One pair of gloves at a border post may handle a sealed evidence bag, a leaking container of unknown solvent and a tray of powder from opened mail within the same shift. Certification is therefore a statement about specific chemical contacts, not a general badge of safety.
Certification Follows the Contact, Not the Product Name
Two committees write most of the rules that matter here: CEN/TC 162 in Europe and ISO/TC 94/SC 13 internationally. Their output includes EN ISO 374-1, which sets the Type A, B and C performance classes for chemical protective gloves, EN ISO 374-2 for penetration, EN 374-4 for degradation and EN ISO 374-5 for micro-organisms. Permeation itself is measured under EN 16523-1 in Europe or ASTM F739 in the United States. For chemical protection a glove is Category III PPE under Regulation (EU) 2016/425, so a notified body must issue a type-examination certificate and carry out ongoing surveillance of production. Testing has to come from a laboratory accredited to ISO/IEC 17025.
There is no legal class called a CBRN glove: the claim is only as strong as the standard cited and the certificate scope behind it.
Penetration, Permeation and Breakthrough in Screening Work
Penetration is physical leakage through pinholes, seams or stitching, decided by air or water leak tests. At a checkpoint it matters most for powders: material recovered from mail, tamper-evident bags, particulate from damaged parcels. A glove with an intact film but a porous stitched seam fails here.
Permeation is molecular. The chemical dissolves into the glove material, migrates across it and appears on the inside, and it is quantified as a breakthrough time for each challenge chemical. This is the relevant mode for seized liquids, fuel residues and vapour escaping from a container opened for inspection. Leak testing alone proves nothing about solvents: an intact film can still let a seized liquid cross at molecular level within minutes.
Degradation, covered by EN 374-4, records how the material changes after contact and whether the glove still grips a bag ten minutes in.
What the Test Report Has to Disclose
A report giving only a class letter is not enough for specification. Ask for the challenge chemical and its concentration: results apply to that substance, not a chemical family. Ask for test temperature: data generated at 23°C will not describe a glove worn against a warm surface in summer. Ask whether the specimen was a flat coupon or a complete glove including cuff and seams. Ask for the thickness tested; the data does not transfer to a heavier or lighter build. Finally, check that the endpoint is stated - normally a normalized permeation rate with a breakthrough time - and whether samples were new or artificially aged.
Gaps in Imported Stock, and How to Verify
Four gaps recur in tenders. The certificate names a different article number from the one being shipped. It was issued against a withdrawn edition of a standard. The CBRN wording is self-declared, with no notified body number behind it. Or the declaration of conformity and production date coding are absent, leaving no way to judge remaining shelf life.
Verification takes minutes. Search the four-digit notified body number in the European Commission NANDO database and confirm the scope covers chemical protective gloves. Match the article number on the certificate to the packing list. Request the full report with laboratory name and accreditation number rather than a summary page. Retain a sample from each lot and inspect seams, cuff geometry and marking on arrival.
None of this needs a chemist. It needs a buyer who knows which question each document answers.