Page 302 - Handbook of Plastics Technologies

ELASTOMERS

4.94 CHAPTER 4

TABLE 4.14 Example Rubber Compound Recipes
Natural rubber extrusion EPDM vacuum tube
compound
SMR-5 100 EPDM (Keltan 5508) 100
Stearic acid 0.5 N-650 black 170
Zinc oxide 5
Octylated diphenylamines (anti- 2 Paraffinic process oil (Sunpar 100
degradant) 2280)
Processing aid 2 Wax (A-C Polyethylene 617) 5
Extender oil 15 Zinc oxide 5
Vulcanized soybean oil (Neophax 30 Stearic acid 1
A)
Carbon black N-550 32 MBT (accelerator) 1
Soft clay 40 TMTM (accelerator) 1.6
Sulfur 2.75 Sulfur 1.5
N-t-Butylbenzothiazolesulfena- 1
mide (accelerator)
Tetramethylthiuram disulfide 0.2
(accelerator)
Cure 10 min at 153°C Cure 20 min at 160ºC

NR-BR-SBR tread Chloroprene v-belt
SBR 1204 50 Neoprene GRT 100
BR 1203 20 N550 carbon black 30
NR-SMR5 30 Reinforcing silica (Hi-Sil 233) 15
Carbon black N-339 40 Octylated diphenylamines (anti- 2
degradant)
Hi-Sil 210 (treated silica) 20 MBTS (accelerator) 0.5
Extender oil 17 Novalak resin (SRF 1501) (adhe- 2
sion promoter)
Zinc oxide 3 Methylated melamine formalde- 6
hyde resin (Cyrez 963) (adhe-
sion promoter)
Stearic acid 1 Stearic acid 2
6PPD (antidegradant) 1.5 Magnesium oxide (Maglite D) 5
Sulfur 1.5 Zinc oxide 5
t-Butylbenzothiazolesulfena- 2
mide (accelerator)
Cure 15 min at 150°C Cure 40 min at 155°C

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