Question # 541

541. Is paraformaldehyde, CAS number 30525-89-4, reportable as formaldehyde under Section 313?
No. Paraformaldehyde is hydrated polymerized formaldehyde, a solid material that is different from formaldehyde. At ambient temperature, vaporization occurs, emitting formaldehyde gas. Though paraformaldehyde itself is not reportable, any formaldehyde manufactured as a gas or a solution during the manufacture, processing, or otherwise use of paraformaldehyde must be applied to any threshold determination for formaldehyde.