TF Type

TF-C . TF-316 . TF-316S . TF-625 . TF-625S . TF-F51

The TF type is a composite multilayer material used in the manufacture of dry self-lubricating Sliding Bearings.
The main parts composing this product are a filled modified PTFE layer (lead free, in accordance to the European Parliament “ELV” directive 2000/53/EC) for the sliding self-lubricating surface, and a special primer used to allow the sintering of the PTFE layer to four types of baking metal layers, like carbon steel, bronze, stainless steel and Inconel 625.
Thanks to its structure, the TF type provides an excellent match between the mechanical strength of the steel, and the low coefficient of friction due to the modified PTFE sliding layer.
This is a product, that can be used in applications with medium loads, and in a clean environment with low levels of abrasive elements such as metal powders. It can also be used with special mineral oils and specific greases such as silicone compounds or lithium soap.


SLIDING BEARING SECTION

GRAPHIC LOAD/SPEED
TF-C . TF-316 . TF-625 . TF-F51

GRAPHIC LOAD/SPEED
TF-316S . TF-625S

PS: the values shown in the graph were determined with a test of constant load, and running for 1000 cycles at three different temperatures: -190 °C, +18 °C and +260 °C

Dimensions

TABLE LEGEND:

SIZE:
Inside and outside bearing diameters
INSIDE Ø:
Tolerance range of the inside diameter after the assembly in the seat (mm)
HOUSING/SEAT Ø:
Housing/seat tolerance (mm)
BEARING THICKNESS:
Thickness tolerance of the finished bearing (mm)
CUT:
Maximum opening of the bearing flaps (carbon steel, 316 and 625) (mm)
SHAFT Ø:
Correct size of the shaft to be used with the bearing

BEARING THICKNESS CUT SHAFT Ø
SIZE
I.D. - E.D.
INSIDE Ø
MIN AND MAX
HOUSING/SEAT Ø
MIN AND MAX
ADM. THK. IDEAL RANGE ADM. THK. C.S. 316/625 CORRECT SIZE
[[ dato.01 ]] [[ dato.02 ]] [[ dato.03 ]] [[ dato.04 ]] [[ dato.05 ]] [[ dato.06 ]] [[ dato.07 ]] [[ dato.08 ]] [[ dato.09 ]] [[ dato.10 ]] [[ dato.11 ]]

Comparison table

TF-C
Carbon Steel S235 JR
+Sintering
+ Filled PTFE film

TF-316
Aisi 316L
+ Sintering
+ Filled PTFE film

TF-316S
Aisi 316L
+ Sintering *
+ Filed PTFE
modified film
TF-625
Inconel 625
+ Sintering
+ Filled PTFE film

TF-625S
Inconel 625
+ Sintering *
+ Filed PTFE
modified film
TF-F51
Duplex A182 F51
+ Sintering
+ Filled PTFE film

FASTRACK SERVICE
SUPPORTING SHELL C 0.17%, S 0.045%
Mn 1.40%, N 0.009%
P 0.045%
C 0.03%, Mn 1.80%
S 0.025%, Cr 16.70%
P 0.03%, Ni 10.00%
Si 0.50%, Mo 2.00%
C 0.03%, Mn 1.80%
S 0.025%, Cr 16.70%
P 0.03%, Ni 10.00% Si 0.50%, Mo 2.00%
C 0.10%, Co 1.00%
Mn 0.05%
Ta + Nb 3.15 ÷ 4.15%
Cr 20 ÷ 23%, Ni Rest
Mo 8 ÷ 10%
C 0.10%, Co 1.00%
Mn 0.05%
Ta + Nb 3.15 ÷ 4.15%
Cr 20 ÷ 23%, Ni Rest
Mo 8 ÷ 10%
C 0.20%, Cr 22.70%
S <0.15%, Ni 5.60%
P 0.025%, Mo 3.20%
Si 0.50%, N 0.16%
Mn 1.40%
The given values are nominal values from literature.
SLIDING LAYERS Filled PTFE film, colour black-gray, thickness 200–220 micron,
heavy load capacity and self-lubricating under dry operation, lead free and non-coated.
Filed PTFE modified film, colour black, thickness 200-220 micron,
heavy load capacity and self-lubricating under dry operation, valid just for TF-316S and TF-625S.
SINTERING Sintering process made in oven between PTFE and the steel backing at a temperature of +250 ° C, BRONZE FREE
* Special adhesive between the filled PTFE modified film and the backing steel, thickness 60 micron, valid just for TF-316S and TF-625S
SHAFT For optimal performances, the shaft surface finishing shall be between Ra 0.40 and Ra 1.60 micron,
depending on the applications. Hardness 80 - 160 HB5.
MECHANICAL PROPERTIES
WORKING TEMPERATURE min - 190 °C
max + 260 °C
min - 190 °C
max + 260 °C
min - 190 °C
max + 260 °C
min - 190 °C
max + 260 °C
min - 190 °C
max + 260 °C
min - 190 °C
max + 260 °C
COEFFICIENT OF FRICTION 0.03-0.20 0.03-0.20 0.03-0.20 0.03-0.20 0.03-0.20 0.03-0.20
MAX. SPEED 1.00 m/s 1.00 m/s 0.50 m/s 1.00 m/s 0.50 m/s 1.00 m/s
MAX. STATIC LOAD 250 N/mm2 250 N/mm2 250 N/mm2 250 N/mm2 250 N/mm2 250 N/mm2
MAX. DYNAMIC LOAD
(max. speed)
140 N/mm2
(0.10 m/s)
140 N/mm2
(0.10 m/s)
180 N/mm2
(0.05 m/s)
140 N/mm2
(0.10 m/s)
180 N/mm2
(0.05 m/s)
140 N/mm2
(0.10 m/s)
MAX. DYNAMIC LOAD
(max. speed)
60 N/mm2
(1.00 m/s)
60 N/mm2
(1.00 m/s)
80 N/mm2
(0.50 m/s)
60 N/mm2
(1.00 m/s)
80 N/mm2
(0.50 m/s)
60 N/mm2
(1.00 m/s)
CHEMICAL RESISTANCE
HYDROCARBONS Excellent Excellent Excellent Excellent Excellent Excellent
HYDROCHLORIC ACID (concentrate to 10%) Excellent Excellent Excellent Excellent Excellent Excellent
SULFURIC ACID
(concentrate to 10%)
Excellent Excellent Excellent Excellent Excellent Excellent
METHANE Excellent Excellent Excellent Excellent Excellent Excellent
OXYGEN Excellent Excellent Excellent Excellent Excellent Excellent
SODIUM HYDROXIDE Excellent Excellent Excellent Excellent Excellent Excellent
LIQUID NITROGEN Excellent Excellent Excellent Excellent Excellent Excellent
SOLVENTS Good Good Good Good Good Good

Note: The informaton in this data-sheet is to be considered reliable, but conditons and methods of use, which are beyond our control, may modify the results. The informaton and data contained in this data-sheet are the result of a long and detailed research, however F.lli Paris S.r.l. cannot be considered responsible for any incorrect or incomplete data. Owing to the constant development of the products, we reserve the right to make changes to them without prior notice.