Glass transition temperature of cellulose nitrate and B-72

Has anyone tests data on the glass transition temperature of HMG
Cellulose Nitrate as opposed to HMG Paraloid B72? I have spoken with
the makers and they themselves have not carried out such testing
however the consensus of opinion seems to be that HMG Cellulose
Nitrate has a better Glass Transition Temperature than B72 though
B72 is less prone to discolouration during aging. I would like to
know what the glass transition temperature for each of the two
grades is.

Mark Vine
Conservation Resources, England

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                  Conservation DistList Instance 9:73
                    Distributed: Sunday, May 5, 1996
                        Message Id: cdl-9-73-016
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