Description
CHLUMINIT® 250 is an iodonium photoinitiator supplied as a nominal 75% active ingredient in 25% propylene carbonate. CAS 344562-80-7 refers to the iodonium salt; CAS 108-32-7 refers to the solvent. It is used in suitable cationically curable epoxy and oxetane formulations.
Omnicat® 250 is a commercial reference with the same nominal composition. Compare active concentration, solvent, batch specifications and curing response rather than assuming automatic interchangeability.
Photoinitiator 250
Nominal composition: (4-Methylphenyl)[4-(2-methylpropyl)phenyl]iodonium hexafluorophosphate (75%) in propylene carbonate (25%).
CAS No: .
344562-80-7 + 108-32-7
Specification
| Appearance | Brown or sorrel liquid |
| Assay | ≥75.0% |
| Purity | ≥98.0% |
| Isomer | ≤2.0% |
Applications
Photoinitiator 250 is used in cationically UV-curable inks, coatings and adhesives based on compatible epoxy or oxetane resins. Photosensitizer selection, pigment loading, film thickness and irradiation conditions influence curing response. Confirm suitability and addition level through trials in the complete formulation.
Recommended Addition levels
The amount of 250 required for optimum performance should be determined in trials covering a concentration range :
white base coatings 1.5 – 3.0 %
flexo inks 1.5 – 4.0 %
screen inks 1.5 – 3.0 %
overprint varnishes 1.0 – 1.5 %
as supplied, in combination with 0.5 – 0.7 % of a photosensitizer, e.g., thioxanthones.
Packaging
250 is available in 20 Kg cans.
Storage & Handling
250 is sensitive to visible light and any exposure to sunlight should be avoided. Opened containers should be closed after use to protect the product against light and moisture. In the presence
of certain vinyl ethers, the stability of 250 can be adversely affected if the formulation is exposed to elevated temperatures. Avoid contact with alkaline additives and water.
Subject to appropriate storage under the usual storage and temperature conditions, our products are durable for at least 24 months.
250 should be handled in accordance with good industrial practice. Further information is provided in the material safety data sheet which is available on request.
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| Photoinitiator PI-905 (oxime ester) | CAS not publicly disclosed |
| Photoinitiator PI-906 (oxime ester) | CAS not publicly disclosed |
| Photoinitiator PI-907 (oxime ester) | CAS confidential |
| Photoinitiator PI-908 (oxime ester) | CAS confidential |
| Photoinitiator PI-991 (oxime ester) | CAS confidential |
| Photoinitiator 250 (75% in propylene carbonate) | CAS 344562-80-7 (75% w/w active ingredient) CAS 108-32-7 (25% w/w propylene carbonate) |
| Diazo-22S (diazo resin, hydrogen sulfate salt) | CAS 41432-19-3 |
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| Photoinitiator 6976 | CAS 71449-78-0 89452-37-9 108-32-7 |
| Photoinitiator 379 | CAS 119344-86-4 |
| Photoinitiator 369 | CAS 119313-12-1 |
| Photoinitiator 160 | CAS 71868-15-0 |
| Photoinitiator 1206 | |
| Photoinitiator 1173 | CAS 7473-98-5 |
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