NPI-704 (CAS 84434-11-7, 75980-60-8, 162881-26-7)
| CAS No. | 84434-11-7, 75980-60-8, 162881-26-7 |
|---|---|
| Alias | Mixed free radical photoinitiator |
| Category | Photoinitiators |
| Purity | ≥98.00% (GC) |
| Packaging | 25kg/pail |
NPI-704 is a mixed free radical photoinitiator with a long absorption wavelength, excellent deep curing performance, and photo-bleaching properties. It is particularly suitable for LED curing coatings and inks, offering lower odor and easier handling compared to TPO. Recommended for use in UV-curable coatings and inks, it can be combined with 184 for balanced performance.
Introduction
NPI-704 is a liquid blend of three phosphine-oxide and phosphinate initiators, supplied as a yellow transparent liquid so it can be dosed without any powder handling. It exists for formulators who want TPO-class LED performance but would rather not deal with a solid that needs a premix step.
The blend is the point. Combining a phosphinate with two phosphine oxides broadens the absorption across the 380–420 nm region that LED arrays occupy, and the liquid form means loading adjustments can be made incrementally. Odour and handling are both easier than with straight TPO powder.
Physical & Chemical Properties
Yellow transparent liquid. Blend of CAS 84434-11-7 (TPO-L), 75980-60-8 (TPO) and 162881-26-7 (BAPO). Purity ≥98.00% by GC. Liquid at room temperature, so no melting range applies. Recommended at 1–3% in coatings and 5–10% in inks.
Applications
LED-curable coatings and inks, particularly where through-cure in a pigmented or thick film is the limiting factor. Can be combined with 184 for a more balanced cure across the film.
Regulatory status
This blend contains TPO, and that is the fact that governs its regulatory position. Because the TPO component is present, the same considerations apply: TPO is an SVHC with a harmonised Repr. 1B classification, it was brought into Annex XVII via Appendix 6 to Entry 30 by Commission Regulation (EU) 2025/1731, it was removed from the EuPIA suitability list in January 2026, and ECHA recommended it for the Authorisation List in November 2025. The BAPO component has no such file. The TPO-L component is not caught by that Annex XVII entry.
If you are substituting NPI-704 for a TPO-based formulation to solve a handling problem, note that it solves the handling problem and not the regulatory one. If you need both solved, tell us the application and we will suggest a blend that does not contain TPO. See the TPO page for the detail.
Packaging
Packaging as agreed at order. 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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Frequently Asked Questions
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