Document 2R5JjLEd7yb36VY4LjoK5NM3N
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Interoffice Communication
To : A. F. Gallagher
From
Jantes Barton
Date October 21, 1974
Subject : Residual VCM in Bagged Resin VS Storage Time
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1250 pounds of tail peaked 5385 resin recovered at 170F and 171' Hg vacuum was weathered in the warehouse under normal warehouse ventilation conditions for 48 hours. During this 48 hour period three sets of samples were taken; one initially, and one each at 24 hours and 48 hours.
The initial bagged resin had an average residual VCM content of 644 ppm. At the end of 24 hours this content had dropped to an average of 152 ppm. At the end of the 48 hours the average was 166 ppm. The 24 hour and the 48 hour readings are basically the same; within the analytical tests accuracy.
The following 'is a summary of all the bagged resin vs storage time data accumulated to date.
VCM, ppm
5446^
5385
(3) 5446
(4) 5385
Ititial
810 328 62
644
Final
24 48 10
*
Storage Time (hours)
138
145
48
166 48
1 Standard 5446 resin weathered in a ventilated shelter. The readings
are VCM levels in the atmosphere inside the shelter and were taken with an OVA meter. (Graph #1)
2 5385 resin tail peaked to (157F) and weathered inside a storage shelter
The shelter was purged to the surrounding atmosphere every 24 hrs. These readings are VCM levels in the atmosphere inside the shelter and were taken with an OVA meter (Graph #2)
3 This 5446 resin is our normal steam stripped resin. The resin was weathered in the warehouse under normal warehouse ventilation conditions. The concentration readings are actual residual VCM run by GC analysis. (Graph #3)
^Our normal tail peaked 5385 resin recovered at 170F and 17,! Hg vacuum. The resin was weathered in the warehouse under normal warehouse ventilation conditions. The concentration leadings are actual residual VCM run by GC analysis. (Graph #4)
VAB.0001042609
Residual VCM In Bagged Resin VS_ Storage Time Page 2
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Attached graphs #1, #2, #3, and #4 show that the largest amount of weathering occurs the first 24 hours after bagging. This happens whether the resin is tail peaked or steam stripped. The initial con centration will, however, effect the amount of VCM in the warehouse atmosphere. Ventilation of the warehouse should be based on the amount of less than 24 hour old product stored.
Attached graphs #3 and #4 represent the types of material currently being produced at the Aberdeen plant, steam stripped and tail peaked (170F). Assuming this one sample is typical of the one present production, steam stripped resin will be the only type that can be shipped without some period of weathering using a standard of 100 ppm residual VCM in the final product. The laboratory is currently running residual VCM by GC analysis on the finished resin shipped to the customers. The laboratory program will varify which type of resin steam stripped or tail peaked will meet the 100 ppm standard.
No further work will be done on the bagged resin vs_storage time project until further data is received from the current laboratory program.
James Barton Process Engineer
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GWP, RWS, DFJ, LHB, JES, FJS, DSC, WRS
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