GENERAL PROPERTIES OF PTFE:

PTFE mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of -100 deg. F to +400 deg. F. (-73 deg. C to 204 deg. C) Mechanical properties are often enhanced by adding filters (see paragraph below). It has excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE is very dense and cannot be melt processed - it must be compressed and sintered to form useful shapes.

FILLED GRADES:-
PTFE's mechanical properties can be enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide and bronze. Generally, filled PTFE's maintain their excellent chemical and high temperature characteristics, while fillers improve mechanical strength, stability and wear resistance.

The properties of 25% glass-filled and 25% carbon-filled PTFE grades are shown below for comparison purposes. There are literally dozens of different filled PTFE products and grades - too many to listed here. Please contact Boedeker Plastics for more information about other filled PTFE products for your application.

TYPICAL PROPERTIES OF PTFE:

 

PRODUCT : GLASS FIBRE REINFORCED FILLED PTFE.
IN-PUT SOURCE : PTFE 
IDENTIFICATION : 01
GRADE : "Carbon"

 

Sr. No.

CHARACTERISTICS

TEST METHOD

(ASTM)

UNIT

TEST VALUE

1. Flowability - - Semi free flow
2. Filler content (W/W) - % 25
3.

Specific Gravity

D4745 Gm/cm2

2.37

4.

Bulk density

D4745 g/I 578
5. Tensile Strength D4745 Kg/cm2 91
6.

Elongation

D4745 % 130
7. Shrinkage D4745 % 4.0
8. Hardness D2240 Shore D 63

 

PRODUCT : PTFE 25% CARBON
IN-PUT SOURCE : PTFE 
IDENTIFICATION : 24 
GRADE : 25% CARBON FILLED PTFE - SF

 

Sr. No.

CHARACTERISTICS

TEST METHOD

(ASTM)

UNIT

TEST VALUE

1. Flowability - - Semi free flow
2. Filler content (W/W) - % 25
3.

Specific Gravity

D4745 Gm/cm2

2.04

4.

Bulk density

D4745 g/I 520
5. Tensile Strength D4745 Kg/cm2 178
6.

Elongation

D4745 % 182
7. Shrinkage D4745 % 1.9
8. Hardness D2240 Shore D 68

 

PRODUCT : PTFE 60% BRONZE
IN-PUT SOURCE : PTFE 
IDENTIFICATION : 03
GRADE : 60% BRONZE FILLED PTFE - SF

 

Sr. No.

CHARACTERISTICS

TEST METHOD

(ASTM)

UNIT

TEST VALUE

1. Flowability - - Semi free flow
2. Filler content (W/W) - % 60
3.

Specific Gravity

D4745 Gm/cm2 3.940
4.

Bulk density

D4745 g/I 1125
5. Tensile Strength D4745 Kg/cm2 188
6.

Shrinkage 

D4745 % 2.1
7. Elongation    D4745 % 260
8. Hardness D2240 Shore D 67

 


TYPE : FC-35 CA

35% Carbon / Graphite filled non free flow compound based on granular PTFE:

 

Properties Typical Values Units
Specific Gravity 2.00 g/cm2
Shrinkage 1.5 %
Tensile Strength 14 MPa
Elongation 90 %
Bulk Density 500 g/ltr.
Hardness 66 Shore "D"
Recommended Processing Conditions
Moulding Pressure 70 MPa
Maximum Sintering Temperature 365 Deg. C.   

 

TYPE : FC-15 GR


15% Graphite filled non free flow compound based on granular PTFE:

 

Properties Typical Values Units
Specific Gravity 2.1 g/cm2
Shrinkage 2.3 %
Tensile Strength 20 MPa
Elongation 220 %
Bulk Density 460 g/ltr.
Hardness 64-65 Shore "D"
Recommended Processing Conditions
Moulding Pressure 50 MPa
Maximum Sintering Temperature 365 Deg. C.   

 

TYPE : FC-15 GL 5 MO

15% Glass plus 5% molybdenum disulphide filled on non free flow compound based on granular PTFE:

Properties Typical Values Units
Specific Gravity 2.24 g/cm2
Shrinkage 2.3 %
Tensile Strength 24 MPa
Elongation 270 %
Bulk Density 530 g/ltr.
Hardness 62 Shore "D"
Recommended Processing Conditions
Moulding Pressure 45 MPa
Maximum Sintering Temperature 365 Deg. C.   

 

TYPE : FC-40 BR


40% Bronze filled non free flow compound based on granular PTFE:

Properties Typical Values Units
Specific Gravity 3.07 g/cm2
Shrinkage 2.5 %
Tensile Strength 26 MPa
Elongation 270 %
Bulk Density 500 g/ltr.
Hardness 67-68 Shore "D"
Recommended Processing Conditions
Moulding Pressure 45 MPa
Maximum Sintering Temperature 365 Deg. C.   

 

TYPE : FC-40 GL

40% Glass filled non-free flow compound based on granular PTFE:

Properties Typical Values Units
Specific Gravity 2.25 g/cm2
Shrinkage 10.9 %
Tensile Strength 14 MPa
Elongation 200 %
Bulk Density 570 g/ltr.
Hardness 65 Shore "D"
Recommended Processing Conditions
Moulding Pressure 65 MPa
Maximum Sintering Temperature 365 Deg. C.   

 

 

 

 

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