# Methyl ethyl ketone peroxide （XJ-MEKP) (CAS 1338-23-4) CAS: 1338-23-4 PubChem CID: 3672772 InChIKey: WFUGQJXVXHBTEM-UHFFFAOYSA-N Wikidata: Q2914590 Molecular formula: C8H18O6 Molar mass: 210.22 g/mol IUPAC: 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane SMILES: CCC(C)(OO)OOC(C)(CC)OO InChI: InChI=1S/C8H18O6/c1-5-7(3,11-9)13-14-8(4,6-2)12-10/h9-10H,5-6H2,1-4H3 logP (XLogP3): 1.3 PSA: 77.4 A^2 Hydrogen bond donors: 2 Hydrogen bond acceptors: 6 Rotatable bonds: 7 Heavy atoms: 14 3D structure: 32 atoms, 31 bonds ## About the compound Methyl ethyl ketone peroxide （XJ-MEKP) (CAS 1338-23-4) is a chemical compound registered under CAS number 1338-23-4. Molecular formula: C8H18O6. Molar mass: 210.22 g/mol. The full systematic IUPAC name is: 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane. The molecule contains 32 atoms connected by 31 chemical bonds. Chemical data comes from the PubChem (NIH), ChEMBL (EBI) and NIST WebBook databases. GHS statement translations comply with the CLP Regulation (EC 1272/2008). Interactive 3D model and 2D skeleton available at: https://molgod.org/molekula/1338-23-4/ ## GHS classification Signal word: Danger Pictograms: GHS01, GHS02, GHS05, GHS06, GHS07, GHS08 Hazard statements (H): H242: Heating may cause a fire H302: Harmful if swallowed H314: Causes severe skin burns and eye damage H318: Causes serious eye damage H332: Harmful if inhaled H227: Combustible liquid H241: Heating may cause a fire or explosion Precautionary statements (P): P210: Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking P203: Obtain, read and follow all safety instructions before use ## Synonyms - 2-BUTANONE PEROXIDE - 1338-23-4 - Methyl ethyl ketone peroxide - Thermacure - Ketonox - Mepox - Esperfoam FR - Lupersol DEL - Butanox LPT - Quickset super - MEKP - Quickset Extra ## Available in the shop Shop: MolGod Product: Methyl ethyl ketone peroxide （XJ-MEKP) (CAS 1338-23-4) — Advanced Qingdao URL: https://molgod.org/sds-cards/methyl-ethyl-ketone-peroxide-%ef%bc%88xj-mekp-cas-1338-23-4-advanced-qingdao/ ## Regulatory compliance checklist Status based on: ADR 2025 (Table A), REACH Annex XVII, CLP Annex VI (harmonised classification), hazard class from the m14-spill DB, SVHC, GIS and the Polish OEL list. Principle: no data = no claim (we do NOT declare "no restrictions" without a basis). 5 required / 12 items [required] SDS (Safety Data Sheet) available (sds) How to comply: Requirement: current SDS compliant with Reg. 1907/2006 (REACH) Annex II, 16-section format. Source / form: https://echa.europa.eu/information-on-chemicals [required] Compliant CLP label (pictograms + signal word + H/P) (clp_label) How to comply: The label must include: GHS pictograms, the signal word (Danger/Warning), hazard (H) and precautionary (P) statements, and manufacturer details. Required since 2010 (substances) and 2015 (mixtures). Source / form: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32008R1272 [required] Chemical OSH training (substance-specific) (bhp_training) How to comply: Laboratory staff: initial training (general induction + job-specific) + refresher training every 5 years (or every 3 for engineering/technical positions). Documentation kept in personnel files. Source / form: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20040180169 [required] BDO registration (Polish Waste Database) (bdo_registration) How to comply: The GHS classification of this substance indicates properties that may render the waste arising from it hazardous (Regulation 1357/2014, HP properties — with concentration thresholds calculated from the content in the waste, not in the reagent). Whether this gives rise to an obligation to keep BDO records depends on the waste producer and the scale of activity (Art. 50 of the Polish Waste Act; exemptions include up to 100 kg/year of hazardous waste). This is not a statement of obligation for the purchaser. Source / form: https://bdo.mos.gov.pl/ [to be verified] ADR transport (international agreement) (adr_transport) How to comply: No ADR data in the MOL-GOD dataset for this CAS number. Do NOT assume there are no restrictions — before shipping, verify the transport classification in ADR 2025 (Table A) and in section 14 of the safety data sheet (SDS). Source / form: https://unece.org/transport/dangerous-goods/adr-2025-files [conditional] REACH registration (>1 t/year EU import) (reach_registration) How to comply: Importers/manufacturers ≥1 tonne/year must register the substance with ECHA (technical dossier + Chemical Safety Report if ≥10 t). Check the ECHA Annex VI / registered substances list. Source / form: https://echa.europa.eu/regulations/reach/registration [to be verified] SVHC notification (Substances of Very High Concern) (svhc_declaration) How to comply: SVHC status not verified against the available dataset — check the current ECHA candidate list; do not assume the absence of an entry. Source / form: https://echa.europa.eu/candidate-list-table [to be verified] REACH Annex XIV (authorisation list) (reach_annex_xiv) How to comply: Not verified against the ECHA Authorisation List — check REACH Annex XIV. Source / form: https://echa.europa.eu/authorisation-list [to be verified] REACH Annex XVII (use/marketing restrictions) (reach_annex_xvii) Source / form: https://echa.europa.eu/substances-restricted-under-reach [to be verified] OEL — Occupational Exposure Limit in the working environment (nds_workplace) How to comply: No NDS data in the MOL-GOD dataset (incomplete set — ~41 of ~600 substances in the list). Absence does NOT mean there is no NDS — check the full list in Dz.U. 2024 poz. 1017 (Regulation of the Ministry of Family and Social Policy of 4 September 2024), and where none exists apply the OEL from EU directives or values recommended by NIOSH/ACGIH. Source / form: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20240001017 [to be verified] GIS register (precursors / psychotropics) (gis_register) How to comply: Does not appear in the available working set of precursors (list incomplete). Absence is NOT a confirmation — verify against Annex I of Reg. (EC) 273/2004 and the GIS list before placing on the market. Source / form: https://www.gov.pl/web/gis [required] Safety Data Sheet in Polish (sds_pl) How to comply: Requirement: SDS in Polish for trade in PL (Art. 31 REACH + Chemical Substances Act Art. 17). Source / form: https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20012112135 ## Data sources - PubChem CID 3672772: https://pubchem.ncbi.nlm.nih.gov/compound/3672772 - Wikidata: https://www.wikidata.org/wiki/Q2914590 - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=1338-23-4 - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=1338-23-4 --- Standalone HTML page: https://molgod.org/molekula/1338-23-4/ Markdown version: https://molgod.org/molekula/1338-23-4.md JSON API: https://molgod.org/wp-json/molgod/v1/molecule/1338-23-4 Last updated: 2026-09-02 Generator: MOL-GOD v3.12.33