Document gRn11nRDpbRYoDLavQrqz9Da

f F. T. Petersen, DHQ March 20, 1964 cc J. B. McCarty, DHQ * K. J. Whalen, DHQ R. T. Hacks. REC E. G. Willccx. DHQ D. MacDonald, Manvllle DHQ Stelehek, Denison E. Hesse, Denison Acetone Test Method - PVC Pipe Your letter March 9, 1964 Our comment* on the test method changes for PVC acetone are as fellows: I. Test Temperature (75 to 80 F Test temperature checks show floor temperatures vary from 55 F. to 80 F- In order for us to hold the acetone to a minimum temperature of 70 F., we investigated (a'> placing the acetone at the base of the extruder and using the extruder heat. Safety requirements ruled this out b construction of n central production acetone temperature bath for all machine n.cetcne test samples. Cost approximately $150. (items 1 - 2 . All acetone samples presently are saved and checked by Quality Control. If failure occur?, Q. C. checks production sheets for disposition of production during the failure period. Re checks are run on the dimensional samples from the pro duction bundles. These re-tests are run under laboratory conditions (items 3 - 4% When failure shows on floor, we generally confirm ia laboratory. The degree of flacking is the only discernible difference. Sectioning of all acetone samples We do not feel this is required. Our small diameter 160 psi pipe is run on No. 5, 2 1/2 Prodex. We have never had a failure either as extruded or sectioned. In fact, some pipe has been left in acetone for long periods at 730 F. with no failure shown. We feel that the additional labor in filing down samples on less than . 125 wall (one each hour; is not warranted in our situation. The reason for filing down samples is to remove the skin which could have been fused by die heats only. When rtaualsg MTC 010633 F. T. Petersen, DHQ Page #2 3-20-64 small (1/2 - 2") 160 PVC on No. 5, the melt comes from the screw work. Out die heats are run low in temperature. Filing down samples with less than . 125" wall to . 0625" leaves out 1/2 -11/4 160 psi pipe, since these walls are . 060 to . 064". If 1 1/2 and 2" are filed down to . 0625", we find the sample will split. We do not consider this a failure. On all sections above . 125" wall we agree the wall should be removed. >, Vo!viler - Franklin by R, IJL Hutchinon MTC 010634 NlTC 010635