Gatke Bearings & Phenolic Laminates: Technical Material Selection Chart

Gatke Phenolic Laminate & Bearing Products

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Material Number

112
(Hydrotex)

113
(Grafitex)

118
(Glissentex)

238

248 TC
(Molytex)

301
(Glissentex)

397

398

400

DESCRIPTION AND STRUCTURE



*EI DuPont Reg. Trademark

Laminated Medium Weave Cotton Fabric

Laminated Medium Weave Cotton Fabric with Graphite

112 with Laminated Teflon* Cloth

Macerated Fine Cotton Fabric

Laminated Cotton Fabric with Moly

Laminated Medium Weave Cotton Fabric with Teflon*

Laminated Glass Fiber Fabric

Laminated Glass Fiber Fabric with Graphite Similar to 125 Grafitex-A

Laminated Glass Fiber Fabric with Teflon*

AVERAGE MECHANICAL PROPERTIES

                  

Tensile (psi)

12000

11000

12000

7000

7000

9500

17000

16500

16500

Compressive (psi)

38000

36000

38000

25000

41000

37000

47000

46500

46000

Shear (psi)

10000

10000

10000

6000

8000

8000

12500

12500

12500

Flexural (psi)

15000

15000

15000

14000

14000

15000

16700

16500

16700

Hardness (Rockwell M)

93

92

90

115

85

90

103

103

101

Impact (Izod)

5.7

5.7

5.7

2.2

3.2

5

9.9

9.8

9.9

AVERAGE PHYSICAL PROPERTIES

                  

Density (oz/In^3)

.788

.787

.78

.788

.787

.789

.820

.820

.82

Specific Gravity

1.370

1.380

1.370

1.370

1.380

1.370

1.430

1.430

1.43

Coeffieciant of Friction**

                  

Elastic Modulus
In Compression (psi)

850,000

850,000

850,000

1,000,000

850,000

800,000

1,100,000

1,000,000

1,100,000

Coeff.Therm.Expans,("/°F)

1.3 x 10^4

1.3 x 10^5

1.3 x 10^5

1.95 x 10^5

1.3 x 10^5

1.3 x 10^5

1.0 x 10^5

1.0 x 10^5

1.0 x 10^5

Thermal Conductivity
(BTU/FT^2/HR/FT/ °F)

.29

.29

.29

1.94

.29

.29

.21

.23

.21

Dielectric Strength (V/mil)
Short Time

50 to 400

30 to 300

50 to 400

180 to 300

10 to 150

50 to 400

10 to 200

10 to 150

10 to 150

Step by Step

30 to 275

20 to 200

30 to 275

100 to 270

10 to 100

30 to 275

10 to 100

10 to 75

10 to 75

Moisture Absorbtion (%)

1.5

1

1

2.2

1.2

1.5

.62

.62

.62

GENERAL APPLICATION DATA

                  

Similar to NEMA or ASTM Grade

C

CG

        

G-3

G-3

G-3

PV (Dry)***

20000

35000

80000

20000

60000

80000

30000

40000

80000

PV (Water Lubricated)***

75000

100000

130000

75000

120000

130000

80000

100000

130000

Chemical Resistance (Immersed)

Fair

Fair

Good

Fair

Fair

Good

Excellent

Excellent

Excellent

Recommended PH Range

4 to 9

4 to 9

3.7 to 9

5 to 8

5 to 8

4 to 9

2 to 11

2 to 11

2 to 11

Temperature Range (°F)

-80 to 250

-80 to 250

-80 to 250

-100 to 330

-80 to 230

-80 to 250

-80 to 550

-80 to 550

-80 to 550

Poisson's Ratio

.4

.4

.4

.4

.4

.4

.4

.4

.4

NOTE: We believe that the information in this guide to be the best currently available and is offered as such. Scan-Pac makes no guarantee of results and assumes no obligation or liability whatsoever for this data.

**Static: 0.2 to 0.5, Dynamic: 0.1 to 0.3

***PV values (psi X fpm) are an approximate guide only and material suitability should be verified through testing under actual working conditions. Speed is a more critical factor than load. Higher speeds generate more heat which must be dissipated by lubrication since the materials are all heat insulators. For static loading use a safety factor of 3. Therefore, design loading should not exceed 1/3 of the compressive strength.


Gatke tube is available in diameters from 1/2" to 35". Flat sheet is available in sizes up to 30" X 60" and in thickness from 1/16" to 4". Multiple sheets can also be bonded together if larger thicknesses are needed.

Application data required for specifying Gatke material:
Maximum Operating Temperature
Load (psi)
ID and OD Dimentions of bearing or bushing (note: 28" maximum length)
Dry or Lubricated
PV or Rotational speed (fpm) if PV is not known

Recommended finish of mating surfaces:
60 to 125 RMS for static conditions
10 to 50 RMS for dynamic conditions