I’m one up on the comic book geeks! I bet even a lot of them don’t know about Absorbing Man!
Yes, there really is such a character. He’s featured here and in Wikipedia, which says:
Carl “Crusher” Creel was a boxer and later jailed criminal who becomes the Absorbing Man when he drinks a liquid which the Asgardian god Loki laced with rare Asgardian ingredients. Discovering that he could absorb the properties of anything he touched, Creel escaped prison and went on to battle Thor.

Below, when Captain America whips his shield at him, Absorbing Man takes on the properties of the shield:

That’s just like how PIG® Absorbent Mat takes on the properties of anything that it absorbs. For instance, PIG® Mat saturated with a hazardous liquid should be treated as hazardous. That’s why you see this text on PIG® product cartons:
Please note: PIG® absorbent products must be disposed of
in compliance with local, state and federal regulations.
Because various fluids absorbed may be of toxic or hazardous nature,
New Pig Corporation does not recommend disposal procedures.

That’s always good to keep in mind. As is this tip from Wikipedia: If you encounter Absorbing Man, spray him with water. He’ll take on the properties of the water and flow apart!
In that way, he’s unlike PIG® Mat, which stays strong even when soaked because of its multi-layer construction:

Uh-oh! What would happen if you flung a bale of PIG® Mat Pads at Absorbing Man and then sprayed him with water? He’d be unstoppable!