Craig,
Sorry for the late answer I have been traveling.

The first records were made of a lacquer acetate plasticized with castor
oil.  
The next materials used were:
Shellac
Bakelite
Vinsol
Valtie
Vinyl chloride acetate

33-1/3 LP and 45rpm Record Material:
Vinyl records (33-1/3 LP and 45rpm) are made from polyvinyl chloride (PVC). 

Information on record material types was taken in part from 'The Care and
Handling of Recorded Sound Materials' by Gilles St-Laurent Music Division of
the National Library of Canada, January 1996. 

Vinyl chloride is a gas.  PVC is a rigid solid and needs plasticizers to
make it less so.  In the case of cable sheathing a lot of plasticizer is
needed and in many cases those plasticizers are the three phthalates on the
REACH SVHC list!
Bev
RIM


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Cullum
Sent: Thursday, March 12, 2009 5:11 PM
To: [log in to unmask]
Subject: [TN] Friday NTC question: is Vinyl really vinyl

Hi techxperts,
My mind got to wandering again, so here goes:

The contemporary term for what we called "records" (LP's and 45's) is
"vinyl".
But to me something that is vinyl would be a lot less rigid.

So, just what kind of material are records/"vinyl" made of?

Thanks in advance.

Craig Cullum, Engineering Technologist, AMTELCO
e: [log in to unmask]
   [log in to unmask]
f: 608 838 8367
v: 608 838 4194, or 4197, x128

Please visit us at www.amtelco.com

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