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What are A3 Hydorcarbons and modified Alcohols?

What are A3 Hydrocarbons & Modified Alcohols

The term comes from a German Federal Government Directive, known as the 'VbF' Directive, which classifies solvents according to their flashpoint. Class A3 solvents have a flashpoint in the range 55-100C and include isoparaffins and modified alcohols (alkoxy propanol). These chemicals have excellent solvency but must be used in specially designed equipment working under vacuum in order to suppress their flammability.