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Participant

Join Date: May 2009
Posts: 3

Gasket / O-Ring Material for Caustic Soda 50%

11/05/2009 12:32 AM

We have caustic soda dosing system having CPC and GRP piping. The neoprene rubber gaskets and the Orings on the piping joints keep failing. Can anyone suggest better material compatible for Caustic soda 50% solution?

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Associate

Join Date: May 2008
Location: Seoul, Korea
Posts: 35
Good Answers: 1
#1

Re: Gasket / Oring material compatible for Caustic Soda 50%

11/05/2009 12:43 AM

Provided that O-rings and gaskets are all rubbers, and they are all sheet gaskets, I would like to suggest FKM, FFKM, EPDM, Teflon.

Based on your budget, contact your usual gasket supplier and ask their price.

The materials that I mentioned will withstand caustic soda service very well.

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Guru
Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Location: Western Australia
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#2

Re: Gasket / Oring material compatible for Caustic Soda 50%

11/05/2009 4:26 AM

For NaOH - Sodium Hydroxide, the best choice is EPDM (Ethylene Propylene Diene Monomer - assuming temperature is OK.

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Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
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#4
In reply to #2

Re: Gasket / Oring material compatible for Caustic Soda 50%

11/05/2009 9:33 AM

That's right, and EPDM is cheap.

But if I remember right, at one time GRP wasn't considered suitable for NaOH, as it slowly attacks the glass fibres. Perhaps it's special glass? By the same token, glass-reinforcing of concrete was a no-no some years back, as cement is quite alkaline, but I believe suitable glass is available now. Anybody comment?

Cheers.........Codey

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Anonymous Poster
#3

Re: Gasket / Oring material compatible for Caustic Soda 50%

11/05/2009 5:38 AM

Viton or EPDM will be a better choice

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Power-User

Join Date: Apr 2007
Location: Kingman, AZ
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#5

Re: Gasket / O-Ring Material for Caustic Soda 50%

11/06/2009 9:42 AM
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Anonymous Poster
#6

Re: Gasket / O-Ring Material for Caustic Soda 50%

11/09/2009 2:28 AM

Vitone or silicon is suitable to any corrosive & High temp

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Associate

Join Date: Nov 2009
Location: india punjab
Posts: 28
#7

Re: Gasket / O-Ring Material for Caustic Soda 50%

11/17/2009 1:20 AM

u should go for metallic braded steam packing joint or teflon ( ptfe).

steam joint would be enough for u

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#8

Re: Gasket / O-Ring Material for Caustic Soda 50%

06/16/2023 5:48 AM

Yes. Any corrosion chart can do this.

Here is an example.

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