Name: Photoinitiator 184 (1-Hydroxycyclohexyl Phenyl Ketone)
Brand: Coatingsink
SKU: photoinitiator-184
Availability: InStock

Question 1

What is the recommended loading level of Photoinitiator 184 in UV coating formulations?

Accepted Answer

Typical dosage is 1–5 phr depending on formulation opacity and film thickness. In clear UV topcoats, 2–3 phr combined with a co-initiator such as ITX or TPO-L gives optimal surface and through-cure. Reduce to 1–2 phr in pigmented systems to avoid surface-cure inhibition from competing chromophores.

Question 2

Which UV lamp sources are compatible with Photoinitiator 184?

Accepted Answer

Photoinitiator 184 absorbs strongly at 246 nm with a secondary band at 280–320 nm, making it highly efficient under medium-pressure mercury UV lamps. It can be used with 365 nm UV-LED sources when paired with a sensitizer such as ITX or thioxanthone. Standalone use with 395 nm LEDs is not recommended due to poor spectral overlap.

Question 3

Is Photoinitiator 184 suitable for food-contact packaging applications?

Accepted Answer

Photoinitiator 184 has FDA clearance under 21 CFR 175.300 for indirect food-contact adhesive applications within approved formulation limits. For direct food-contact or primary packaging, conduct migration testing per EN 13130 or equivalent standards and consult current regulatory guidance before commercialization.

Purity	≥99%
Appearance	Water-white crystalline solid
Melting Point	47–49°C
Absorption Max	246 nm (primary), 280–320 nm (secondary)
Recommended Dosage	1–5 phr

Photoinitiator 184 (1-Hydroxycyclohexyl Phenyl Ketone)

Specifications

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