The Wrong Photoinitiator Doesn’t Just Underperform — It Costs You a Production Run I’ve been in photoinitiator supply for over seven years. The most expensive call I get isn’tfrom someone asking which initiator to buy. It’s from someone who already bought the wrongone and is now three weeks into a failed formulation, a stopped production … Read more
Quick Answer: TPO (CAS 75980-60-8) delivers faster cure speed and higher initiation efficiency. TPO-L (CAS 84434-11-7) is a liquid with lower toxicity, reduced yellowing, and zero EU regulatory restrictions. For most UV coating, ink, and adhesive factories shipping to Europe, TPO-L is the safer long-term procurement choice — but you’ll need 1.5–2x higher loading to … Read more
Quick Answer ITX (2-Isopropylthioxanthone, CAS 5495-84-1) and DETX (2,4-Diethylthioxanthone, CAS 82799-44-8) are both Norrish Type II thioxanthone photoinitiators used in UV-curable inks, coatings, and adhesives. Both require an amine co-initiator to generate radicals. Both function as sensitizers for Type I photoinitiators like TPO and 819. They are not interchangeable. Parameter ITX DETX CAS Number 5495-84-1 … Read more
Quick AnswerPhotoinitiator 1173 (CAS 7473-98-5) is a liquid. Photoinitiator 184 (CAS 947-19-3) is a solid. Both are Norrish Type I alpha-hydroxy ketones with nearly identical UV absorption peaks (320–335 nm) and excellent non-yellowing profiles. Decision Factor Choose 1173 Choose 184 Production format Liquid mixing systems Solid-fed or high-temp batch Handling complexity Low — no pre-dissolution … Read more
The Side-by-Side That Drives the Decision Start here. Every recommendation in this article flows from these parameters. Parameter Photoinitiator 1173 Photoinitiator TPO Chemical Class Alpha Hydroxy Ketone (Norrish Type I) Acylphosphine Oxide (Norrish Type I) CAS Number 7473-98-5 75980-60-8 Common Synonyms Darocur 1173, Omnirad 1173, HMPP Darocur TPO, Lucirin TPO, Omnirad TPO Absorption Peak (λmax) … Read more
Quick Answer 1. Choose TPO when your system is clear, colorless, or cost-sensitive, and your end market is outside EU regulatory scope. Best for: clear varnishes, wood coatings, water-based UV, standard adhesives. Price: $12–20/kg FOB China. 2. Choose 819 (BAPO) when you need deep cure through pigment, thick-film penetration, or compliance headroom for European markets. … Read more