Properties of matter ( motion picture) :  plastics and rubbers / 
Educational Foundation for Visual Aids. 
 - London :  Educational Foundation for Visual Aids,  1967 
 - 1 film reel ( 20 min.) :  sd., col. ;  16 mm. + notes. 
<br/><br/> Backup available in VHS 1/2 in.  Summary: Sir Lawrence first compares naturally and artificially produced plastics and describes their structure. The constitution of rubber is desribed, it natue being illustrated experimentally and with models. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Matter--Properties.