Crisp malting Best Ale malt analysis
TYPICAL ANALYSIS
PARAMETER | IoB | EBC | ASBC |
---|
MOISTURE | 3.5% max | 3.5% max | 3.5% max |
EXTRACT | 306 L°/kg | 80.8% | 80.8% |
COLOUR | 5.0-6.5 EBC | 5.5-7.2 EBC | 2.5-3.1 °L |
TN/TP | 1.30 - 1.65% | 8.0 - 10.0% | 8.0 - 10.0% |
SNR/KI/ST RATIO | 38-48 | 43-54 | 43-54 |
The analysis in #76 is better, although what's presented as ASBC "extract" could be Coarse Grind Dry Basis, Fine Grind Dry Basis, or even an "As Is" (i.e. not excluding moisture) Basis. I would hope that it's Fine Grind Dry, i.e. the most useful one, but it doesn't say
Just looking at the value (80.8%) it looks to me like a FGDB number.
I have emailed Crisp, asking about how the conversion formula was derived and whether the EBC side is coarse or fine grind, as is or dry, etc.
I will admit that I had never heard of IoB (Institute of Brewing, now IBD - Institute of Brewing and Distilling) standards until this thread. An odd-ball collection of standards, used primarily in a limited geographic region, gifted to the world by the same folks that cursed the USA with the Imperial units of measure (however, they don't use imperial units in the IoB standards.)
After a little poking around, I learned that their extract values are the metric analog of PPG. If the definition was written the same way as the PPG definition it would be: "Extract Value" is equal to 1000 * (SG - 1) if you mashed 1 kg of grain with enough water to make 1 L of
wort. However, that is a practical impossibility, and you would also be up in the SG region where linearity of SG vs. sugar concentration is no longer a close approximation. so they define it in an even more awkward, but equivalent way. The IoB definition of the "Extract Value" is: The number of liters of 1.001 SG wort that could be obtained by mashing 1 kg of grain with the required amount of water. Took me a while to wrap my head around that.
You use the IoB "L°/kg" just like you use PPG but with volumes in liters, and grain mass in kg.
The conversion of PPG to L°/kg is:
L°/kg = PPG * 3.78541 L/gal * 2.20462 lb/kg
So the 80.8% extract from the quoted specs works out to:
PPG = 80.8% * 46.17 PPG / 100% = 37.3 PPG
L°/kg = 80.8% * 46.17 PPG * 3.78541 L/gal * 2.20462 lb/kg / 100% = 311.35
If I convert the 311.35 to "as-is" basis @ 3.5% moisture the value becomes 300.45. Given that the spec sheet quoted gives a value of 306, it seems likely that this is a Coarse Grind (0.7mm vs. 0.2mm) Dry Basis value.
The equation:
IOB = (EBC-1.705)/0.2586 appears to come from the last equation above. If you ignore the % units and just do the arithmetic that last equation becomes:
L°/kg = EBC * 3.8533 = EBC / 0.2595
I'm guessing that the -1.705 is an adjustment factor for coarse grind vs. fine grind. The 0.2586 vs. 0.2595 is probably an artifact of the way they curve fit a bunch of IoB data to EBC data.
Brew on