Document qaNVm7zDdwnvMgxwD1Qz2v8r5

Interoffice Communication To F. Kennedy From w. R. Sorenson Date April 11, 1974 Subject VCM in Resin and Downstream Materials We have recently had analyses of VCM in resin and downstream materials to get a fix on the carry-through of VCM from start to finish of PVC pro cessing. This is not a final statement, obviously. It is apparent that the VCM level in any material is closely tied to its age, so is thus a moving target. The time spans in the following are Indicated where something about them is known. All analyses were done between March 25 and 29. No quantitative relationships between original resin and derived materials is possible at this point. This initial summary is to give some idea of the magnitude of the problem as it typically exists and with some detail of the aging or other factors that could influence the VCM content. A. Resin-into-Pipe ppm, VCM 1. Colonial (Federal Mogul), Tampa, Florida a. In-plant dry blend b. Conoco 89030 (CONX 45307, shipped 2/18/74) c. Pipe 120 11 67 Samples were collected at Colonial on March 20. Samples a and c were taken immediately after manufacture. The drop temperature from the blender is 240F. The pipe sample, c, was being extruded from in-plant dry blend, very close in time to the production of dry blend, a. Dry blend b was made from resin of unknown VCM level, but conservatively can be estimated at 500 ppm. 2. Davis Water arid Waste, Thomasville, Georgia a. Conoco 5385 (PTLX 41600, shipped from Aberdeen on 2/18/74) b. In-plant dry blend (DC-1) c. Conoco 89030 (CONX 45268, shipped 3/7/74) d. Pipe from b 150 0 5 15 Samples were collected March 22; b and d were sampled as made and were close together in time. Davis drops at 220F from their blender. The very low level of VCM in Conoco dry blend is con sistent with the Colonial results. The higher level of 65610300 2* VRD 0062013960 F. Kennedy April 11, 1974 Page 2 VCM in pipe may reflect the variability in dry blend; no VCM level from a small sample can be regarded as guaranteedly applicable to a larger mass. Analysis errors are also possible. 3. CarIon, Oklahoma City ppm, VCM a. Dryer, M501 (OkC) b. Dryer, M502 (OkC) c. Resin, tower 1 d. Resin, tower 2 e. Dry blend (C-250), tower 1 f. Dry blend (C-250), tower 2 g. Pipe from C-250, extruded 3/20 580 550 530 520 75 110 18 (100)* (147)* (24)* The resins from Carlon were taken from the feed to the blender. The tranfer from the resin plant causes little VCM loss prior to use. Blending and extrusion resulted here in about equal percentage decreases in VCM content. E through g were taken freshly as manufactured; the resins were taken shortly before e and f were made. Date collected: March 22.- Note that fresh dry blend here has much higher levels of VCM than that made at Aberdeen and received at Colonial and Davis starting probably from higher VCM in the resin. The shipping and handling of dry blend must involve enough time and air blowing to usefully dissipate VCM. *C-250 is ca. 75% PVC, the remainder being mainly CaC03 filler. The numbers in parentheses reflect the VCM level in ppm of contained resin. 4. Capco, Siloam Springs, Arkansas a. Resin (5385, Aberdeen) b. Dry blend 390 200 These were supplied by Capco via parcel delivery. The time interval between sampling and delivery/analysis is probably about a week. Pipe was to have been sent but has not been received. F. Kennedy April 11, 1974 Page 3 196 B. Resin and Derived Compound, Aberdeen 1 90828, Blk 10 . ppm, VCM a. 5350 resin used b. 3S 20421, B4 pellets (from l,a resin) c. 5350 resin used d. 3S 20421, A5 pellets (from l,b resin) 5,000 54 2,500 150 The compounds were made on line 3 on March 20. The resin was being dried to the silo in both cases, so there was little silo residence time before it was compounded. 2. 80128 White 0 3. 80857 Black 0 2 and 3 were received from Aberdeen in connection with another problem the week of March 18 and dissolved for analysis by March 25. They represent retains of mate rials made at Aberdeen within the last three months. The zero detectable levels are additional evidence that time leads to reduced levels of VCM in PVC in any form. C. Miscellaneous Resins and Finished Items The following, 1 through 4, are resins stored in bags in P//C. The dates are for manufacture in Aberdeen. 1. 5260 - 42492 (9/12/72) 2. 5300 - 42704. (6/20/72) 3. 5385 (- ) 4. 5446 - 56802 (7/24/73) Long-term storage of resin in bags may not be practi cal but is at least a boundary condition for certain removal of VCM. We are doing a "simulated silo" storage in the lab. 5. 5385, OkC. received in boxes, shipped to Ponca City 1/25/74 Assuming initial VCM levels about equal to those recently determined; i.e., 550-580, the fall off has been about one-half. 0 0 0 0 260 % F. Kennedy April 11, 1974 Page 4 ppm, VCM 6. 5385, OkC, originally at 750 ppm off dryer M500 on 2/28/74 (analyzed on March 3, 1974), was re-analyzed on March 26'after storage in a capped bottle 64 7. Medical tubing, extruded by Travenol, ca. 2-4 weeks preceeding analysis; presumed by Travenol to be from 5446 resin. Sample is ca. 3 mm ID, 3.4 non 0D. 0 8. Tygon tubing from storeroom shelves; age not known, ca. 1/4" ID, 1/2" 0D. 0 rh CC: EMS KY GFT PAS DVP HJH KLS GJK JSC JFG WRBe