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The plastic saniple which you submitted is unlike any plastic'material we know. t

It is thermoplastic but its flow-point is 305°-320C. which exceeds the flow-point of any comuon American theroplastic resin. It, is unaffected by autoclaving, at 15 psi for 1/2 hour. Concerning flammability,. it continues to burn without dripping after removal fron the source of ignition.

The material is hard and sorewhat brittle suggesting that it contains little or no plasticizer. Its density is about 1.19. ;:

It is waterproof. No attempt was made to measure its resistance to moisture vapor although it is assumed it would have a measurable moisture vapor transfer rate.

i It is insoluble in water, carbpn tetrachloride, ethyl alcohol,ethyl ether, and nitric acid. It dissolves inc oncentrated Sulphuric Acid without charring and is soluble in Acetone, .Benzene, Chloroform, and Ethyl Acetate.

Beilstein test for halogen was negative indicating that it is not a polymerized organic' chloride such as polyvinyl chloride or polyvinylidene chloride. :

Lirht transnission of the unpolished sample from 3500 A° to 65o0 A° is nearly constant, but transmission drops rapidly be-: tween 3250 A° and 2850 A°. approachingopacity.

H-B16

MEMO

A(12/5/1x) Date 10/30/51

Answering Your Mamo

SubjectPLASTIC SALiPLUS