Isononanoic Acid Regulatory Guide: REACH, TSCA, SVHC, HAP & Global Compliance

What the clean profile actually means for downstream users - and where it stops transferring to derivatives.

💡 Quick answer: Isononanoic acid (CAS 26896-18-4, EC 248-191-6) carries Skin Irrit. 2 (H315) and Eye Irrit. 2 (H319) under EU CLP - mild irritant only, no CMR classification. It is REACH registered, not on the SVHC Candidate List, not subject to Annex XIV authorisation or Annex XVII restriction. In the US it is TSCA-listed and confirmed non-HAP under Clean Air Act Section 112(b). It is a Combustible Liquid Class III-B (flash point ~105–113 °C).

ℹ️ Please note: this article is general technical information, not legal or regulatory advice. Regulatory lists change - the SVHC Candidate List is updated periodically, and national inventories evolve. Always verify current status against the primary sources linked throughout before making procurement, registration or labelling decisions.

✅ Registration. INA is REACH registered under EC 248-191-6. EU importers and downstream users should confirm their supplier's registration covers the intended tonnage band and use.

✅ SVHC Candidate List - not listed. This matters more than it first appears. Substances on the Candidate List trigger Article 33 communication duties down the supply chain and SCIP database notification for articles. INA's absence removes that administrative burden for its downstream derivatives.

✅ Annex XIV (Authorisation) - not subject. No sunset date, no authorisation application needed for continued EU use.

✅ Annex XVII (Restrictions) - not restricted. No use, concentration or article restrictions apply to the substance itself.

✅ TSCA Inventory - listed. INA appears on the TSCA Chemical Substance Inventory, so it may be manufactured, imported and processed in the US without a Premanufacture Notice.

✅ Non-HAP. INA is not a listed Hazardous Air Pollutant under Section 112(b) of the Clean Air Act (EPA CompTox DTXSID4027127). US facilities avoid the HAP emission tracking and MACT control obligations that apply to 2-EHA users - often a material operating-cost difference at scale.

⚠️ Combustible Liquid Class III-B. Flash point ~105–113 °C. Standard combustible-liquid storage is adequate; no explosion-proof electrical infrastructure is required. But note this flash point is lower than both 2-EHA (~116 °C) and neodecanoic acid (~140 °C) - do not relax fire precautions when substituting. The full three-way property comparison is in the branched-acid selection guide.

⚠️ Metal salts inherit the metal's classification. Cobalt isononanoate carries Repr. 1B from the cobalt ion, entirely independent of the carboxylate ligand. Substituting INA for 2-EHA does not declassify a cobalt drier. The same principle applies to any metal with its own hazard profile.

✅ Where the acid's profile genuinely helps: zirconium, bismuth, zinc, calcium, cerium and manganese isononanoates - derivatives where the acid ligand's status meaningfully shapes the classification of the finished salt.

🔹 Esters are new substances. An isononanoate polyol ester or plasticiser is its own substance with its own CAS, its own registration requirement and its own classification. It is not covered by the acid's registration.

🔹 Rule of thumb: assess every derivative on its own merits. Use the acid's clean profile as a starting advantage, never as a conclusion.

🔹 China - IECSC (Inventory of Existing Chemical Substances in China), administered under MEE regulations.

🔹 South Korea - K-REACH, with its own registration and notification thresholds.

🔹 Japan - CSCL / ISHL inventory listings.

🔹 UK - UK REACH, operating separately from EU REACH since Brexit.

🔹 Others - Canada DSL, Australia AICIS, Taiwan TCSI, Philippines PICCS, and further national inventories as applicable to your destination markets.

✅ EU CLP Safety Data Sheet - showing mild irritant classification, no CMR

✅ REACH registration confirmation (EC 248-191-6)

✅ Non-SVHC letter - supporting your Article 33 / SCIP position

✅ Non-HAP declaration (CAS 26896-18-4) - for US air-permit files

✅ TSCA inventory confirmation

✅ Batch COA - purity, isomer content, acid value, colour, water

✅ Comparative INA vs 2-EHA regulatory summary - for substitution justification

🔹 Is isononanoic acid an SVHC?

No. Isononanoic acid is not on the REACH SVHC Candidate List, and is not subject to Annex XIV authorisation or Annex XVII restriction. Because the Candidate List is updated periodically, verify current status via ECHA before EU procurement for regulated applications.

🔹 Is isononanoic acid a hazardous air pollutant (HAP)?

No. It is confirmed non-HAP under Section 112(b) of the US Clean Air Act, so US facilities using it avoid the HAP emission tracking and MACT control obligations that apply to 2-EHA.

🔹 What CLP classification does isononanoic acid carry?

Skin Irrit. 2 (H315) and Eye Irrit. 2 (H319) - mild irritant only, with no carcinogenic, mutagenic or reproductive-toxicant classification. Nitrile gloves and safety goggles are the routine PPE requirement.

🔹 Does the acid's clean status apply to the metal salts I make from it?

Not automatically. Metal salts inherit the metal's own classification - cobalt isononanoate still carries Repr. 1B from the cobalt ion. Esters are separate substances with separate registration and classification. Assess every derivative independently.

Isononanoic Acid vs 2-EHA

The Repr. 1B-free substitution roadmap and documentation pack. →

INA Quality & COA Guide

Reading purity, acid value, colour and water on a certificate. →

INA Market Trends & Demand Outlook

How regulation is reshaping branched-acid demand. →

✅ Need the Full Compliance File? Sinolook Supplies It

Every INA shipment ships with EU CLP SDS, REACH registration confirmation, non-SVHC letter, non-HAP declaration, TSCA confirmation and batch COA - plus a comparative INA vs 2-EHA regulatory summary on request for substitution documentation.