Photoinitiators
Photoinitiator 1173
2-Hydroxy-2-methylpropiophenone
The most widely used liquid Type I initiator — clear, stable and easy to formulate.
Product Description
Photoinitiator 1173 is the most widely used alpha-hydroxy ketone initiator worldwide. As a clear, low-viscosity liquid it dissolves readily in acrylate oligomers and monomers without heating, making formulation and dosing simple even at ambient temperatures.
1173 offers strong absorption in the 250–340 nm region with good thermal stability and low volatility, providing efficient surface cure for varnishes, adhesives and electronics coatings. In white systems it is frequently paired with TPO or 819 to balance surface and through-cure.
Typical use levels are 2–5 wt% in clear coatings and 1–3 wt% in adhesives. Aolong 1173 is distilled under vacuum to reach ≥99.0% assay with very low color (APHA ≤ 80), protecting the clarity of optical and electronics formulations.
Key Features
- Liquid form — dissolves without heating, easy dosing
- Very low color, ideal for optical-clear coatings
- Good thermal and storage stability, low volatility
- Global industry standard with extensive formulation data
Applications
- UV clear coatings for wood, paper and plastics
- UV adhesives for electronics and optical bonding
- Solder masks and printed circuit board inks
- UV gel polishes and cosmetic formulations
- Overprint varnishes and pressure-sensitive adhesives
Specifications
| CAS No. | 7473-98-5 |
|---|---|
| Molecular Formula | C10H12O2 |
| Molecular Weight | 164.20 |
| Appearance | Colorless to pale yellow liquid |
| Assay (GC) | ≥ 99.0% |
| Color (APHA) | ≤ 80 |
| Water Content (KF) | ≤ 0.2% |
| Refractive Index (25 °C) | 1.531 – 1.536 |
Packaging & Storage
25 kg HDPE pail, 200 kg steel drum or 1 kg aluminum-foil bottle. Store cool, dry and protected from light; shelf life 24 months in original sealed packaging.
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