Description

Dicumyl Peroxide (CAS: 80-43-3) is a high-purity organic peroxide widely utilized as a crosslinking agent, vulcanizing agent, and polymerization initiator in industrial and research applications. With the molecular formula C₁₈H₂₂O₂, this thermally decomposable compound is known for its efficiency in free-radical reactions, making it indispensable in polymer chemistry, rubber manufacturing, and specialty material synthesis. Available in multiple formulations (e.g., dry powder, supported on calcium carbonate), it ensures precise control over curing processes for polyethylene, ethylene-propylene-diene monomer (EPDM), and silicone rubbers. Its stability under storage conditions and predictable decomposition kinetics make it a reliable choice for high-temperature applications.

Key Features:

• High reactivity as a radical initiator with a half-life tailored for 115–140°C
• Excellent compatibility with elastomers and thermoplastics
• Available in technical (98%) and stabilized grades (e.g., 40% on CaCO₃)
• Meets industry standards for safety and performance (UN3105, Class 5.2)

Properties

• CAS Number: 80-43-3
• Complexity: 254
• IUPAC Name: [1-methyl-1-(1-methyl-1-phenyl-ethyl)peroxy-ethyl]benzene
• InChI: InChI=1S/C18H22O2/c1-17(2,15-11-7-5-8-12-15)19-20-18(3,4)16-13-9-6-10-14-16/h5-14H,1-4H3
• InChI Key: XMNIXWIUMCBBBL-UHFFFAOYSA-N
• LogP: log Kow = 5.50
• Exact Mass: 270.161979940
• Molecular Formula: C18H22O2
• Molecular Weight: 270.4
• SMILES: CC(C)(C1=CC=CC=C1)OOC(C)(C)C2=CC=CC=C2
• Topological: 18.5
• Monoisotopic Mass: 270.161979940
• Physical Description: Dicumyl peroxide is a white powder with a characteristic odor.
• Color/Form: Crystals from ethanol
• Boiling Point: 266 °F at 760 mmHg
• Melting Point: 40 °C
• Flash Point: Di-cup r, 160 °F ; di-cup t, 160 °F
• Solubility: less than 1 mg/mL at 73 °F
• Density: 1.02
• Vapor Density: 9.3 – Heavier than air; will sink
• Stability/Shelf Life: Stable under recommended storage conditions.
• Synonyms: DICUMYL PEROXIDE, 80-43-3, Cumene peroxide, Cumyl peroxide, dicumylperoxide, Di-Cup, Percumyl D, Perkadox B, Perkadox BC, Perkadox SB, Dicumenyl peroxide, Peroxide, bis(1-methyl-1-phenylethyl), Percumyl D 40, Luperox 500, Luperox 500R, Luperox 500T, Dicumene hydroperoxide, Diisopropylbenzene peroxide, Kayacumyl D, Di-cupr, DiCup 40KE, Active dicumyl peroxide, Di-cup 40C, Varox dcp-R, Varox dcp-T, Isopropylbenzene peroxide, Luperco 500-40C, Luperco 500-40KE, Perkadox BC 9, Di-cup R, Di-cup T, Di-cup 40haf, Perkadox BC 40, Perkadox BC 95, Bis(1-methyl-1-phenylethyl) peroxide, Bis(2-phenyl-2-propyl) peroxide, NSC 56772, Bis(alpha,alpha-dimethylbenzyl)peroxide, Bis(alpha,alpha-dimethylbenzyl) peroxide, .alpha.-Cumyl peroxide, 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene, Di-.alpha.-cumyl peroxide, M51X2J0U9D, DTXSID1025017, .alpha.,.alpha.’-Dicumyl peroxide, MFCD00036227, NSC-56772, Dicumyl Peroxide (contains ca. 60% CaCO3), Bis(.alpha.,.alpha.-dimethylbenzyl) peroxide, Samperox DCP, Perkadox 96, Lupersol 500, DTXCID605017, Di-cup 40ke, Dicup 40, Dicumyl peroxide, dry, Di-Cup 40 KE, CAS-80-43-3, 1,1′-(dioxydipropane-2,2-diyl)dibenzene, CCRIS 4616, HSDB 320, alpha,alpha-Dimethylbenzyl peroxide, EINECS 201-279-3, BRN 2056090, UNII-M51X2J0U9D, Peroxide, bis(alpha,alpha-dimethylbenzyl), Peroximon DC-40, Dicumyl peroxide, 98%, EC 201-279-3, SCHEMBL15450, 4-06-00-03225 (Beilstein Handbook Reference), DICUMYL PEROXIDE [HSDB], CHEMBL1519055, Peroxide,.alpha.-dimethylbenzyl), NSC56772, WLN: 1X1&R&OOX1&1&R, bis(1-methyl-1-phenylethyl)peroxide, Tox21_202385, Tox21_300069, AKOS015838411, AT42242, NCGC00091811-01, NCGC00091811-02, NCGC00091811-03, NCGC00091811-04, NCGC00254166-01, NCGC00259934-01, FD166002, DB-056432, D4894, NS00005939, Peroxide, bis(.alpha.,.alpha.-dimethylbenzyl), Q1210367, (1-Methyl-1-[(1-methyl-1-phenylethyl)peroxy]ethyl)benzene #, Peroxide,4-dichlorobenzoyl)- with phthalic acid, dibutyl ester (1:1)

Dicumyl peroxide is primarily used to crosslink polyethylene cables and pipes, enhancing thermal and mechanical stability. In rubber vulcanization, it improves compression set resistance in EPDM and silicone-based products. It also serves as a curing agent for unsaturated polyester resins and a polymerization initiator for styrene and acrylic monomers. Its controlled decomposition makes it ideal for high-temperature processing in composite materials.

Safety and Hazards

GHS Hazard Statements

• H242: Heating may cause a fire [Danger Self-reactive substances and mixtures; Organic peroxides]
• H315: Causes skin irritation [Warning Skin corrosion/irritation]
• H319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]
• H401: Toxic to aquatic life [Hazardous to the aquatic environment, acute hazard]
• H411: Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P210, P234, P235, P240, P264, P264+P265, P273, P280, P302+P352, P305+P351+P338, P321, P332+P317, P337+P317, P362+P364, P370+P378, P391, P403, P410, P411, P420, and P501

Hazard Classes and Categories

• Org. Perox. F (> 99.9%)
• Skin Irrit. 2 (99.8%)
• Eye Irrit. 2 (99.8%)
• Repr. 1B (31.2%)
• Aquatic Chronic 2 (97.4%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.