CBP (CAS 134-85-0)
| CAS No. | 134-85-0 |
|---|---|
| Alias | Chlorobenzophenone |
| Category | Photoinitiators |
| Purity | ≥98.00% (HPLC) |
| Packaging | 25kg/carton |
CBP is a general-purpose free radical photoinitiator often used as an improved alternative to benzophenone. It provides high initiation efficiency and low odor, making it well suited for UV-curable wood coatings and varnishes. It can be used as a direct substitute for benzophenone to produce lower-odor cured products.
Equivalent grades. The same substance is sold by other manufacturers as Omnirad 915. It is the same CAS number (134-85-0) and the same chemistry, so a formulation written around one of those grades transfers directly.
Introduction
CBP is the chlorinated benzophenone, and it exists for formulators who want the BP mechanism with lower odour and a different reactivity profile. Absorption sits at 204 and 258 nm, so like all Type II benzophenones it needs a tertiary amine co-initiator and it is not a sensible choice for LED curing.
In the market it is known by the trade code 915, which is worth knowing when a specification arrives written in brand terms rather than chemical ones.
Physical & Chemical Properties
White crystalline powder. Molecular formula C13H9ClO, molecular weight 216.70, purity ≥98.00% by HPLC, melting range 74.0–76.0 °C, loss on drying ≤0.50%. Absorption maxima at 204 nm and 258 nm.
Applications
Recommended at 3–5%, always with an amine synergist. Suited to UV-curable wood coatings and varnishes, typically as a lower-odour alternative to benzophenone. Also used as a chemical intermediate.
Regulatory status
CBP has no harmonised classification under CLP and is not on the REACH Candidate List. It is not listed in Swiss Annex 10, and it is not on the EU 10/2011 Annex I positive list. As with any benzophenone-family substance, confirm the position for your specific market and end use rather than assuming it follows BP.
Handling & Storage
Store sealed, cool, dry and ventilated. Consult the SDS before handling.
Packaging
20 kg cartons or drums. COA per batch, SDS in English.
Applications & Industries
Coatings & Paints
Metal driers (cobalt, manganese, zirconium octoate, naphthenates) and photoinitiators for coatings, paints, varnishes and industrial finishes — with COA & MSDS per batch.
UV Curing & Printing Inks
Free radical photoinitiators for UV-curable inks, coatings, adhesives and 3D printing — 1173, 184, 369, 907, ITX, DETX, TPO/TPO-L and liquid blends, QC-tested per batch.
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