Glued Fittings October 5 2005 M Gilchriese Samples

Glued Fittings October 5, 2005 M. Gilchriese

Samples and Prep • Three samples using Hysol 9396 • Seven samples using Hysol 9394 • Surface prep tubes – Sandpaper(600) with alcohol – Wash with acetone • Surface prep fitting – Brass wire brush with alcohol – Wash with acetone • Irradiate to about 25 MRad (exact value TBD) • He leak -> P to 15. 5 bar -> He leak -> irradiate -> P to 15. 5 bar -> He leak 2 M. Gilchriese

Samples After Irradiation • Note that epoxy turns blue-like color. No evidence of epoxy running. 3 M. Gilchriese

Before/After Comparison • Small weight gain • Note that did not try to control electrical contact between fittings and pipe. Resistance after. Did not measure before. • Change in leak rate not significant. Small change from setup on different days. 4 M. Gilchriese

9396 Pictures 5 M. Gilchriese

9394 Pictures 6 M. Gilchriese

Cross Section 9396 Tube in about Correct Longitudinal position 7 M. Gilchriese

Cross Section 9394 Tube not Fully Inserted 9394 Big void Glue film 8 M. Gilchriese

First Conclusion • • • Promising but need more testing Thermal cycling about to start Will do pressure cycling also Mechanical strength tests to follow, need to define protocol Need more tests in C 3 F 8 not irradiated and irradiated to understand penetration into epoxy. Bulk epoxy samples • Assuming all is OK, better control of glue application and assembly. These samples were done in a hurry. 9 M. Gilchriese