Thickness of diazo film stock

This query is posted on behalf of Myriam McCormack
<myriam.mccormack<-a t->nlc-bnc< . >ca>

    It appears that there are fewer companies currently
    manufacturing .7 mil film for use as diazo microfiche.  Many
    companies are now using film that is .5 mil and our service
    bureau has suggested that we could switch without any loss of
    quality or durability.

    Can someone relate their experiences with the use of .5 mil film
    stock. Is the .5 mil diazo film as durable as the .7 mil film?
    Does it make any difference at all?

    Is there an ANSI standard describing the optimum thickness for
    diazo film stock?

Pam Bjornson

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                  Conservation DistList Instance 11:9
                  Distributed: Tuesday, July 15, 1997
                        Message Id: cdl-11-9-011
                                  ***