UN 3373 (variant 1 of 2) — ADR 2025 Table A: class 6.2, classification code I4, packing group —, labels 6.2, special provisions 319, limited quantity 0, excepted quantity E0, packing instructions P650, transport category -, tunnel restriction code (-), hazard identification number 606.

UN 3373 (variant 2 of 2) — ADR 2025 Table A: class 6.2, classification code I4, packing group —, labels 6.2, special provisions 319, limited quantity 0, excepted quantity E0, packing instructions P650, transport category -, tunnel restriction code (-), hazard identification number 606.

UNECE ADR 2025, ECE/TRANS/352 · checked 2026-10-28

Table A — ADR 2025 (ECE/TRANS/352), UN 3373 — variant 1 of 2
(1) UN No.	3373
(2) Name and description	BIOLOGICAL SUBSTANCE, CATEGORY B
(3a) Class	6.2
(3b) Classification code	I4
(4) Packing group	—
(5) Labels	6.2
(6) Special provisions	319
(7a) Limited quantities	0
(7b) Excepted quantities	E0
(8) Packaging: packing instructions	P650
(9a) Packaging: special packing provisions	—
(9b) Packaging: mixed packing provisions	—
(10) Portable tanks and bulk containers: instructions	T1
(11) Portable tanks and bulk containers: special provisions	TP1
(12) ADR tank: tank code	L4BH
(13) ADR tank: special provisions	TU15 TU37 TE19
(14) Vehicle for tank carriage	AT
(15) Transport category (Tunnel restriction code)	- (-)
(16) Special provisions for carriage: packages	—
(17) Special provisions for carriage: bulk	—
(18) Special provisions for carriage: loading, unloading and handling	—
(19) Special provisions for carriage: operation	S3
(20) Hazard identification No.	606

Table A — ADR 2025 (ECE/TRANS/352), UN 3373 — variant 2 of 2
(1) UN No.	3373
(2) Name and description	BIOLOGICAL SUBSTANCE, CATEGORY B (animal material only)
(3a) Class	6.2
(3b) Classification code	I4
(4) Packing group	—
(5) Labels	6.2
(6) Special provisions	319
(7a) Limited quantities	0
(7b) Excepted quantities	E0
(8) Packaging: packing instructions	P650
(9a) Packaging: special packing provisions	—
(9b) Packaging: mixed packing provisions	—
(10) Portable tanks and bulk containers: instructions	T1 BK1 BK2
(11) Portable tanks and bulk containers: special provisions	TP1
(12) ADR tank: tank code	L4BH
(13) ADR tank: special provisions	TU15 TU37 TE19
(14) Vehicle for tank carriage	AT
(15) Transport category (Tunnel restriction code)	- (-)
(16) Special provisions for carriage: packages	—
(17) Special provisions for carriage: bulk	—
(18) Special provisions for carriage: loading, unloading and handling	—
(19) Special provisions for carriage: operation	S3
(20) Hazard identification No.	606

ADR 2027 (accepted) — what changes for UN 3373

ADR 2027 was accepted: depositary notification C.N.395.2026 (9 October 2026) records no objection to the amendments proposed by C.N.252.2026. It applies from 1 January 2027, and ADR 2025 may still be applied until 30 June 2027 (1.6.1.1). (C.N.395.2026)

UN 3373: Table A changes, ADR 2025 → ADR 2027
Entry	Column	ADR 2025 → ADR 2027	Source
entry 2: BIOLOGICAL SUBSTANCE, CATEGORY B (animal mate…	(17) Carriage special provisions: bulk	— → VC3	ECE/TRANS/WP.15/274, PDF p. 16

ADR 2025 remains the edition FreightUtils serves and the one that applies until ADR 2027 takes effect on 1 January 2027; after that, ADR 2025 may still be applied until 30 June 2027 (1.6.1.1).

All ADR 2027 Table A changes →Check a list of UN numbers →

In plain words — variant 1 of 2

Labels: Labels: model 6.2 (Infectious substances) (ADR 5.2.2.2.2, label model No. 6.2; paraphrase, not yet reviewed)
Packing: Packing instruction P650: Biological substance Category B (UN 3373): triple packaging, UN3373 diamond mark, 1.2 m drop; packed per P650 it is otherwise exempt from ADR. (ADR 4.1.4.1, P650; paraphrase, not yet reviewed)
Tanks: Portable tank instruction T1: Portable tank, Class 1 and 3–9: test 1.5 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.2. Portable tank provision TP1: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.2 (the 97-based formula). Tank code L4BH: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings B, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 4: minimum calculation pressure of 4 bar (see 6.8.2.1.14); B: filling or discharge openings at the bottom, each with 3 closures; H: hermetically closed (see 1.2.1) Tank provision TU15: Tank must not be used to carry foodstuffs, articles of consumption or animal feeds. Tank provision TU37: Tank carriage only for pathogens posing moderate individual risk and low community risk, where effective treatment and prevention exist. Tank provision TE19: Top fittings recessed, valved or shielded against overturning; bottom fittings recessed 200 mm or rail-protected; rear fittings behind the 9.7.6 bumper. Vehicle for tank carriage: AT — Tank vehicle for dangerous goods that is not EX/III, FL or a MEMU: tanks over 1 m³ / 3 m³, or battery-vehicle over 1 m³. (ADR 4.2.5.2.6, portable tank instruction T1, 4.2.5.3, TP1, 4.3.4.1.1, tank code L4BH, 4.3.5, TU15, 4.3.5, TU37, 6.8.4 (b), TE19, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage: Operation provision S3: Infectious substances: 8.1.4.1 table columns (2), (3) and (5) and 8.3.4 do not apply. (ADR 8.5, S3; paraphrase, not yet reviewed)

Assembled from FreightUtils' meanings of the Table A codes, not the official text. A statement marked “not yet reviewed” has not yet been checked against ADR by a person.

In plain words — variant 2 of 2

Labels: Labels: model 6.2 (Infectious substances) (ADR 5.2.2.2.2, label model No. 6.2; paraphrase, not yet reviewed)
Packing: Packing instruction P650: Biological substance Category B (UN 3373): triple packaging, UN3373 diamond mark, 1.2 m drop; packed per P650 it is otherwise exempt from ADR. (ADR 4.1.4.1, P650; paraphrase, not yet reviewed)
Tanks: Portable tank instruction T1: Portable tank, Class 1 and 3–9: test 1.5 bar; shell See 6.7.2.4.2; relief Normal; bottom openings See 6.7.2.6.2. Bulk container code BK1: Bulk carriage in sheeted bulk containers is allowed for the substance, subject to Chapter 6.11 and 7.3.2. Bulk container code BK2: Bulk carriage in closed bulk containers is allowed for the substance, subject to Chapter 6.11 and 7.3.2. Portable tank provision TP1: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.2 (the 97-based formula). Tank code L4BH: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings B, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 4: minimum calculation pressure of 4 bar (see 6.8.2.1.14); B: filling or discharge openings at the bottom, each with 3 closures; H: hermetically closed (see 1.2.1) Tank provision TU15: Tank must not be used to carry foodstuffs, articles of consumption or animal feeds. Tank provision TU37: Tank carriage only for pathogens posing moderate individual risk and low community risk, where effective treatment and prevention exist. Tank provision TE19: Top fittings recessed, valved or shielded against overturning; bottom fittings recessed 200 mm or rail-protected; rear fittings behind the 9.7.6 bumper. Vehicle for tank carriage: AT — Tank vehicle for dangerous goods that is not EX/III, FL or a MEMU: tanks over 1 m³ / 3 m³, or battery-vehicle over 1 m³. (ADR 4.2.5.2.6, portable tank instruction T1, 7.3.2.1, BK1, 7.3.2.1, BK2, 4.2.5.3, TP1, 4.3.4.1.1, tank code L4BH, 4.3.5, TU15, 4.3.5, TU37, 6.8.4 (b), TE19, 9.1.1.2, AT vehicle; paraphrase, not yet reviewed)
Carriage: Operation provision S3: Infectious substances: 8.1.4.1 table columns (2), (3) and (5) and 8.3.4 do not apply. (ADR 8.5, S3; paraphrase, not yet reviewed)

Assembled from FreightUtils' meanings of the Table A codes, not the official text. A statement marked “not yet reviewed” has not yet been checked against ADR by a person.

Class 6.2 — Toxic & Infectious Substances2 variants

UN 3373 has 2 classification variants in ADR 2025 — different hazard divisions or descriptions for the same UN number. Each variant may have different transport requirements.

UN 3373Class 6.2 — Toxic & Infectious SubstancesVariant 1 of 2

BIOLOGICAL SUBSTANCE, CATEGORY B