Theres no need for you to validate yourself here.. or try to make someone look bad or lesser… so you work with Semitron and mitsubishi tovar .. big deal
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Let's talk Delrin.
- Thread starter Hw9720
- Start date
Theres no need for you to validate yourself here.. or try to make someone look bad or lesser… so you work with Semitron and mitsubishi tovar .. big deal
So don't be mean.
I did mention my OCD, it really does get me sometimes and I don't mean to demean or try to validate myself, Im perfectly confident in my abilities.
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Exactly the NAME of DELRIN is a proprietary blend of the Dupont company of the base material more commonly known as ACETAL.
While Delrin has a few properties that a base Acetal may lack ? ... Acetal based products can be teflon infused ( AF), Glass reinforced, among other blended attributes making the particular blend more use specific.
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An interesting read...
The main distinctions between Delrin and other acetal plastics stem from its composition as a homopolymer—it has a uniform crystalline structure rather than one incorporating multiple subunits. This leads to better properties in select areas—such as higher stiffness, flex fatigue resistance, and creep resistance—when compared to copolymers. Overall, Delrin offers slight but measurable benefits in terms of mechanical strength.
One negative characteristic specific to Delrin over other acetal plastics is its increased centerline porosity—an inconsistency in the center of the plastic caused by gas escape in the cooling process. While not a concern when the center of a rod is to be drilled out, this property can be problematic in certain food and medical related applications as centerline porosity increases the risk of bacterial growth.
Here’s the main takeaway: While Delrin does have some distinguishing properties, acetal plastics share enough in common that they are often interchangeable based on budget and other project-specific characteristics.
Source: https://www.emcoplastics.com/acetal-vs-delrin/
The main distinctions between Delrin and other acetal plastics stem from its composition as a homopolymer—it has a uniform crystalline structure rather than one incorporating multiple subunits. This leads to better properties in select areas—such as higher stiffness, flex fatigue resistance, and creep resistance—when compared to copolymers. Overall, Delrin offers slight but measurable benefits in terms of mechanical strength.
One negative characteristic specific to Delrin over other acetal plastics is its increased centerline porosity—an inconsistency in the center of the plastic caused by gas escape in the cooling process. While not a concern when the center of a rod is to be drilled out, this property can be problematic in certain food and medical related applications as centerline porosity increases the risk of bacterial growth.
Here’s the main takeaway: While Delrin does have some distinguishing properties, acetal plastics share enough in common that they are often interchangeable based on budget and other project-specific characteristics.
Source: https://www.emcoplastics.com/acetal-vs-delrin/
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PEEK is a bit too hard to seal very well. Nylon/Polyamide/PA6 works as well as Acetal, it's very slightly more difficult to machine and it has a much higher melting point.
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All materials are expensive right now. Delrin machines better than many of the alternatives mentioned. That alone makes it worth the small additional cost, at least in my book. Perhaps not if you're using hundreds of pounds, but a 3' stick should go a looooonnnnngggg ways for airgun use. I think I got my last acetal rods at OnlineMetals.com. They have / had a nice assortment pack in 3' lengths from 1/8"-1" that was reasonable (relative to prevailing cost).
GsT
GsT
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I couldn't find your thread (even looking at 'postings' in your profile). Where to start? Do you own a lathe? Can you competently perform basic turning, facing, and boring operations? Or are you starting from scratch? Machining a material like Delrin is very easy. Cutting tools might be your biggest challenge. If you'll link to the thread you started, we can continue there so as not to derail this thread any further.
GsT
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@GeneT I did the same thing. I think I asked in a PM. I need to start that thread. Give me a few and I’ll start it. Thank you.
Edit: here’s the thread I started on the topic.
Machining Plastics - How to Make a Poppet, Regulator Piston Seat, etc
I recently read a thread where @Vetmx made a peek valve seat or maybe it was a regulator piston seat. Anyhow, I’m interested in learning how to do this. Can those of you who have done it, explain the process or point me towards a good resource to learn how to make these parts? Please share...
www.airgunnation.com Last edited:
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Almost Never use Delrin / Acetal for poppet heads ... doing them in PEEK instead. ( Made 100's at this point )
Yup attention to surface finish on not only Poppets sealing surface but also the hard seat it will seal against is key !!
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