Name: Oligomeric HALS 622
Brand: Coatingsink
SKU: hals-622-oligomeric
Availability: InStock

Question 1

How does oligomeric HALS 622 differ from low-molecular-weight HALS grades?

Accepted Answer

Oligomeric HALS 622 has a number-average molecular weight of 2000–4000 g/mol, which dramatically reduces volatility and leaching compared to monomeric HALS (MW ~400–500 g/mol). This high retention makes it the preferred choice for thin-film exterior clearcoats and automotive topcoats where long-term radical-scavenging activity is critical.

Question 2

Can HALS 622 be combined with UV absorbers in the same formulation?

Accepted Answer

Yes, and this is the recommended approach. HALS 622 acts as a radical scavenger rather than a UV screener, so combining it with a benzotriazole or triazine UV absorber creates a synergistic system. A typical starting point is 0.5–1.0% HALS 622 plus 0.3–0.8% UV absorber, providing complementary mechanisms for comprehensive photostabilisation.

Question 3

Is HALS 622 suitable for acid-catalysed melamine crosslinked clearcoats?

Accepted Answer

HALS 622 shows good compatibility with melamine-crosslinked systems; however, highly acidic catalysts can protonate the piperidine nitrogen and temporarily reduce HALS efficiency. In strongly acidic cure systems (pH <4), an NOR-HALS or a HALS blend specifically evaluated for acid tolerance should be considered. Pre-testing with the target catalyst loading is recommended.

Appearance	White to off-white powder
Amine Content	~6.0 meq/g
Melting Point	100–120°C
Molecular Weight	2000–4000 g/mol
Recommended Dosage	0.5–2.0%

Oligomeric HALS 622

Specifications

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