Plastics. Determination of residual styrene monomer in polystyrene (PS) and impact-resistant polystyrene (PSI) by gas chromatography1 Scope This International Standard specifies a method for the determination of the residual styrene monomer in polystyrene (PS) and impact resistant polystyrene (PS I) by gas chromatography. It may also be used for the simultaneous determination of other volatile aromatic hydrocarbons in PS and PS I.

— specifications to determine biomethane quality

Where the ranking of criticality involves at least the severity of consequences

They are developed following very extensive observation of available materials breaking under the test conditions and following the use of different impact energies to test materials having different levels of mechanical strength

and the characteristic impedance

The methods apply to systems mounted under the ceiling with or without open air gaps between the panels and the ceiling

The darkness inside coaches may encourage crimes such as thefts

What is BS 6997 – NBR O-ring specification about

It is also intended to be of use to:

Square: outside dimensions up to 800 mm × 800 mm

Tensile test at elevated temperature

Who is BS EN 62621 - Composite insulators used for overhead contact for

BS EN 60974-6 specifies safety and performance requirements applicable to limited duty arc welding and cutting power sources and auxiliaries designed for use by laymen