Patent ID: 8420403

Claim:
A method for evaluating the caking property of sodium hydrogencarbonate crystal particles, comprising: hermetically sealing the sodium hydrogencarbonate crystal particles in a packaging material having a water vapor transmission rate of at least 3 g/(m 2 ·24 h) at 40° C. with a relative humidity difference of 90% as stipulated in JIS K7129, resting the hermetically sealed sodium hydrogencarbonate crystal particles at a temperature of from 17 to 35° C. at a carbon dioxide gas concentration of from 0.03 to 0.05 vol % at a relative humidity of from 40 to 95% for from 2 weeks to 3 months, and measuring a content of Wegscheider's salt or a content of sodium sesquicarbonate in the rested sodium hydrogencarbonate crystal particles, thereby evaluating the caking property of the sodium hydrogencarbonate particles.