LDPE gaskets

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fjfj765
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LDPE gaskets

#1

Post by fjfj765 »

Greetings,

I have 2 blowlamps with inoperative lead gaskets. BernieDawg uses LDPE washers in place of lead on NRVs, and it seems they seal quite well for him. Can LDPE gaskets be used in place of lead?

Thank you!

-fjfj765
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hikerduane
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Re: LDPE gaskets

#2

Post by hikerduane »

Application? I have some I have used on NRVs.
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fjfj765
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Re: LDPE gaskets

#3

Post by fjfj765 »

I would like to replace lead gaskets on fill stopper and on the removable pump cylinder.
MYN927
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Re: LDPE gaskets

#4

Post by MYN927 »

I haven't tried LDPE but had used HDPE in place of lead gaskets on lanterns. They sealed pretty well and are more resilient than lead. Can be re-used(tightened and loosened) multiple times provided you don't overtighten and flatten them too much.
HDPE is also fairly resistant to most acids, alkalis, solvents and fuels.
Both HDPE and LDPE aren't too heat-resistant. They are thermoplastics. I wouldn't use it on any surface that is likely to be heated close to 100°C(212°F) or higher.
The melting temperatures for LDPE is between 220-240°F and for HDPE, 248-266°F.
So, @fjfj765, for your blowlamps, I believe the working surface temperature would be the primary deciding factor.
Cottage_hill_bill
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Re: LDPE gaskets

#5

Post by Cottage_hill_bill »

Before you decide your lead gaskets are faulty, realize you can't tighten them by hand sufficiently to seal. That's why early Coleman lamps had a wrench.
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Whitegas Extraordinaire
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Re: LDPE gaskets

#6

Post by Whitegas Extraordinaire »

LDPE is kind of hard Vs most common Nitrile or Fluorocarbon seals.
427 Nitrile cap gaskets work very well on a quicklite and most early GPA that came with a lead seal.
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hikerduane
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Re: LDPE gaskets

#7

Post by hikerduane »

I wouldn’t use them on mentioned apps, they need to be snugged down more than rubber.
Duane
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fjfj765
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Re: LDPE gaskets

#8

Post by fjfj765 »

CHB, the lead gaskets were very damaged, and even after tightening a lot with a wrench, it would not seal.

Duane, I can't find reasonably priced seals of the size required. O-rings don't work very well.
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hikerduane
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Re: LDPE gaskets

#9

Post by hikerduane »

fjfj765 wrote: Fri Mar 01, 2024 5:07 pm CHB, the lead gaskets were very damaged, and even after tightening a lot with a wrench, it would not seal.

Duane, I can't find reasonably priced seals of the size required. O-rings don't work very well.
Make your own? Try Thefettlebox?
Duane
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fjfj765
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Re: LDPE gaskets

#10

Post by fjfj765 »

Can't afford to buy viton, definitely can't afford the fettlebox. LDPE is free.
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outlawmws
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Re: LDPE gaskets

#11

Post by outlawmws »

Why not just re-flow the lead gasket? A little flux, a little heat on a level surface...
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fjfj765
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Re: LDPE gaskets

#12

Post by fjfj765 »

hmm... might try that. would rosin-like flux for electronics work?
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outlawmws
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Re: LDPE gaskets

#13

Post by outlawmws »

I'd get some plumber's flux or old school Nokorode - RECTORSEAL Soldering Flux: 1.7 oz, Jar, Nokorode https://www.grainger.com/product/442Y43 ... lsrc=aw.ds
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