A-HV

Fluoroelastomers

Technical Information
Introduction

Processing

Viton A-HV is a high viscosity fluoroelastomer dipolymer
that provides vulcanizates with high tensile strength andbest resistance to compression set compared to other
Bisphenol AF curable types.

Mixing™

Features• Bisphenol AF and Diamine Curable• High Tensile Strength• Low Compression Set
Typical applications include compression molded seals,
O-rings, gaskets, and oil-field parts, such as packers.
Product Description
Chemical Composition

Dipolymer of hexafluoropropylene,
vinylidene fluoride

Physical Form

SheetAppearance

White to tanOdor

Negligible

Mooney Viscosity, ML 1 + 10
at 149 °C (300 °F)

100Specific Gravity

1.82

Storage Stability

Excellent

Fluorine, %~66Curing Systems for Viton™ A-Types
The A-types of Viton™ can be cured with Viton™ Curative
Masterbatches (No. 20 and 30), Curative No. 50, orwith diamines—Viton™ Curative Nos. 1 (VC-1) or 3(VC-3). Typical formulations and physical properties forcompounds using Curatives No. 20, No. 30, and No. 50
are found in Table 1. A comparison of A-HV to A-500 andA-700 can be found in Table 2. For additional information
on curing Viton™, see technical bulletin “Viton™ Curatives
No. 20, No. 30, and No. 50.”

Perhaps the most important aspect of mixing Viton™ is touse equipment free of contamination from other polymer
mixes. Residual oils and sulfur or sulfur-containing
chemicals can have ruinous effects on mixing and curing
characteristics of Viton™ compounds. Viton™ compounds
should be mixed on a mill or in an internal mixer that has
adequate cooling capacity; not only to prevent stock
scorch, but also to prevent sticking of the mix to rolls orrotors. All powdered ingredients should be premixed—thisensures good dispersion and prevents sticking, whichoccurs if magnesia is added by itself early in the mix. The
use of Viton™ Curative No. 1 (VC-1) results in fairly scorchy
compounds. For this reason, VC-1 should be added lastwhen mill mixing and on the drop mill when using aninternal mixer.
Depending on the acid acceptor and filler systems used,
re-milling compounded stock after a minimum of 24 hr
often improves physical properties of vulcanizates.
ExtrudingHigh viscosity A-types like A-HV typically provide a betterextrudate surface when processed through a hot die—
100–140 °C (212–284 °F). The use of 1–1.5 phr of aprocess aid, such as VPA No. 2 or carnauba wax, markedly
improves the surface and definition of extrudates. Whenusing a process aid, it is best to keep the feed zone cool
relative to the die and head areas of the extruder to avoid
stock slippage and loss of feed.
CuringCompounds may be cured at temperatures as
low as 160 °C (320 °F); but, when using Curative
Masterbatches, 170 °C (338 °F) is a minimum
temperature to use if practical cure times are desired.
These are guidelines for a simple, compression-molded
part; in transfer molding or compression molding, where
the stock flows significantly, enough shear heat mayViton™

Fluoroelastomers

result to shorten “expected” cure times significantly. To
attain maximum physical properties, cured parts of Viton™
must also be oven post-cured for 24 hr at a temperature
between 200–260 °C (392–500 °F). In general, property
values will reach 80–90% of maximum in 12 hr at 232 °C(450 °F). Parts thicker than 6 mm (0.25 in) should be step
post-cured to avoid internal fissuring. Starting at 125 °C(257 °F), the heat can then be increased hourly to thefinal desired post-cure temperature. For more information,
see technical bulletin “Viton™ Fluoroelastomers—Oven
Post-Curing of Parts.”
Safety and Handling
Before handling or processing Viton™ A-HV, read andbe guided by the suggestions in the technical bulletin,“Handling Precautions for Viton™ and Related Chemicals.”

Table 1. Viton™ A-HV Compared to E-45
Compound #CSG0244-10

CSG0244-11

Viton™ A-HV

97.5

94.2CSG0244-06

CSG0244-07

97.5

94.2

Viton E-45
™

N-990

3030

3030

Calcium Hydroxide

6666

Magnesium Oxide

3333

Viton™ Curative No. 50

2.52.5Viton Curative No. 30

44Viton Curative No. 20

1.8

1.8

™
™

139139139

139

Compound Mooney Viscosity, ML1+10, 121 °C (250 °F)
Init(MU)

221

217

124

131

ML(1+10)

(MU)

182

182

6465

Mooney Scorch, Small Rotor, 121 °C (250 °F), 30 min Test
ML(MU)9998

3436

T2(min)1.22

0.39>30>30

T5(min)>30

1.22>30>30

ML(dNm)

5.29

5.29

1.13

1.23

MH(dNm)

34.7

34.2

28.7

26.0

ts2(min)

0.95

0.88

1.11

1.01

T'50(min)

1.52

1.45

1.45

1.39

T'90

(min)

2.10

2.07

2.31

2.30

T'95

(min)

2.53

2.50

2.90

2.84

MDR at 177 °C (351 °F), 10 min, 0.5° Arc

Vulcanizate Properties
Press-Cured 10 min at 177 °C (351 °F), Oven Post-Cured 24 hr at 232 °C (418 °F)
Original Properties at 23 °C (73 °F)—No Post-CureHardness(Shore A)

7374

74

74

10% Modulus

(MPa)

1.06

1.04

1.15

1.01

25% Modulus(MPa)

1.821.87

1.88

1.78

50% Modulus

(MPa)

3.03

3.19

2.77

2.79

100% Modulus(MPa)

6.06

6.14

4.73

5.01

Tensile at Break(MPa)

12.3

12.2

9.5

10.6

Elongation at Break(%)

216

208

234251

Die B Tear(kN/m)

40.5

42.1

41.8

40.4

Die C Tear(kN/m)

18.3

19.2

19.8

19.9

2

continued

Viton™

Fluoroelastomers

Table 1. Viton™ A-HV Compared to E-45 (continued)
Compound #CSG0244-10

CSG0244-11

CSG0244-06

CSG0244-07

Original Properties at 23 °C (73 °F)—Post-CuredHardness(Shore A)

7776797710% Modulus

(MPa)

1.11

1.12

1.34

1.14

25% Modulus

(MPa)

2.02

2.08

2.19

2.01

50% Modulus

(MPa)

3.52

3.72

3.43

3.35

100% Modulus

(MPa)

8.05

8.44

6.86

7.06

Tensile at Break

(MPa)

16.6

16.1

11.1

14.1

Elongation at Break

(%)

187

175

152

183

Die B Tear(kN/m)

46.4

46.3

47.4

47.8

Die C Tear(kN/m)

19.7

20.0

20.8

20.4

Hardness(Shore A)

74

76

80

79

Hardness(Pt. Change)

–20

12

Hot Air Aged 72 hr at 275 °C (527 °F)

100% Modulus

(MPa)

5.5

5.7

4.45.1100% Modulus(% Change)

–32

–33

–36

–28

Tensile at Break(MPa)

12.2

11.8

10.7

10.5

Tensile at Break(% Change)

–26

–27

–4–26

Elongation at Break(%)

211

216

243

229

Elongation at Break(% Change)

13236025

Hardness(Shore A)

78

80

84

84

Hardness(Pt. Change)

2

45

7

100% Modulus

(MPa)

4.5

5.3

4.8

5.3

100% Modulus(% Change)

–44

–37

–31

–25

Tensile at Break(MPa)

8.8

8.2

7.8

7.8

Tensile at Break(% Change)

–47

–49

–30

–45

Elongation at Break(%)

216

189

192

178

Elongation at Break(% Change)

16827–2Hardness(Shore A)

7980

8484Hardness(Pt. Change)

2567100% Modulus

(MPa)

5.9

6.5

5.2

6.0

100% Modulus(% Change)

–27

–24

–24

–16

Tensile at Break(MPa)

11.1

10.6

9.9

9.9

Tensile at Break(% Change)

–33

–34

–11–30Elongation at Break

(%)

198

190

209

198

Elongation at Break(% Change)

6937

970 hr at 150 °C (302 °F)(%)

46535665

70 hr at 200 °C (392 °F)

(%)

6471

7280

70 hr at 200 °C (392 °F)(%)

16161819

70 hr at 230 °C (446 °F)(%)

32344040

Hot Air Aged 168 hr at 275 °C (527 °F)

Hot Air Aged 504 hr at 250 °C (482 °F)

Compression Set, Pellet, Method B, No Post-Cure

Compression Set, Pellet, Method B, Post-Cured3

Viton™

Fluoroelastomers

Table 2. Viton™ A-HV Compared to A-700 and A-500
A-HVA-700

A-500

Viton™ A-HV

97.5——Viton™ A-700

—

97.5

—

Viton A-500——97.5MT Black (N-990)

303030™

Maglite D333

Calcium Hydroxide

666

Viton™ Curative No. 50

2.5

2.5

2.5

966448®

Mooney Scorch, MS at 121 °C (250 °F)
Minimum Viscosity, units
Time to 1 pt rise, min161312Time to 2 pt rise, min

26

—

—

Time to 5 pt rise, min———Time to 10 pt rise, min

—

—

—

Minimum Viscosity, ML, N·m

0.6

0.3

0.2

Scorch Time, ts2, min

0.7

0.8

0.9

Maximum Torque, MH, N·m

3.8

3.2

3.1

50% Cure, M50, N·m

2.2

1.7

1.6

Time to 50% Cure, t’50, min

1.4

1.3

1.3

90% Cure, M90, N·m

3.5

2.92.8Time to 90% Cure, t’90, min

2.2

1.9

2Pts rise to 30 min
MDR at 177 °C (351 °F), 0.5° Arc, 6 min Motor

Slabs Cured 10 min at 177 °C (351 °F) and Post-Cured 24 hr at 232 °C (450 °F)
Stress/Strain—Original at 23 °C (73 °F)
100% Modulus, MPa

7.7

6.6

6.4

Tensile Strength at Break, MPa

15.8

13.6

13.9

Elongation at Break, %

195

210

220Hardness, Durometer A

727373

21.4

23.7

22

100% Modulus, MPa

8.1

7.3

6.8

Tensile Strength at Break, MPa

15.4

15.2

14.9

Elongation at Break, %185200

220Hardness, Durometer A767476

100% Modulus, MPa

7.37.0

6.3

Tensile Strength at Break, MPa

13.8

13.6

14.1

Elongation at Break, %175

190

220Hardness, Durometer A

737375Original, ASTM, Die C Tear, Tested at 23 °C (73 °F)
kN·m, pli
Stress/Strain at 23 °C (73 °F)—After Aging 70 hr at 200 °C (392 °F)

Stress/Strain at 23 °C (73 °F)—After Aging 168 hr at 200 °C (392 °F)

continued

4Viton™

Fluoroelastomers

Table 2. Viton™ A-HV Compared to A-700 and A-500 (continued)
A-HVA-700

A-500

100% Modulus, MPa

8.5

7.4

7.1

Tensile Strength at Break, MPa

15.9

15.2

15

Elongation at Break, %

180

195

210

Hardness, Durometer A

75

75

77

100% Modulus, MPa

8.3

7.4

7.1

Tensile Strength at Break, MPa

16.4

14.1

15.6

Elongation at Break, %

175

175

210

Hardness, Durometer A

75

74

78

100% Modulus, MPa

7.8

6.7

6.3

Tensile Strength at Break, MPa

15.1

13.3

12.7

Elongation at Break, %

205

195

210

Hardness, Durometer A

727374% Change in Volume224

Stress/Strain at 23 °C (73 °F)—After Aging 70 hr at 250 °C (482 °F)

Stress/Strain at 23 °C (73 °F)—After Aging 168 hr at 250 °C (482 °F)

Stress/Strain at 23 °C (73 °F)—After Aging 70 hr at 200 °C (392 °F) in IRM-902 OilStress/Strain at 23 °C (73 °F)—After Aging 168 hr at 23 °C (73 °F) in 85% Reg. Fuel °C/15% Methanol
100% Modulus, MPa

5.6

4.8

4.5

Tensile Strength at Break, MPa

87.1

7.1

Elongation at Break, %140150160Hardness, Durometer A

646262% Change in Volume28292970 hr at 150 °C (302 °F)

58570 hr at 200 °C (392 °F)

111111168 hr at 200 °C (392 °F)

15181922 hr at 232 °C (450 °F)

71211–14 (6.8)–16 (3.2)–16 (3.2)

Compression Set, Method B, O-Rings, %Temperature Retraction
TR-10, °C (°F)

5

Viton™

Fluoroelastomers

Test Procedures
Property Measured

Test Procedure

Compression Set

ASTM D395, Method B (25% deflection)

Compression Set, O-Rings

ASTM D1414

Hardness

ASTM D2240-91, durometer A

MDR (moving die rheometer)

ASTM D5289

Mooney Scorch

ASTM D1646, small rotor at 121 °C (250 °F)

Mooney Viscosity

ASTM D1646, large rotor at 121 °C (250 °F)

Property Change After Heat Aging

ASTM D573

Stress/Strain Properties
100% Modulus
Tensile Strength (T-B)
Elongation (E-B)

ASTM D412, pulled at 8.5 mm/sec (20 in/min)

Tear Die B and Tear Die C

ASTM D624

Temperature Retraction

ASTM D1329

Volume Change in Fluids

ASTM D471

Note: Test temperature is 23 °C (73 °F), except where specified otherwise.

For more information, visit Viton.com
The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

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Replaces: H-71131-02
C-11717 (9/20)