- ▸ Liquid Type II benzophenone-derivative co-initiator/synergist for low-migration surface cure of UV coatings (Coatings & Construction)
- ▸ Liquid initiator improving solubility in UV/UV-LED inks and varnishes (Industrial Manufacturing)
- ▸ Cures UV-curable plastics and adhesives in amine-synergist systems (Plastics & Polymers)
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
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Methyl 2-benzoylbenzoate (OMBB) is a liquid-compatible Type II benzophenone-type photoinitiator. The methyl-ester group improves solubility and lowers volatility/migration versus benzophenone, making it a handling-friendly surface-cure initiator used with an amine synergist. Identity: CAS 606-28-0.
What it is
Methyl 2-benzoylbenzoate (CAS 606-28-0) is an ortho-benzoyl benzoate ester. The ester group makes it more soluble and less volatile than benzophenone, so it is favored in liquid systems and where lower odor/migration is wanted.
How it cures
A Type II initiator that abstracts hydrogen from an amine co-initiator under UV to form curing radicals. It behaves like benzophenone but with better solubility and lower volatility. Pair with an amine synergist such as EDB or EHA.
Applications
Used for surface cure of UV coatings, varnishes and inks where good solubility and low odor/volatility are wanted, alongside a Type I initiator for through cure. Compare benzophenone and 4-methylbenzophenone.
Forms, grades and handling
Methyl 2-benzoylbenzoate is supplied as a low-melting solid / liquid-compatible grade. Photoinitiators are light-sensitive — store cool, dry and dark, away from light and ignition sources. Handle per the current Safety Data Sheet (SDS); each lot ships with a Certificate of Analysis (CoA) and Technical Data Sheet (TDS).
Bulk supply and RFQ
RawSource sources Methyl 2-Benzoylbenzoate direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your lamp (mercury or LED wavelength), system (clear or pigmented) and cure target, and we will quote the right grade. Compare the full range and selection logic in the photoinitiators guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / type | Photoinitiator (Type II, benzophenone ester) |
| Photoinitiator type | Type II (H-abstraction) |
| Absorption | UV (mercury-lamp range) |
| CAS Number | 606-28-0 |
| Molecular Formula | C15H12O3 |
| Molecular Weight | 240.25 g/mol |
| Handling | Light-sensitive; refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 210-112-3
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is methyl 2-benzoylbenzoate used for?
Methyl 2-benzoylbenzoate (OMBB, CAS 606-28-0) is a Type II photoinitiator for UV surface cure, chosen for better solubility and lower volatility/odor than benzophenone; it is used with an amine synergist.
How is bulk methyl 2-benzoylbenzoate supplied and quoted?
RawSource supplies methyl 2-benzoylbenzoate in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your target quantity.
What is the REACH and TSCA regulatory status of Methyl 2-benzoylbenzoate (OMBB)?
Methyl 2-benzoylbenzoate (OMBB) (CAS 606-28-0) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 210-112-3).