Document 5k8zZ19yL6qJw8Z5MYvpqQJr5

UNION CARBIDE CORPORATION CHEMICALS AND PLASTICS ENGINEERING SOUTH CHARLESTON, WEST VIRGINIA **cp UNION BUSINESS CARBIDE CONFIDENTIAL MEMORANDUM March 23, 1982 ***S0,U*6 *4e TO: CC: FROM: SUBJECT: R. E. Jarrett, 514 E. B. Snellings, 514 R. N. Bates, 514 G. B. Elder, 511 B. N. Gliatta, 514 L. A. Peggs, 511 H. L. Wise, 514 ~"' A. E. Wood, 514 MOC H. T. Pritt CONCLUSION OF TEST FOI IN CONTACT WITH VINYL Z 4 VCJP iii The test for polyethylene and polybutylene piping materials in contact with vinyl chloride has been concluded after 119 days. The test results do not differ greatly from the interim evaluation of 19 days that was reported earlier.(l) The effect upon polyethylene by exposure to vinyl chloride at ambi nt temperatures (0-25C) continues to be minor and the effect upon poly butylene under the same condition is moderate. Polyethylene and polybutylene test specimens were cut from piping materials and exposed to vinyl chloride at ambient temperatures in the ihigh pressure laboratory in Building 77J JThis information is needed n cflPIJUfltion with the project to slip-line a 4" steel line with plastic piping to convey vinyl chlor ide^^oaiBiJls^Jior^i_^hajMeston^erminalto_(thg, process unit on Blaine lsland._/One set of specimens was stressed by clamping in a U-bend position to determine if the piping would crack in service. The results of the test in the attached table show a Rockwell M hardness increase in polyethylene from 15 to 17, an absorption rate of 8 Mgs/Cm^, and no other dimensional change. Polybutylene increased in hardness from 37 to 47 Rockwell M and had an absorption rate of 19 Mgs/Cm2, There was no significant change in the measured properties of either piping material from the 19 day interim evaluation to the end of the 119 day test period. No cracking was found in either the polyethylene or polybutylene stressed specimens. UCC 102415 2 There is a tendency for the piping materials to harden over the longer exposure period. The hardening effeetis only slight on tfr- k.. XfflJi le"p'roiiuunced on the pol y butyl enj_J However, the test results indicate /thfft pfilyethylene should perform satisfactorily for an indefinite period Lin vinyl chloride service at ambient temperatures;/ Polybutylene wouia give limited service under the same"concITf.ions. If there are further questions, please contact me. HTP:es Attachment: 1-Report INDEX: Attach to File No.: 16116 H. T. Pritt UCC 102416 TO: R. E. Jarrett, 514 . B. Snel lings, 51** UCC CENTRAL ENGINEERING MATERIALS TECHNOLOGY PRODUCT EVALUATION DATE: March 23, 1982 EVALUATION REQUESTED BY: R. E. Jarrett/E. B. Snellings______________________ PRODUCT & MFGR.: Polyethylene and Polybutylene pipe_____________________________________ APPLICATION: Piping for vinyl chloride service TEST CONDITIONS: Stressed and unstresses specimens of polyethylene and polybutylene pipe were exposed to vinyl chloride at ambient temperature for 119 days with an interim evaluation at 19 days._____________ _____________ ____________________ ____ TEST RESULTS: _________________________ POLYETHYLENE____________________________ POLYBUTYLENE _________________________________________ 19 Days 119 Days ________________ 19 Days 119 Days Thickness Change, IN.-------------------------------- ---------------0__________________________ ___ ___________0 Weight Change, Mgs/Cm^_________________+8___________+8_____ __________________ +24__________ +19 tfdness 15^) 15 17 37(1) 47 45 (1) Rockwell M Scale hardness at start__________ _______ ________________________ CONCLUSIONS AND RECOMMENDATIONS: There was no significant change in the above properties of polyethylene in contact with vinyl chloride after evaluation at 19 days and at the conclusion of the 119 day test. polybutylene was moderately hardened under the same test conditions. Neither of the stressed specimens showed any evidence of cracking. Polyethylene is rated "Recommended1' and polybutyiene is rated "Fair"._________________________________________________________________ IF THERE ARE ANY QUESTIONS REGARDING THIS PRODUCT EVALUATION, PLEASE CONTACT H. T. Pritt BLDG. 740 , ROOM 2403 , EXT. 555** NOTEBOOK REFERENCE: 4-HTP-105 FILE NO.: Attach to File No.: 16116 ___ HTP;es Corrosion and Materials Technology Lab South Charleston Technical Center UCC 102417