Friendship's hardness scale?

[Michael Zhuang]

Can somebody explain the hardness scale that Friendship is using here?

The rubber is listed as 47. What would this be on the DHS scale or the ESN scale? Friendship also does the Battle 2 rubbers, which they list as 39 or 40 (same as DHS). Why would they use 2 separate scales for different lines of rubber?

 

[sampletext]

I think for euro/jap sponge rubbers they use esn scale. For Chinese rubbers they use the same as dhs. The bloom rubber from the link says it has a cake sponge which is why they are using esn scale.

 

[Michael Zhuang]

I think for euro/jap sponge rubbers they use esn scale. For Chinese rubbers they use the same as dhs. The bloom rubber from the link says it has a cake sponge which is why they are using esn scale.

But that doesn't seem to make sense to me. 47 ESN would be like Rakza 7 or G1 hardness. But Bloom seems to be quite hard, like a DHS rubber.

 

[igorponger]

“Experience is never at fault; and judgment without practice will end in error"​

/ Leonardo da Vinchi /​

A while ago I undertook a series of measuring on RITC, 729 and Yinhe rubbers as being uncertain which of hardness scale they do employ for numbering on their sponges/
729 blue sponge is numbered with 44 H, while my Shore-O device reads 54 H. By a simple deduction we can surely state that Friendship / RITC rubbers all are using Shore A scale (aka @butterfly scale) to display hardness values.

Be happy.

 

[yoass]

I am also inclined to believe it's a Shore A hardness, which is entirely common for CN manufacturers.

That is one hard rubber, though. In the Asker C scale that roughly translates to 67. (Yes, happy be.)