70D vs 90D: is the Difference Negligible?

[Toestr]

So my usual oring dealer only carries the size I need for a STBB hammer in 70D while the factory specs are 90D. Can I get away with it for a reasonable amount of time or na?

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[flyweightnate]

It'll last for a while.

Stick to urethane if you can - a lot more forgiving if it starts to run dry. But if all you have is NBR 70, keep it oiled and you'll probably be ok.

Oh - theoringstore.com is where I get my specific stuff, like urethane and odd sizes.

[PlawB]

It's not going to matter for the hammer. That's a high wear part anyways and will need replacement just as often.

[Toestr]

Alright thanks. I usually purchase from theoringstore. It's an 11x1.5mm oring I need and they only carry it in 70D in any material.

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[Trbo323]

Depends on the exact use. I've had markers that are speced with polyurethane 90d be just fine running buna 70d.

I've also had a case where a polyurethane 70d was speced and a poly 90d or a buna 70d was not good enough

Depends on the marker

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[Chuck E Ducky]

For instance CCM valves if you don’t use the right hardness they won’t seal. Standard Bunna that come in most kits do not work. I chased a valve leak for weeks and bought new valves before I emailed CCM and they told me what I was doing wrong. So some markers it matters others it dose not.