Method of specifying general purpose polystyrene (PS) moulding and extrusion material / 
British Standards Institution. 
 - 5 pages ;  33cm. 
 - British standard ;  BS 1493 : 1987 .
 - British standard ;  BS 1493 : 1987 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Polystyrene--Standards.