Assertion: hypophosphorous acid's concentration | /r/HasProperty | about 30 to 50%
Facets:
value: by mass
type: OTHER
Source sentences:
text: The amount of monomer used in the polymerization step is not particularly limited, but is usually used so that the concentration of the acrylic acid polymer contained in the target aqueous acrylic acid polymer solution is about 30 to 50% by mass.