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The PTFE sheet is the first sliding material used in high-speed railways and highways.
Performance requirements of PTFE in the presence of silicone grease：
ITEMS | PTFE | |||
DENSITYρ(g/cm³) | 2.14﹤ρ≦2.20 | |||
TENSILE STRENGTH(MPa) | ≥30 | |||
ELONGATION(%) | ≥300 | |||
BALL INDENTATION HARDNESS(H132/60) | 23≦H≦33 | |||
MODULUS OF ELASTICITY | 480≦Et≦720 | |||
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) | 8 | ||
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） | 30 | ||
TEMPERATURE（℃） | 21±2 | |||
RELATIVE SLIDING SPEED（mm/s) | 8 | |||
RECIPROCAL SLIDING DISTANCE（mm) | ±10 | |||
CUMULATIVE SLIDING DISTANCE（km） | 1 | |||
LINE ABRASION(μm/km) | ≦15 | |||
LOAD COMPRESSION DEFORMATION | AVERAGE COMPRESSIVE STRESS(MPa) | 60 | ||
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 | ||||
The PTFE sheet is the first sliding material used in high-speed railways and highways.
Performance requirements of PTFE in the presence of silicone grease：
ITEMS | PTFE | |||
DENSITYρ(g/cm³) | 2.14﹤ρ≦2.20 | |||
TENSILE STRENGTH(MPa) | ≥30 | |||
ELONGATION(%) | ≥300 | |||
BALL INDENTATION HARDNESS(H132/60) | 23≦H≦33 | |||
MODULUS OF ELASTICITY | 480≦Et≦720 | |||
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) | 8 | ||
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） | 30 | ||
TEMPERATURE（℃） | 21±2 | |||
RELATIVE SLIDING SPEED（mm/s) | 8 | |||
RECIPROCAL SLIDING DISTANCE（mm) | ±10 | |||
CUMULATIVE SLIDING DISTANCE（km） | 1 | |||
LINE ABRASION(μm/km) | ≦15 | |||
LOAD COMPRESSION DEFORMATION | AVERAGE COMPRESSIVE STRESS(MPa) | 60 | ||
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 | ||||
