DFG-120 & DFG-130 Guide Tapes

DFG-120&DFG-130 guide tapes:
Due to its excellent low friction, corrosion resistance and thermal stability, PTFE is widely used in friction parts and obturators; especially it can be used in corrosive mediums, and no other metallic or nonmetallic material can. As a professional factory processing PTFE, we are engaged in the research about its modification and process. To meet the guide bearing requirements of pneumatic/hydraulic cylinders under working condition of difficult lubrication, oil-free lubrication, and high lateral pressure, we have developed several kinds of DFG guide tapes of different formulas, which have been applied in the pneumatic/hydraulic cylinders’ guide ring and support ring on compressors, cranes, loaders and other various construction machines.

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Product Details

Material Properties:

1 With high structure strength, it can endure high lateral and reversed stresses, so can guarantee the piston or piston rod’s smooth running, when is used as the pneumatic/hydraulic cylinder’s guide seal.

2 With excellent wear resistance, the pneumatic/hydraulic cylinders equipped with material will show outstanding wear-resistant, antifriction, and adhesive resistant performance under dry friction, boundary lubrication, and in liquid medium of less lubricity.

3 With certain degree elasticity and compliance, it can stand between two metallic friction pairs submissively, with excellent sealing performance and good abrasion resistance for the two mutually abrading metallic surfaces.

4 With strong heat resistance, it can be used under temperature from -120℃ to + 120℃ for long term.

5 With abroad applicability and convenient usage, it can meet the guidance sealing requirements of various type and nonstandard hydraulic or pneumatic systems’ pistons and piston rods. And you can cut it into various lengths during assembly.

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DFG Product Type

Product Type

Color

Applicability and main characteristics

DFG-120

Black

Due to abrasive wear resistance property, notable wear resistant and thermo-mechanical properties, the material can give good guidance sealing function to the pumps, machines, and valves in high temperature steam and water, or in corrosive mediums.

DFG-130

Light green

Due to its outstanding dimensional ability, load capacity, elasticity, and thermo-mechanical property, and certain abrasive-wear characteristic, the material can be made into guider supporting parts working under middle-high pressure and higher temperature   (from -120℃ to +120℃).


Technical Parameters:

Material type

Density (g/cm3)

Linear thermal expansion factor (x10-5)

Tensile strength
(MPa)

Elongation
(%)

Compressive strength
(MPa)

Bending Strength
(MPa)

Impact strength without Notch
(KJ/m2)

Friction and wear properties (dry friction)

Heat distortion temperature
0.4Mpa (℃)

Coefficient of friction

Wear loss (mm)

40-120℃

DFG-120

2.5-2.6

7.0-8.5

17-20

>100

30-35

20-25

>15

0.12-0.16

<2.6

60-65

DFG-130

3.1-3.5

5.8-7.5

20-25

>125

40-50

30-10

20-25

0.20-0.25

6.5

60-70


Product assembly:

As a kind of soft tape used in pistons or piston rods’ guidance seal, it can guarantee the balance movement of pistons or piston rods under lateral pressure, avoid direct contact and abrasion between metallic pistons/piston rods and cylinder body. For its work ask the tape bring no creep deformation under pressure to keep good guiding and supporting performance, the structural design between the tape and the cylinder, between the tape and the piston/piston rod are of much importance. The typical structural design is shown in Table 1 and Table 2. Generally, use those flat guide tapes who have “Rectangle” geometrical shape, and their thickness shall equal to the 0.05mm negative tolerance of summation of the gap length between pistons/piston rods groove, as h=H-0.05 mm. And the guide tape’s width shall equal to groove depth -0.1mm. We recommend 45°or 60°bevel lap joints to connect the tapes.

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Product Specifications:

Width (mm)

TOL (mm)

H (MM)

TOL (mm)

Length (m)

6.1

0/-0.20

2.5

0/-0.05

10.5

7.9

0/-0.20

2.5

0/-0.05

10.5

19.5

0/-0.20

2.5

0/-0.05

10.5

14.8

0/-0.20

2.5

0/-0.05

10.5

19.5

0/-0.20

2.5

0/-0.05

10.5

24.5

0/-0.20

2.5

0/-0.05

10.5

29.5

0/-0.20

2.5

0/-0.05

10.5

Width (mm)

TOL (mm)

H  (MM)

TOL (mm)

Length (m)

6.1

0/-0.20

2.5

0/-0.05

10.5

7.9

0/-0.20

2.5

0/-0.05

10.5

19.5

0/-0.20

2.5

0/-0.05

10.5

14.8

0/-0.20

2.5

0/-0.05

10.5

19.5

0/-0.20

2.5

0/-0.05

10.5

24.5

0/-0.20

2.5

0/-0.05

10.5

29.5

0/-0.20

2.5

0/-0.05

10.5

 

Patterns and chamfers can be compressed on DFG-130 guide tapes according to the specific requirements from the customers, we can also manufacture other sizes.



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