Big Red here with the second installment of tests to determine liner acceptability.
So, TAKE FIVE!
Welcome back!
PFC Murphy is sufficiently recovered from our initial presentation and is ready to help demonstrate the next three of seven tests devised to determine if a liner was or was not acceptable.
We have established that the moisture absorption test was used to verify that the liner body had complete cure and that the ball test was used to verify that the liner body wouldn’t crack or splinter under impact. This installment will review three more of the seven main liner tests: Delousing Treatment, Flammability and Flexibility.
So, let’s get into it…
The purpose of delousing was to rid liners of lice before reissue, and the test basically replicated this process by exposing liners to high-pressure, hot steam for thirty minutes to see if they held up or fell apart. Any liner that was undercured would have low resistance to steam and heat, which would resume the curing process. Because the liner was no longer contained within a mold cavity, the stress in it would cause it to twist and distort out of shape.
Did You Know:_________________________________________________________________________
The primary complaint about the fixed leather liner chin strap was that the delousing treatment effectively cooked the strap clean off the liner, and replacement wasn’t possible.
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Uhhh, well, I suppose PFC Murphy’s demonstration pretty much covers this one, so on to flexibility.
Tests done to measure flexibility were looking for similar outcomes to the ball drop test minus the deflection measurement. If phenolic resin was overcured, it became brittle, and the flexibility tests would cause liners to crack or splinter, while those that were undercured and only tentatively cemented together would delaminate under the same test.
Did You Know:__________________________________________________________________________
Flexibility is the one test that Joshua performs on liner bodies before he puts them in his inventory.
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Well, I hope you’ve enjoyed our demonstrations. I know our participants have.
If your friends want to know how you gained your intel, tell em
Big Red Says!
FIVE'S OVER - MOVE OUT!
BRB-023
I wish they would have steam cleaned my k-pot before they issued it to me at jump school. That stank could raise the dead. Took 2 cans of lysol to kill it off.
I love that, slowly but surely, details of making our beloved M1 helmet are being revealed. Looking at my stock of liners now gives me a better insight
Didn’t realize how rigorous and important that each test step is. First time I heard of these. I have a greater respect for test validated liners now.
Wow I had know idea of the testing that done on the liners.
I very much enjoy the information.
DO WELL!
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