Table 5. Hardness and Moisture Absorption Tests on Plastics (STU 11-2) 







Durometer Read! 



igs^ (Model "D") 



Moisture 

 Absorption (%)!/ 



Plastic Materials 



NCEL No. 















Control (Dry) 



Exposed (Wet) 



Rods 











Delrin 



413 



86 



80 



0.31 



Nylon 



414 



80 



65 



1.48 



Phenolic laminate 



415 



91 



82 



2.28 



Polycarbonate 



416 



86 



80 



0.21 



Teflon 



417 



62 



57 



0.001 



Cellulose acetate 



419 



80 



70 



3.08 



Polyethylene 



420 



52 



50 



0.004 



Extruded acrylic 



421 



91 



80 



0.44 



Polystyrene 



422 



88 



83 



0.05 



Cast acrylic 



423 



93 



85 



0.46 



Pipe 











Polyvinyl chloride 



418 



81 



75 



0.29 



Tubes 











Vinyl 



412 



30 



30 



0.41 



Vinyl 



424 



742/ 



73^ 



0.57 



Vinyl 



425 



74^ 



7A^ 



0.13 



Vinyl 



426 



61 



58 



0.29 



Laminates 











Phenolic 



S-5 



93 



90 



3.77 



Phenolic 



S-7 



93 



89 



2.63 



Phenolic 



S-8 



94 



90 



3.91 



Phenolic 



S-9 



89 



85 



1.70 



Melamine 



S-10 



98 



95 



0.46 



Epoxy 



S-11 



95 



92 



0.19 



Rubber 











Rubber vacuum tube 



411 



- 



- 



1.21 



\j Tested and dried for 2 months in 20% RH and 23°C temperature. 

 "Ij Softer plastics tested v/ith Model "A-2" durometer. 



33 



