Name: UV Absorber UV-531 (Hydroxybenzophenone)
Brand: Coatingsink
SKU: uv-absorber-uv531-benzophenone
Availability: InStock

Question 1

What UV wavelength range does UV-531 protect against?

Accepted Answer

UV-531 absorbs strongly across the 270–380 nm UVA range with peak absorption at approximately 288 nm and 325 nm. This provides effective protection against UV-induced yellowing, chalking, and gloss loss in clear and pigmented solventborne coatings.

Question 2

At what loading should UV-531 be used in solventborne topcoats?

Accepted Answer

Recommended dosage is 0.1–2.0% by weight of total formulation. For thin clear coats under 25 µm DFT, 1.0–2.0% is typical; thicker industrial topcoats can use 0.3–0.5%. Loading should be adjusted based on film thickness and expected UV exposure.

Question 3

Can UV-531 be combined with HALS stabilizers?

Accepted Answer

Yes, UV-531 synergizes well with hindered amine light stabilizers (HALS). The benzophenone absorbs incident UV energy while HALS scavenges free radicals generated during photo-oxidation. The combination delivers superior long-term durability versus either additive used alone.

Purity	≥99%
Melting Point	48–51°C
λmax (UVA)	288 nm, 325 nm
Molecular Weight	326.4 g/mol
Appearance	Light yellow flakes or powder

UV Absorber UV-531 (Hydroxybenzophenone)

Specifications

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