M. Gilchriese

Glued Fittings

October 26, 2005

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Samples and Prep

• Three samples using Hysol 9396• Seven samples using Hysol 9394• Surface prep tubes

– Sandpaper(600) with alcohol– Wash with alcohol– Wash with acetone

• Surface prep fitting– Brass wire brush with alcohol– Wash with alcohol– Wash with acetone

• Irradiate to about 25 MRad• He leak -> P to 15.5 bar -> He leak -> irradiate -> P to 15.5 bar

-> He leak. Vacuum inside part.

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

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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. Fine after about 100 thermal cycles.

• Next step is high pressure He test. Making setup.

SampleWeight Before

Weight After(10/4) After-Before

Resistance After

Leak Before Leak After

After Thermal Cycle

96A 1.9813 1.9838 0.0025 Open 1.10E-09 1.30E-09 Sectioned96B 1.9788 1.982 0.0032 Open 1.10E-09 1.30E-09 1.20E-0996C 1.97 1.9735 0.0035 0 1.20E-09 1.30E-09 1.20E-0994A 1.8542 1.8579 0.0037 Open 1.10E-09 1.40E-09 Sectioned94B 2.0056 2.0073 0.0017 Open 1.10E-09 1.20E-09 1.40E-0994C 1.8837 1.8855 0.0018 0 1.10E-09 1.30E-09 1.30E-0994D 1.7724 1.7748 0.0024 Open 1.20E-09 1.60E-09 1.30E-0994E 1.7756 1.7778 0.0022 0 1.10E-09 1.50E-09 1.10E-0994F 1.7809 1.7833 0.0024 0 1.00E-09 1.10E-09 1.20E-0994G 1.9228 1.9256 0.0028 Open 1.30E-09 1.50E-09 1.20E-09

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9396 Pictures

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9394 Pictures

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Cross Section 9396

9396

Tube in aboutCorrect Longitudinalposition

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Cross Section 9394

9394

Tube notFullyInserted

Big void

Glue film

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First Conclusion

• Promising but need more testing.• Simple mechanical test completed(9394B) by constraining tube

and applying torque to fitting. Tube deformed first, glue joint did not break. Stopped and leak checked OK.

• In process of setting up shear tests that will compare irradiated to non-irradiated. And 9394 to 9396.

• Need more tests in C3F8 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.

• Need to understand importance of guaranteed electrical contact. Believe can make contact (by tube contact with fitting at end), which could be checked during assembly. Long term?

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Capillaries

• Six samples made with Hysol 9394

• All pass He leak -> P to 20 bar -> He leak, Vacuum in part.

• Setting up to irradiate 4 in C3F8. Will keep other two at 20 bar in the meantime.

SampleWeight Before

Weight After Rad

Weight After-Before

Leak Before* Leak After

After Thermal Cycle

A 1.8613 <1e-9B 1.8619 <1e-9C 1.8612 <1e-9D 1.8472 <1e-9E 1.8539 <1e-9F 1.8638 <1e-9

* after pressurization to 300 lb gauge

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Capillary Samples