High-Strength NSF-61 Certified Plastics? 2

[balloon]

Hello!

I am designing a product that is inserted into potable water applications. I am looking for a high strength (~16 ksi yield strength, 1000 ksi elastic modulus) plastic that is NSF-61 certified.

I have tried Delrin 150 NC010 (10 ksi yield strength, 420 ksi elastic modulus), but it ended up being too weak and flexible. I found Zytel 77G33L NC010 (25 ksi yield strength, 1200 ksi elastic modulus) today, which looks like it might work well, but I am hoping to find a few other options.

Ideally, the plastic would be readily available in stock materials, and then able to be molded, extruded, or machined to final form. Water absorption is also a factor; the less, the better (Zytel is .30% after 24 hours).

Thank you for the help!

 

[ornerynorsk]

http://www.plasticsintl.com/food_compliant_materials_table.html

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[Pud]

The important criteria are water temp and length of immersion.

If you know this could help a bit more...

H


www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

 

[balloon]

Thanks for the replies!

I'm working my way through the list ornerynorsk sent to see if any of these materials match my required properties.

Pud, the water temperatures range from 15 to 250°F and it will be constantly submerged.

 

[Pud]

Is the 250F correct?

If so, you need to look at PPS, PAI or PPA.

Zytel HTN is a PPA.

H


www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

 

[Pud]

Zytel HTN NSF 61

www.tynevalleyplastics.co.uk

It's ok to soar like an eagle, but weasels don't get sucked into jet engines.

 

[balloon]

Those Zytel materials look like they'll do the trick! Thank you, Pud!

 

[btrueblood]

Or PEEK.

 

[Carlos Gomes]

Hello.

To achieve the desired mechanical properties, only a ABS, PC, nylon or POM reinforced with 30, 40 or really 50% of glass fiber. Case should be taken when you choose nylon because of water absorption. Only polimeric materials reinforced with glass fiber can be used, but the material became a fragile mechanical behaviour.
Antoher material that could be used is the thermoplastics materials called 'special polymers', as PAR, PEEK, PI, LCP, PSU and so on... But when you choose this materials the price rises!
To better adjust your requirements to the plastic material, you could use a generic database plastic selector for a better choose of the plastic material, like, omnexus.com, matweb.com, IDES.com, m-base.com and a specific database like CAMPUS.

Hope i could help.
Regards.

 

[balloon]

Thank you, Carlos!

I will check into those database websites: I've used matweb before, but have not seen the others.