Tensile Test Methods for Plastics: ASTM D638 - Specs

Type I

ASTM D638 Specimen Dimensions

Full length,l3

165

Parallel length,l2

57

Gauge length,l1

50

Parallel section width,strong1

13

Thickness,h

7 mm or less
( Recommend 3.2±0.4 mm )

Grip section width,strong2

19

Distance between grips

115

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Type II

ASTM D638 Specimen Dimensions

Full length,l3

185

Parallel length,l2

57

Gauge length,l1

50

Parallel section width,strong1

6

Thickness,h

7 mm or less
( Recommend 3.2±0.4 mm )

Grip section width,strong2

19

Distance between grips

135

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Type III

ASTM D638 Specimen Dimensions

Full length,l3

165

Parallel length,l2

57

Gauge length,l1

50

Parallel section width,strong1

19

Thickness,h

7mm to 14mm

Grip section width,strong2

29

Distance between grips

115

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Type V

ASTM D638 Specimen Dimensions

Parallel length,l2

63.5

Parallel section width,strong1

7.62

Thickness,h

4mm or less

Grip section width,strong2

9.53

Distance between grips

25.4

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  • Five types of specimens
  • Type I is recommended
  • Type II is used if break does not occur within the parallel section of Type I
  • Type V is used for special circumstances, such as testing in a thermostatic chamber
    (In addition, other shapes are specified, such as tube and rod shapes.)

Type IV

ASTM D638 Specimen Dimensions

Full length,l3

115

Parallel length,l2

33

Gauge length,l1

25

Parallel section width,strong1

6

Thickness,h

4mm or less

Grip section width,strong2

19

Distance between grips

65

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