Kynar® 740

Alternative and trade names
PVDF
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Description

Kynar® resins are fluorinated thermoplastic homopolymers.

Outstanding characteristics: chemical resistance, imperviousness to UV, high barrier properties, high purity, good mechanical and thermo-mechanical properties.

Kynar® 740 resin is a standard grade of granules for extrusion of tubes and plaques, compression and transfer molding. This product is ANSI/NSF Standard 61 certified. A powder form is available as Kynar® 741 resin.

This material data has been provided by Arkema Technical Polymers.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyValueTesting StandardConditionComment

Coefficient of friction

0.14 [-]

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ASTM D1894

vs Steel, Kinetic

0.2 [-]

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ASTM D1894

vs Steel, Static

Density

1.77 - 1.79 g/cm³

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ASTM D792

1.78 g/cm³

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ISO 1183

dry

Limiting oxygen index

43 %

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ISO 4589-1/-2

dry

44 %

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ASTM D2863

Moisture absorption

0.015 %

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Sim. to ISO 62

Water absorption

0.01 - 0.03 %

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ASTM D570

0.03 %

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Sim. to ISO 62

Mechanical

PropertyTemperatureValueTesting StandardConditionComment

Compressive strength

68.9 - 103 MPa

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ASTM D695

Elastic modulus

1.4 - 2.3 GPa

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ASTM D638

1.7 GPa

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ISO 527-1/-2

dry

Elongation

20 - 100 %

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ASTM D638

50 %

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ISO 527-1/-2

dry

min. | nominal

Elongation at yield

5 - 10 %

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ASTM D638

7 %

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ISO 527-1/-2

dry

Flexural modulus

1.4 - 2.3 GPa

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ASTM D790

Flexural strength

58.6 - 75.8 MPa

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ASTM D790

at 5% strain

Hardness, Shore D

76 - 80 [-]

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ASTM D2240

Impact strength, Charpy notched

-30 °C

5 kJ/m²

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ISO 179/1eA

dry

23 °C

14 kJ/m²

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ISO 179/1eA

dry

Impact strength, Charpy notched, ASTM

23 °C

96.1 - 214 J/m

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ASTM D256

Impact strength, Charpy unnotched

-30 °C

186 kJ/m²

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ISO 179/1eU

dry

23 °C

244 kJ/m²

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ISO 179/1eU

dry

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Impact strength, Charpy unnotched, ASTM

23 °C

1070 - 4270 J/m

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ASTM D256

Tensile strength

34.5 - 55.2 MPa

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ASTM D638

Yield strength

50 MPa

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ISO 527-1/-2

dry

55.2 - 58.6 MPa

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ASTM D638

Thermal

PropertyValueTesting StandardConditionPressureComment

Coefficient of thermal expansion

0.000119 - 0.000144 1/K

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ASTM D696

0.00015 1/K

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ISO 11359-1/-2

dry

Glass transition temperature

-40.6 - -38.3 °C

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ASTM D7028

-40 °C

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ISO 11357-1/-2

dry

10°C/min

Heat deflection temperature

105 - 115 °C

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ASTM D648

2 MPa

248 °F/hr

105 °C

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ISO 75-1/-2

dry

2 MPa

125 - 140 °C

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ASTM D648

0.45 MPa

248 °F/hr

135 °C

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ISO 75-1/-2

dry

0.45 MPa

Melting point

165 - 172 °C

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ASTM D3418

168 °C

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ISO 11357-1/-3

dry

10°C/min

Relative temperature index, electrical

150 °C

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UL 746B

Relative temperature index, mechanical strength

150 °C

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UL 746B

Specific heat capacity

745 - 958 J/(kg·K)

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DSC

Thermal conductivity

0.17 - 0.19 W/(m·K)

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ASTM D433

Thermal decomposition in air

375 °C

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TGA

1% wt. loss

Thermal decomposition in nitrogen

410 °C

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TGA

1% wt. loss

Vicat softening temperature

135 °C

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ISO 306

50°C/h 50N

Flammability

At thickness 1.6 mm IEC 60695-11-10: V-0, At thickness 0.8 mm IEC 60695-11-10: V-0 and yellow card available

Electrical

PropertyValueConditionTesting StandardFrequencyComment

Comparative tracking index

600 V

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dry

IEC 60112

Dielectric constant

4.5 - 9.5 [-]

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ASTM D150

1KHz

8 [-]

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dry

IEC 60250

1MHz

11 [-]

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dry

IEC 60250

100Hz

Dielectric strength

21 kV/mm

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dry

IEC 60243-1

67 kV/mm

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ASTM D149

Dissipation factor

0.01 - 0.21 [-]

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ASTM D150

100KHz

0.026 [-]

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dry

IEC 60250

100Hz

0.231 [-]

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dry

IEC 60250

1MHz

Surface resistivity

1e+15 Ω/sq

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cond.

IEC 60093

min.

Volume resistivity

2e+14 Ω·cm

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65% RH

ASTM D257

2e+14 Ω·cm

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dry

IEC 60093

Optical

PropertyValueTesting StandardComment

Refractive index

1 [-]

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ASTM D542

sodium D line

Rheological Properties

PropertyValueTesting StandardConditionComment

Melt mass-flow rate

1.5 - 3 g/10min

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ASTM D1238

230°C/5kg

Melt viscosity

1600 - 2200 Pa·s

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ASTM D3835

Melt volume-flow rate

1.1 cm³/10min

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ISO 1133

dry

230°C/5kg

Shrinkage

2 %

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ISO 294-4

dry

2 %

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ISO 294-4

dry

Transverse

Technological properties

Property
Application areas

Chemical Process Industry,Chemical Process Industry - High Purity Piping,Chemical Process Industry - Injection Molding,Chemical Process Industry - Stock Shapes,Conveyor Belts and Pulleys,Monofilaments,Plenum Pipe,Tower Packing,Tubing and Hoses,Photovoltaic / Solar Film

Certifications

Yellow Card

Processing methods

Injection Molding:

  • Melt temperature (°C) ISO 294: 230
  • Mold temperature (°C) ISO 10724: 90
  • Injection velocity (mm/s) ISO 294: 10
  • Pressure at hold (MPa) ISO 294: 13

  • Compression Molding:

  • Molding temperature (°C) ISO 293: 225
  • Molding time (min) ISO 293:3
  • Demolding temperature (°C) ISO 293: 120