What describes Diluent Type B?

• A. Organic liquids with BP between 60°C and 150°C, FP >= 5°C; may desensitize peroxides if BP >= SADT+60°C
• B. Organic liquids with BP above 150°C
• C. Liquids with BP 0°C
• D. Gaseous diluents

Answer: (A)

Diluent Type B refers to a class of liquid organic diluents used to desensitize organic peroxides. The defining properties are that the diluent must be a liquid with a boiling point between 60°C and 150°C and a flash point of at least 5°C. A practical detail is that such diluents can help desensitize peroxides when their boiling point is sufficiently high relative to the peroxide’s SADT (Self-Accelerating Decomposition Temperature), specifically when BP is at least SADT + 60°C. This combination of boiling-point range, ignition safety (flash point), and the potential for desensitizing peroxides matches the description in the option, making it the correct choice. The other options fail because they describe liquids outside that BP range or describe gaseous or very low-boiling-material diluents, which do not fit Type B.