Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butadiene rubber) are____________________?
Correct answer: A. 50°C and 3 - 4 kg/cm2
- A. 50°C and 3 - 4 kg/cm2
- B. 50°C and 1 kgf/cm2
- C. 250°C and 10 kgf/cm2
- D. 250°C and 1 kgf/cm2
Explanation
Hot SBR is produced by emulsion polymerisation at about 50°C, commonly under a gauge pressure of roughly 3 to 4 kgf/cm². The 250°C choices are far too high for this polymerisation process.
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