What is HALS-622 and how does it compare across HALS grades?
HALS-622 (CAS 65447-77-0) is a polymeric hindered-amine light stabilizer built on a succinate/tetramethylpiperidinol polyester backbone. Like HALS-944 it is a high-MW, extraction-resistant grade for long-term light stability, distinct from the mobile monomeric grades (770, 292) that diffuse faster but migrate more. Bulk quantities are sourced to specification.
- ▸ Long-term light stabilization of polyolefin (PP/PE) films and fibers
- ▸ Low-volatility, extraction-resistant HALS for thin-gauge agricultural and packaging films
- ▸ Weathering protection for TPU, EVA and polyacetal parts
| Grade | Structure class | CAS No. | Mol. wt (g/mol) |
|---|---|---|---|
| HALS-770 (bis-tetramethylpiperidinyl sebacate) | Monomeric | 52829-07-9 | 480.7 |
| HALS-292 (bis-pentamethylpiperidinyl sebacate) | Monomeric (liquid) | 41556-26-7 | 508.8 |
| Bis-piperidinyl isophthalamide | Monomeric | 42774-15-2 | 442.6 |
| Monomeric C16-18 piperidinyl ester | Monomeric | 167078-06-0 | — |
| HALS-123 (N-alkoxy NOR-HALS) | Monomeric (NOR) | 129757-67-1 | — |
| HALS-2020 (triazine-piperidine) | Oligomeric | 192268-64-7 | 684.1 |
| Oligomeric triazine-piperidine | Oligomeric | 106990-43-6 | 2285.6 |
| HALS-622 (succinate-piperidinol polyester) you are here | Polymeric | 65447-77-0 | — |
| HALS-944 (triazine-piperidine) | Polymeric | 70624-18-9 | — |
How to choose: HALS are 2,2,6,6-tetramethylpiperidine radical scavengers that regenerate to protect polymers and coatings from UV and thermal oxidation. They are grouped by molecular weight and structure, which sets mobility versus permanence: monomeric grades (770, 292) diffuse quickly for fast protection but migrate and extract more readily; oligomeric and polymeric grades (2020, 622, 944 and the oligomeric triazine) resist volatilization and extraction for long-term durability in thick sections and demanding outdoor exposure. The N-alkoxy NOR-HALS grade (123) carries lower basicity, improving compatibility with acid-cure coatings and flame-retarded or agrochemical-exposed systems where basic HALS can be neutralized.
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A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Cross-reference: comparable to Tinuvin 622 (a BASF product): the same registered polymer chemistry, a dimethyl succinate / tetramethylpiperidinol polyester, CAS 65447-77-0. Polymeric grades differ in molecular-weight distribution, so confirm suitability in your compound; RawSource is independent of BASF. The RawSource TDS and lot CoA govern.
HALS-622 is a polymeric hindered amine light stabilizer — an oligomer of dimethyl succinate and a tetramethylpiperidine alcohol that is essentially non-volatile and resists migration, comparable to Tinuvin 622. Identity: CAS 65447-77-0.
What it is
HALS-622 (CAS 65447-77-0) is a high-molecular-weight polymeric (succinate-piperidine) solid. Its polymeric backbone makes it non-volatile and resistant to extraction and migration, so it stays in the part through hot processing, thin films and water/solvent contact.
How it protects against UV
It scavenges UV-generated radicals through the regenerated nitroxyl cycle. The polymeric structure trades a little initial mobility for long-term permanence — ideal where the stabilizer must not bloom, volatilize or wash out.
Applications
HALS-622 is used in polyolefin films and fibers, thin sections and demanding outdoor parts, often with a UV absorber and a triazine HALS. Compare the polymeric triazine HALS-944 and the monomeric HALS-770.
Forms, grades and handling
HALS-622 is supplied as a white polymeric powder/granule in bags and bulk. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Brand names appear only as nominative cross-references to the generic equivalent we supply — RawSource is not affiliated with those brand owners. Handle per the current Safety Data Sheet (SDS); each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources HALS-622 direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your polymer, part thickness and service life, the chemical environment (acidic, flame-retarded, agrochemical), and whether you need a complete UV-absorber-plus-HALS package, and we will quote it. See the full range and selection logic in the HALS guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Hindered amine light stabilizer (polymeric) |
| HALS type | Polymeric (high-MW) |
| Permanence | Non-volatile; migration-resistant |
| Comparable to | Tinuvin 622 (nominative reference; generic equivalent) |
| CAS Number | 65447-77-0 |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 687-680-8
TSCA Inventory flag XU: a substance exempt from reporting under the Chemical Data Reporting Rule (40 CFR 711) (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is HALS-622 used for?
HALS-622 (CAS 65447-77-0) is a polymeric hindered amine light stabilizer used in polyolefin films and fibers and thin sections where permanence matters; it is non-volatile and migration-resistant, comparable to Tinuvin 622.
Why choose a polymeric HALS like 622?
Polymeric HALS are essentially non-volatile and resist migration and extraction, so they keep protecting thin films, hot-processed parts and items in contact with water or solvents, where monomeric grades could be lost.
How is bulk HALS-622 supplied and quoted?
RawSource supplies HALS-622 in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your polymer, service life and environment.
What is the REACH and TSCA regulatory status of HALS-622 Polymeric Light Stabilizer (Hindered Amine Light Stabilizer)?
HALS-622 Polymeric Light Stabilizer (Hindered Amine Light Stabilizer) (CAS 65447-77-0) is listed as Active on the U.S. EPA TSCA Inventory; its REACH registration status is not determined from the public ECHA registry.
Is there a Tinuvin 622 equivalent?
HALS-622 carries the same registered polymer chemistry documented for Tinuvin 622: a dimethyl succinate / tetramethylpiperidinol polyester, CAS 65447-77-0. Polymeric HALS grades can differ in molecular-weight distribution and melt behavior, so run your own suitability trial before switching. Tinuvin is a BASF brand; RawSource is independent of BASF.