The calculation to determine the extract potential of the malt is based on a comparison to sucrose as a reference standard. Sucrose yields 100% of its weight as soluble extract when dissolved in water, giving a SG of 1.046 (or 46 ppg).
According to your malt sheet, a coarse grind of that malt (Extract CG) yields 79.5%. So, 79.5% of 46, or 36.6.
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