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| Non hardening sealant to 400psi |
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| chipenter:
You have to stir it well the black always comes to the top , i would leave it overnight or until the smell goes away . |
| doubleboost:
Blue hylomar is now classed as cancer causing (this is why the new stuff is no good) I still use "stag wellseal" on face to face joints http://www.hutsonprecision.co.uk/wellseal-jounting-compound/ John |
| picclock:
Just had a failed 1/2" BSP threaded joint fail with Stag Red. Most disappointing. Pressure only 150psi. Stag red applied copiously to fitting and allowed to set overnight. Threads of mating parts are good though dissimilar metals, brass/aluminium. Temperature ambient. Clearly something is wrong here but without further application info I'm not sure what. Threads were cleaned and degreased prior to assembly. Around 7 threads engaged as far as I remember. Also found that when leak checking with paraffin, that the paraffin appears to dissolve the stag red, not impressive for a sealant supposedly resistant to petrol and oil (so it says on the tin). Hopefully the alternate PTFE sealant I purchased will arrive today and I can see how that fares. Best Regards picclock |
| John Rudd:
Is this thread a tapered bsp thread or parallel? I would not expect a tapered thread to leak with 7 threads engaged and sealed with a decent sealer... When I was an apprentice we had to do a test piece for pipe fitting, threads were cut using appropriate dies and then 1 and a half turns of PTFE tape applied and then hydraulic pressure tested to check the quality of the threading and assembly. Pass or Fail... :clap: |
| picclock:
@ John Its a parallel threaded fitting. On disassembly I found that the male thread was evenly coated to the end with the sealant. However only the top two female threads had sealant, although it looked like an even coating. I had only applied sealant to the male part as per instructions, and it would appear that because the threads were so good excess got scraped off after the first two threads. It may have been a different story if I had coated male and female threads. However the real killer is that the sealant clearly dissolves with paraffin. And I'm betting it would with any other oily bits, despite the tin saying that its resistant to petrol and oil. I suppose it depends on how you define resistance, but I would say the performance is poor against these petrochemicals. I am about to remake the joint with Swan Seal, a ptfe compound (it says on the tin). Best Regards picclock |
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