EU fill power and US

[Bearbonesnorm]

I know that the two ways of measuring fill power give different results, with the US version resulting in a higher fill power number. Does anyone roughly know what the differences are, eg does US 900 equate to EU 800?

[Taylor]

Alpnick to the forum please.


IIRC it's something like 100in³/oz difference

i.e.900US = 800EU

I could be talking rubbish though.

[Bearbonesnorm]

i.e.900EU = 800US

It must be the other way round, a lower EU number will offer the same insulation as a higher US number ... I think

[Taylor]

Yeah I got it wrong, then edited it once I reread my post.

[pedalhead]

PHD's website also mentions something about this...

Remember that our figures are based on the standard Lorch test as approved by the International Down and Feather Bureau. These figures are roughly 4% more conservative than US Federal tests, as quoted by some other manufacturers.
http://www.phdesigns.co.uk/techdown6.php?

[Anthony]

That is more about the accuracy of the machine though, not the scale used to record it.

I usually estimate 10-12% less, its not as simple as -100. A bit like C into F by all accounts.

[pedalhead]

Some interesting stuff on the reason behind the difference. This also seems to agree with the PHD comment...

http://www.trailspace.com/forums/gear-s ... 90935.html

[Anthony]

What is misleading is when a manufacturer states-

'300g of 800 fill European 90/5 goose down'

Ok, so the down has be sourced from Europe but that still doesn't confirm which scale the down has been measured on :!: