATION | AVERAGE COMPRESSIVE STRESS(MPa) | 120 | |||||
TEMPERATURE（℃） | 35±2 | ||||||
HOLDING TIME(h) | 48 | ||||||
COMPRESSION DEFORMATION(mm) | ≦0.0005h | ||||||
PERFORMANCE REQUIREMENTS FOR DYNAMIC FRICTION COEFFICIENT OF A SILICONE-FREE GREASE LUBRICATED SLIDE UNDER SEISMIC ACTION | |||||||
DYNAMIC FRICTION COEFFICIENT OF A SLIDING SHEET LUBRICATED WITHOUT SILICONE GREASE UNDER SEISMIC ACTION | COMPRESSIVE STRESS（MPa） | 45 | ≧0.05 | ||||
RELATIVE SLIDING SPEED（mm/s) | 200 | - - - - | |||||
TEMPERATURE（℃） | 23±2 | - - - - | |||||
CORRELATION OF NUMBER OF REPEATED LOADS | CHANGE RATE OF DYNAMIC FRICTION COEFFICIENT BETWEEN THE 3RD CYCLE AND THE 20TH CYCLE (%) | ≦20 | |||||
