comp. tens. Izod water Ball coeff. wear str. str. impact hardness abs. density indent friction factor ----- ----- -------- --------- ------ ------- ------ -------- ------UHMW-PE 2000 3100 no break D62-D66 0 0.034 5700 0.14 0.1 PTFE ? 3900 3.5 D50 0 0.078 - 0.09 4080 ABS 5000 6500 7.0 R105 0 0.038 13500 ? ?polycarb. 12000 9500 13.0 M70, R118 0.12 0.043 16500 ? ?nylon 6/6 12500 11500 0.6 M85, R115 7 0.042 20000 0.25 162 w/30% GF 20000 27000 2.1 M101 0.7 0.049 30000 0.31 150acetal 15000 9500 1.0 M88, R120 0.2 0.051 19500 0.21 340PET-P 15000 12400 0.5 M93, R125 0.07 0.051 19500 0.20 121PAI 19000 13000 1.0 M113, E75 0.35 0.053 ? 0.35 637PEEK 20000 16000 1.0 M100,R126 0.1 0.047 27500 0.27 467 <--- w/30% GF 26000 15000 1.4 M103 0.1 0.056 37500 0.25 187PEI 22000 16500 0.5 M112 0.25 0.046 21800 0.39 605 <---
The poppets on both my challenger big bores looks like that same stuff , I wonder if there's a way to tell if it's the same.
Don't get excited. We're not talking about PIE...Talking about PEI. Polyetherimide. On paper, it has properties similar to PEEK: Code: [Select] comp. tens. Izod water Ball coeff. wear str. str. impact hardness abs. density indent friction factor ----- ----- -------- --------- ------ ------- ------ -------- ------UHMW-PE 2000 3100 no break D62-D66 0 0.034 5700 0.14 0.1 PTFE ? 3900 3.5 D50 0 0.078 - 0.09 4080 ABS 5000 6500 7.0 R105 0 0.038 13500 ? ?polycarb. 12000 9500 13.0 M70, R118 0.12 0.043 16500 ? ?nylon 6/6 12500 11500 0.6 M85, R115 7 0.042 20000 0.25 162 w/30% GF 20000 27000 2.1 M101 0.7 0.049 30000 0.31 150acetal 15000 9500 1.0 M88, R120 0.2 0.051 19500 0.21 340PET-P 15000 12400 0.5 M93, R125 0.07 0.051 19500 0.20 121PAI 19000 13000 1.0 M113, E75 0.35 0.053 ? 0.35 637PEEK 20000 16000 1.0 M100,R126 0.1 0.047 27500 0.27 467 <--- w/30% GF 26000 15000 1.4 M103 0.1 0.056 37500 0.25 187PEI 22000 16500 0.5 M112 0.25 0.046 21800 0.39 605 <---However it is less than a third of the price ($4 versus $13 for a 3/8" x 1ft rod*). So I decided to try a piece. A piece of PEI...ba da bing! Turns out it machines very nicely. This is the finish straight off the lathe using a HSS cutter made by a novice.Based on feel and the way it cuts, it seems just a bit harder than PEEK and produces a higher pitched *tink* when struck...which all seems consistent with the specs. Of course what matters is how it performs. I have a project coming up that will give me an opportunity to try it so I'll report back once I've spent some time with it.* example prices from Grainger:PEI: https://www.grainger.com/product/1NRN1PEEK: https://www.grainger.com/product/1UPT8