pentane (CAS 109-66-0) — Safety Data Sheet

pentane — CAS 109-66-0, Annex VI index 601-[CAS?]. Below: what the regulatory file for this substance must contain and where such files usually fail.

pentane (CAS 109-66-0) at a glance

• Substance – pentane
• CAS number – 109-66-0
• EC number – 203-692-4
• CLP Annex VI index number – 601-[CAS?]
• Hazard statements – H225 (highly flammable liquid and vapour); H304 (may be fatal if swallowed and enters airways); H336 (may cause drowsiness or dizziness); H411 (toxic to aquatic life with long lasting effects); EUH066
• Hazard classes – Flam. Liq. 2, Asp. Tox. 1, STOT SE 3, Aquatic Chronic 2
• Label pictograms – GHS02, GHS07, GHS08, GHS09
• Signal word – Danger
• Annex VI notes – C
• Entry current as of – CLP00
• CMR classification – not classified as CMR in the harmonised entry
• Documentation issued – safety data sheet in REACH Annex II structure; working draft or signed card
• What is supplied – a document. MolGod.org does not sell, supply or ship chemical substances.

Which GHS pictograms apply to pentane?

The label for pentane carries GHS02 (flame), GHS07 (exclamation mark), GHS08 (health hazard), GHS09 (environment), with the signal word Danger. These are not chosen by the supplier: CLP Annex VI states them for CAS 109-66-0, and the precedence rules in Annex I decide which pictogram is dropped when two would say the same thing. A label showing a different set from the register is wrong even if every hazard statement on it is correct.

What is the EC number for pentane?

Alongside CAS 109-66-0, this substance carries EC number 203-692-4 and Annex VI index 601-[CAS?]. European documentation is built around the EC number as often as around the CAS: registration dossiers, the candidate list and customs systems key on it. A safety data sheet quoting only one of the two forces every downstream reader to look up the other.

Stability, reactivity and incompatibilities

Section 10 documents the stability and reactivity of pentane, outlining specific conditions to be avoided, incompatible materials, and hazardous decomposition products. Laboratories refer to this section prior to storing two substances together on the same shelf to ensure compatibility and safety.

What do customs check when importing pentane?

When a consignment of pentane is stopped at the border, the document examined first is rarely the invoice. It is section 14 of the safety data sheet and its agreement with the transport papers. A missing packing group, an absent UN number or a proper shipping name that contradicts the classification of CAS 109-66-0 will hold the pallet regardless of how complete the remaining fifteen sections are.

In which language must the SDS for pentane be supplied?

The documentation for pentane is limited by its original language. Translation in this context is not an editorial task; hazard statements must use their official wording in each language, as any rephrasing — even if accurate — would result in a document that no longer aligns with the required format. The phrasing is strictly defined and must be reproduced exactly, rather than being interpreted or adapted.

First-aid content and why it is read first

When an exposure to pentane happens, nobody reads sixteen sections. They read section 4, and they read it in the language of the person holding the sheet. Both facts should shape how that section is written and translated.

Why a correct sheet stops being correct

Classification under CLP moves with each Adaptation to Technical Progress. A sheet for CAS 109-66-0 written before the amendment that touched its entry keeps stating a classification the register no longer holds. Nothing in the document announces this — it reads exactly as it did on the day it was issued, which is precisely why revision dates are checked before content.

Purity, certificates and what the sheet does not say

For CAS 109-66-0 the distinction between grades — technical, reagent, analytical — lives in the certificate of analysis and in the specification it is measured against, not in the safety data sheet. Confusing the two is the most common documentation error we see in laboratory procurement.

Can I import pentane into the EU?

An import of CAS 109-66-0 succeeds or fails on whether the accompanying sheet matches the register. Among substances listed in CLP Annex VI the recurring failure is a classification carried over from a supplier outside the Union, where the same substance may be classified differently. Index 601-[CAS?] is the binding reference, and it is in regulated consignments that the discrepancy surfaces.

How is pentane classified for road, sea and air transport?

Section 14 for CAS 109-66-0 carries the UN number, proper shipping name, class, packing group and environmental hazard where these apply. Where the substance is not dangerous for carriage, the section says so explicitly rather than being left empty — an empty section 14 reads as an omission, not as an absence of hazard.

What is the CLP classification of pentane?

The harmonised classification for CAS 109-66-0 carries 5 hazard statements: H225, H304, H336, H411, EUH066. In plain terms this means highly flammable liquid and vapour; may be fatal if swallowed and enters airways; may cause drowsiness or dizziness; toxic to aquatic life with long lasting effects. A harmonised entry is binding across the Union — an importer may not soften it, and a self-classification that diverges from it will not survive an enforcement check.

Protective equipment and exposure controls

Laboratories building a risk assessment for pentane start from section 8. Where an occupational exposure limit exists it must be stated with its source and averaging period; where none exists, the sheet says so rather than leaving the field blank.

Which SDS sections decide whether a shipment clears?

A document for CAS 109-66-0 must follow a specific structure consisting of sixteen sections in the prescribed order, including the required subsections. This format has been established prior to the CLP and continues to be relevant after its implementation. Consequently, adherence to a sixteen-section layout does not necessarily indicate whether the classification information within is up-to-date or current.

What Annex VI notes and concentration limits apply to pentane?

The Annex VI entry for CAS 109-66-0 carries note C. Notes are not commentary: they modify how the classification applies — to concentration ranges, to specific forms of the substance, or to the labelling that follows from it. An entry read without its notes is read incompletely.

What is the UN number for pentane?

For carriage, pentane is assigned UN 1265, transport class 3, packing group II. These entries belong in section 14 of the safety data sheet and must match the shipping papers exactly. A consignment where the sheet and the transport document disagree on the UN number is stopped before anyone reads the remaining fifteen sections.

What must the label for pentane contain?

The supply label for pentane is generated from the same classification that drives the safety data sheet: pictograms selected by precedence, one signal word derived from the highest hazard class present, and the hazard statements H225, H304, H336… reproduced in full. Where the container is too small to carry the complete set at a legible size, there are lawful ways to handle it and unlawful ones that look identical to a non-specialist.

Where is regulatory status recorded for pentane?

Section 15 records regulatory status for pentane: whether it appears on the candidate list, whether it is subject to authorisation or restriction, and any national provisions. Downstream users ask this question routinely, and a sheet that answers it saves an exchange of emails per customer.

Identifiers that must agree

Identity verification must be conducted prior to hazard assessment. If discrepancies exist between the label, safety data sheet, and certificate regarding the CAS 109-66-0 number or if the index 601-[CAS?] refers to a location where the name does not match, a reviewer will lose trust in all three documents simultaneously, despite their internal consistency. This is because inconsistencies among these key documentation elements undermine their reliability as a unified source of information.

Questions about documentation for pentane

Do I need a safety data sheet to import pentane into the EU?

Yes. A sheet compiled to Annex II of REACH must exist before the first consignment moves, and it must be held by the entity placing the substance on the Union market.

What is the CAS number of pentane?

CAS 109-66-0. In CLP Annex VI the same substance carries index number 601-[CAS?], and both identifiers should appear in the documentation.

What hazard statements apply to CAS 109-66-0?

The harmonised entry lists H225, H304, H336, H411. These are binding across the Union and may not be softened by a self-classification.

In which language must the sheet be supplied?

In an official language of each Member State where pentane is placed on the market, unless that State has stated otherwise.

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