TPO (Diphenyl(2,4,6‑trimethylbenzoyl)phosphine oxide)
APO • deep‑cure • 365–405 nm • Type‑I • LED
Purity (HPLC)
≥ 98–99%
Melting range
≈ 90–94 °C
Absorption
λ 350–420 nm (peak ~380–400)
Volatiles (105 °C)
≤ 0.5%
Ash
≤ 0.1%
Particle size
D90 ≤ 10–20 µm (by grade)
Specs below are representative; shipped material conforms to the
lot COA. Choose grade by application (inks vs pigmented coatings
vs 3D resins) and LED wavelength.
| Parameter | Typical | Spec |
|---|---|---|
| Purity (HPLC) | ≥ 99.0% | ≥ 98.0% |
| Melting range | 90–94 °C | — |
| Volatiles (105 °C) | ≤ 0.5% | ≤ 0.8% |
| Appearance | off‑white powder | conforms |
| Parameter | Typical | Spec |
|---|---|---|
| Particle size | D90 ≤ 10 µm | as ordered |
| Purity (HPLC) | ≥ 99% | ≥ 98% |
| Notes | enhanced dispersion in pigmented systems | — |
| Parameter | Typical | Spec |
|---|---|---|
| Purity (HPLC) | ≥ 99.5% | ≥ 99.0% |
| Color (APHA) | ≤ 80 | ≤ 120 |
| Notes | low‑odor, low yellowing for clear coats | — |
| Parameter | Typical | Notes |
|---|---|---|
| Active content | 40–60% | in reactive diluent or solvent |
| Viscosity (25 °C) | pumpable | ready‑to‑blend |
| Stabilization | UV inhibitor added | light‑protected packaging |
| Applications | Packaging | Storage & Handling |
|---|---|---|
|
• **UV/LED inks & clear coats** — fast surface cure, low
yellowing.
• **Pigmented & white coatings** — use micronized grade for better through‑cure. • **3D printing (SLA/DLP)** — deep cure at 385–405 nm; blend with I‑184/1173/819 as needed. |
• 20 / 25 kg cartons or fiber drums (powder); foil‑lined.
• 1 kg aluminum foil bags for R&D. • Liquid dispersions in 20 kg pails / 200 kg drums. |
• Light‑sensitive. Store cool/dry in opaque containers;
keep sealed.
• Avoid dust generation; use local exhaust and PPE. • Observe SDS for classification and transport rules. |
Need an alternative for higher wavelength or low‑migration? We
also supply **TPO‑L (ethyl
phenyl(2,4,6‑trimethylbenzoyl)phosphinate)** and **BAPO** grades —
ask for guidance.