Lately we have received complaints that our creamer products are difficult to dissolve in hot water. The raw material we use is vegetable oil and fiber, some phosphate powder as emulsifier and there is the addition of silica dioxide by mixing it in the final powder.
We have conducted check from big batch but we can not find clumping in those batch (paper bag) and we find powder clumping in hot water only when we did repack from big batch to small batch (aluminium foil bag) only. We did repack on room condition : temperature 24 degree C, RH 57% (same condition with big batch).
Has anyone have experience or knowledge about this matter?
What kind of checking should we do for this matter?