DennisStrickland
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ginsu hunting knife with catra rating of i.c.p. & c .e.r.anybody know what this translates to?tks.
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catra desigination
- Thread starter DennisStrickland
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- Jul 30, 2006
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I am guessing you are asking about this:
http://www.ginsuoutdoors.com/FixedDropPoint.html
The way the CATRA edge retention test works is they cut special cardboard, using a weight (350 grams, ~3/4 pound) to drive the cut. They measure how many inches of cardboard the knife can cut before the blade becomes so dull that 350 grams is insufficient force to make it cut.
So normally you are talking about a unit of "inches of cardboard processed" or "i. c. p.".
I do not know what the "c.e.r." means.
I do not know if 90 and 400 are good numbers compared to those of other blades. CATRA does not publish results. It is up to the company performing the testing to post results if they wish. Most don't wish. So there is nothing to which to compare these to.
In their "edge 2000" development work, Buck Knives showed that the CATRA test results are much more dependent on edge angle and blade shape than on hardness and alloy properties. Using two different blade shapes (an optimized shape for the 420HC and another shape for the BG42) they were able to get 420HC to outperform BG42. Of course when they used the same profile for both alloys the BG42 way outperformed the 420HC. I would argue that the importance of blade geometry is also true in actual use, but it does show that just posting CATRA numbers themselves can be misleading.
Edited to add:
My bad. I found a link on the CATRA web site that tells what the initials mean:
http://www.catra.org/pages/products/kniveslevel1/comparisons.htm
"i. c. p." is a measure of initial sharpness
"c.e.r." is edge retention, measured in how much cardboard is cut.
http://www.ginsuoutdoors.com/FixedDropPoint.html
The way the CATRA edge retention test works is they cut special cardboard, using a weight (350 grams, ~3/4 pound) to drive the cut. They measure how many inches of cardboard the knife can cut before the blade becomes so dull that 350 grams is insufficient force to make it cut.
So normally you are talking about a unit of "inches of cardboard processed" or "i. c. p.".
I do not know what the "c.e.r." means.
I do not know if 90 and 400 are good numbers compared to those of other blades. CATRA does not publish results. It is up to the company performing the testing to post results if they wish. Most don't wish. So there is nothing to which to compare these to.
In their "edge 2000" development work, Buck Knives showed that the CATRA test results are much more dependent on edge angle and blade shape than on hardness and alloy properties. Using two different blade shapes (an optimized shape for the 420HC and another shape for the BG42) they were able to get 420HC to outperform BG42. Of course when they used the same profile for both alloys the BG42 way outperformed the 420HC. I would argue that the importance of blade geometry is also true in actual use, but it does show that just posting CATRA numbers themselves can be misleading.
Edited to add:
My bad. I found a link on the CATRA web site that tells what the initials mean:
http://www.catra.org/pages/products/kniveslevel1/comparisons.htm
"i. c. p." is a measure of initial sharpness
"c.e.r." is edge retention, measured in how much cardboard is cut.
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