UN 1801

OCTYLTRICHLOROSILANE

UN 1801 — ADR 2025 Table A: class 8, classification code C3, packing group II, labels 8, special provisions —, limited quantity 0, excepted quantity E0, packing instructions P010, transport category 2, tunnel restriction code (E), hazard identification number X80.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 1801
(1) UN No.1801
(2) Name and descriptionOCTYLTRICHLOROSILANE
(3a) Class8
(3b) Classification codeC3
(4) Packing groupII
(5) Labels8
(6) Special provisions—
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP010
(9a) Packaging: special packing provisions—
(9b) Packaging: mixed packing provisionsMP15
(10) Portable tanks and bulk containers: instructionsT10
(11) Portable tanks and bulk containers: special provisionsTP2 TP7
(12) ADR tank: tank codeL4BN
(13) ADR tank: special provisions—
(14) Vehicle for tank carriageAT
(15) Transport category (Tunnel restriction code)2 (E)
(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—
(20) Hazard identification No.X80

ADR 2027 (accepted) — no change for UN 1801

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)

ADR 2027: no Table A change for this entry (checked against ECE/TRANS/WP.15/274, Add.1 and Corr.1). Other parts of ADR 2027 may still affect its carriage.

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

Tunnels
Tunnel code (E): in tanks, Prohibited in E; in other carriage, Prohibited in E. Every category except E. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 2: at most 333 per transport unit under 1.1.3.6, counted ×3 toward the 1,000-point limit (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 8 (Corrosive substances) (ADR 5.2.2.2.2, label model No. 8; paraphrase, not yet reviewed)
Packing
Packing instruction P010: Glass or steel inner packagings in drums or boxes, steel single drums/jerricans, 6HA1 composites or steel pressure receptacles. Mixed packing provision MP15: Up to 3 litres per inner packaging may be mixed with goods of other codes or classes that permit it, or with non-ADR goods. (ADR 4.1.4.1, P010, 4.1.10.4, MP15; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T10: Portable tank, Class 1 and 3–9: test 4 bar; shell 6 mm; relief See 6.7.2.8.3; bottom openings Not allowed. Portable tank provision TP2: Portable tank must not be filled beyond the degree of filling set by 4.2.1.9.3 (the 95-based formula). Portable tank provision TP7: Air must be removed from the vapour space, by nitrogen or another method. Tank code L4BN: ADR tank code for Classes 1 and 3–9: liquid tank, 4 bar, openings B, valves/devices N. — 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; N: has no 6.8.2.2.6 breather device and is not hermetically closed 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 T10, 4.2.5.3, TP2, 4.2.5.3, TP7, 4.3.4.1.1, tank code L4BN, 9.1.1.2, AT vehicle; 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 8 — Corrosive SubstancesPacking Group II
UN 1801Class 8 — Corrosive SubstancesPG II
Packing Group
II
Medium danger
Classification Code
C3
Tunnel Code
(E) meaning →
Code governing tunnel passage
Transport Category
2
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
X80
Kemler code
Limited Quantity
0
Max per inner package for LQ relief
Excepted Quantity
E0
EQ code for excepted quantity relief
Thresholds — why, not just the verdict
Transport Category
Category 2
×3 points per kg/L — up to 333 kg/L of this substance alone stays under the 1,000-point threshold
Per-substance max
333 kg/L
Per-substance maximum for 1.1.3.6 relief (1.1.3.6.3)
Limited Quantity
Not permitted
No limited-quantity relief for this entry (Chapter 3.4)
Excepted Quantity
E0
No excepted-quantity relief for this entry (Chapter 3.5)
Tunnel Code
Governs which tunnel categories the load may pass
Hazard Labels Required
Label 8

These labels must be displayed on packages and vehicle placards in accordance with ADR 2025.

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Other Corrosive Substances near UN 1801 (Class 8)

UN 1798
NITROHYDROCHLORIC ACID
UN 1799
NONYLTRICHLOROSILANE
UN 1800
OCTADECYLTRICHLORO-SILANE
UN 1802
PERCHLORIC ACID with not more th…
UN 1803
PHENOLSULPHONIC ACID, LIQUID
All Class 8 UN numbers →
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📅Data: UNECE ADR 2025 (ECE/TRANS/352), via EU Directive 2008/68/EC. Last verified October 2026

ADR reference data only. Classification is the consignor's legal responsibility. Consult a DGSA for compliance decisions.

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