UN 1242

METHYLDICHLOROSILANE

UN 1242 — ADR 2025 Table A: class 4.3, classification code WFC, packing group I, labels 4.3 +3 +8, special provisions —, limited quantity 0, excepted quantity E0, packing instructions P401, transport category 0, tunnel restriction code (B/E), hazard identification number X338.

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

Table A — ADR 2025 (ECE/TRANS/352), UN 1242
(1) UN No.1242
(2) Name and descriptionMETHYLDICHLOROSILANE
(3a) Class4.3
(3b) Classification codeWFC
(4) Packing groupI
(5) Labels4.3 +3 +8
(6) Special provisions—
(7a) Limited quantities0
(7b) Excepted quantitiesE0
(8) Packaging: packing instructionsP401
(9a) Packaging: special packing provisionsRR7
(9b) Packaging: mixed packing provisionsMP2
(10) Portable tanks and bulk containers: instructionsT14
(11) Portable tanks and bulk containers: special provisionsTP2 TP7
(12) ADR tank: tank codeL10DH
(13) ADR tank: special provisionsTU14 TU24 TE21 TM2 TM3
(14) Vehicle for tank carriageFL
(15) Transport category (Tunnel restriction code)0 (B/E)
(16) Special provisions for carriage: packagesV1
(17) Special provisions for carriage: bulk—
(18) Special provisions for carriage: loading, unloading and handlingCV23
(19) Special provisions for carriage: operationS2 S20
(20) Hazard identification No.X338

ADR 2027 (accepted) — no change for UN 1242

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 (B/E): in tanks, Prohibited in B, C, D, E; in other carriage, Prohibited in E. Tanks: A only. Packages: A, B, C, D. (ADR 8.6.4; from the ADR table itself)
Small-load exemption
Transport category 0: no 1.1.3.6 exemption applies (ADR 1.1.3.6.3; from the ADR table itself)
Labels
Labels: model 4.3 (Substances which emit flammable gases in contact with water), model 3 (Flammable liquids), model 8 (Corrosive substances) (ADR 5.2.2.2.2, label model No. 4.3, 5.2.2.2.2, label model No. 3, 5.2.2.2.2, label model No. 8; paraphrase, not yet reviewed)
Packing
Packing instruction P401: Steel pressure receptacles tested at 6 bar with inert gas blanket, or combination packagings with threaded inners of max 1 l and 30 kg per outer. Special packing provision RR7: RID/ADR only: pressure receptacles for the listed substances must be tested every five years instead of ten. Mixed packing provision MP2: No mixed packing: the goods must be alone in their package. (ADR 4.1.4.1, P401, 4.1.4.1, P401, RR7, 4.1.10.4, MP2; paraphrase, not yet reviewed)
Tanks
Portable tank instruction T14: Portable tank, Class 1 and 3–9: test 6 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 L10DH: ADR tank code for Classes 1 and 3–9: liquid tank, 10 bar, openings D, hermetically closed. — L: tank for liquid-state substances (liquids, or solids handed over molten); 10: minimum calculation pressure of 10 bar (see 6.8.2.1.14); D: filled and discharged from the top; nothing opens below the liquid surface; H: hermetically closed (see 1.2.1) Tank provision TU14: Protective caps on the closures must be locked during carriage. Tank provision TU24: Filling limited to 0.95 kg per litre of capacity by mass, or 85 % by volume. Tank provision TE21: Closures must be protected by lockable caps. Tank provision TM2: Tanks must additionally be marked "Do not open during carriage" and "Gives off flammable gases on contact with water". Tank provision TM3: Plate must also give the proper shipping name and, in kg, the highest load mass permitted for this substance. Vehicle for tank carriage: FL — Vehicle for flammable liquids (flash point ≤ 60 °C), flammable gases or UN 2015 > 60 % in tanks above set sizes. (ADR 4.2.5.2.6, portable tank instruction T14, 4.2.5.3, TP2, 4.2.5.3, TP7, 4.3.4.1.1, tank code L10DH, 4.3.5, TU14, 4.3.5, TU24, 6.8.4 (b), TE21, 6.8.4 (e), TM2, 6.8.4 (e), TM3, 9.1.1.2, FL vehicle; paraphrase, not yet reviewed)
Carriage
Carriage provision V1: Packages must go on a closed or sheeted vehicle or in a closed or sheeted container; open vehicles and containers are not allowed. Loading provision CV23: Take special measures when handling packages so they never come into contact with water. Operation provision S2: Flammable liquids/gases: no ordinary portable lights in closed load compartments; FL heaters off during loading; earth FL vehicles before filling. Operation provision S20: Chapter 8.4 supervision applies above 10 000 kg in packages, or above 3 000 litres in tanks. (ADR 7.2.4, V1, 7.5.11, CV23, 8.5, S2, 8.5, S20; 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 4.3 — Flammable SolidsPacking Group I
UN 1242Class 4.3 — Flammable SolidsPG I
Packing Group
I
High danger
Classification Code
WFC
Tunnel Code
(B/E) meaning →
Code governing tunnel passage
Transport Category
0
For the 1,000-point rule (0 = highest restriction)
Hazard ID No.
X338
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 0
Never exempt — any quantity requires full ADR compliance
Per-substance max
0 kg/L
Per-substance maximum (1.1.3.6.3) — Category 0 is never exempt
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 4.3Label 3Label 8

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

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All Class 4.3 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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