Ingredient

Masterbatch formulation

Concentration (pphr)

Quantity (g)

NR, 50^a

1/4

100

Inner tube crumb

3/4

300

Zinc oxide

4.0

16

Stearic acid

1.25

5

Sulphur

2.5

10

TMTD

0.75

3

N330

50

200

Vulkacit H/30

3

12

Vulcanization temperature

Processing parameters

150˚C

Optimun cure time

Mechanical properties

4.9 minutes

Developed material

Manufactured products

Hardness (Shore A)

60.4 ± 0.5

50 to 90

Elongation at break (%)

319 ± 36

300 to 1000

Stress at break (MPa)

3.82 ± 0.64

3 to 20

Modulus 100^b (MPa)

1.42 ± 0.16

1 to 4

Modulus at break (MPa)

1.19 ± 0.10

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