Polyimide joint under tension in 50% HF

1
Polyimide joint under tension in 50 HF

• Goal to observe effect of HF solution on PI-E
  joint under tension
• Things to look for
• Destruction of polyimide tubing
• Stretching/deforming of joint
• Wire damaged or breaks or pulls out

2

• HF tension setup
• 100 grams tension
• (not shown polyethylene cover on HF)

camera
tension plate
Wirejoint in pool of 50 HF
Clip, pulley, weights
Polyethylene block
3
76 hours
104 hours
120 hours
126 hours
144 hours
4

• Closeup of joint

5

• Conclusions
• HF attacks glue from ends, also forms bubbles
• Wire slips out through softened glue, knot gets
  tighter
• Possibly some stretching/shrinking