Normas ISO

Diagrams for the chemical and petrochemical industry-- Part 1: Specification of diagrams

Diagrams for the chemical and petrochemical industry-- Part 2: Graphical symbols

Raw optical glass -- Resistance to attack by aqueous alkaline solutions at 50 degrees C -- Test method and classification

Surface active agents -- Determination of stability in hard water

Industrial plate screens -- Specifications and test methods

Metallic butterfly valves for general purposes