What is HALS-944 and how does it compare across HALS grades?
HALS-944 (CAS 70624-18-9) is a high-molecular-weight polymeric triazine-piperidine hindered-amine light stabilizer. Its polymeric backbone strongly resists volatilization and extraction, favoring long-term durability in polyolefins and thicker sections, in contrast to the low-MW monomeric grades (770, 292) that diffuse faster but migrate more. Bulk quantities are sourced to specification.
- ▸ Long-term UV/light stabilization of polyolefin (PP/PE) films, fibers and molded parts
- ▸ Low-volatility HALS for agricultural and greenhouse films needing extended outdoor life
- ▸ Light stabilization of TPE, PU, PA and PS
- ▸ Weathering protection of thick-section polyolefin 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) | Polymeric | 65447-77-0 | — |
| HALS-944 (triazine-piperidine) you are here | 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 Chimassorb 944 (a BASF product): the same polymeric triazine-piperidine HALS chemistry, CAS 70624-18-9 (the substance is also registered as 71878-19-8). Polymeric grades differ in molecular-weight distribution, so confirm suitability in your polyolefin system; RawSource is independent of BASF. The RawSource TDS and lot CoA govern.
HALS-944 is the polymeric triazine hindered amine light stabilizer that is the workhorse for polyolefins — a high-molecular-weight, non-volatile HALS for long outdoor life, comparable to Chimassorb 944. Identity: CAS 70624-18-9.
What it is
HALS-944 (CAS 70624-18-9) is a high-molecular-weight polymeric triazine-piperidine solid. Its size makes it non-volatile and highly resistant to migration and extraction, and it is exceptionally effective in polyolefins.
How it protects against UV
It scavenges UV-generated radicals through the regenerated nitroxyl cycle and, being polymeric, stays in the part for the long term. It is frequently combined with a monomeric HALS or a UV absorber for a synergistic package.
Applications
HALS-944 is used in polyolefin (PP/PE) films, tapes, fibers, pipe and outdoor moldings, often with a UV absorber and sometimes a monomeric HALS. Compare HALS-622, HALS-2020 and the oligomeric triazine HALS.
Forms, grades and handling
HALS-944 is supplied as a white-to-yellowish 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-944 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 triazine) |
| HALS type | Polymeric (high-MW, triazine) |
| Permanence | Non-volatile; the polyolefin workhorse |
| Comparable to | Chimassorb 944 (nominative reference; generic equivalent) |
| CAS Number | 70624-18-9 |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 615-131-4
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-944 used for?
HALS-944 (CAS 70624-18-9) is a polymeric triazine hindered amine light stabilizer, the workhorse for UV protection of polyolefin films, tapes, fibers, pipe and outdoor moldings. It is non-volatile and migration-resistant, comparable to Chimassorb 944.
Why is HALS-944 preferred for polyolefins?
Its high-molecular-weight polymeric triazine structure is non-volatile and highly resistant to migration and extraction, and it is very effective in polyolefins, giving long outdoor life in films, fibers and moldings.
How is bulk HALS-944 supplied and quoted?
RawSource supplies HALS-944 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-944 Light Stabilizer (Polymeric Triazine-Piperidine HALS)?
HALS-944 Light Stabilizer (Polymeric Triazine-Piperidine HALS) (CAS 70624-18-9) 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 Chimassorb 944 equivalent?
HALS-944 carries the same registered polymeric triazine-piperidine chemistry documented for Chimassorb 944 (CAS 70624-18-9; also registered as 71878-19-8). Match loading in your polyolefin and confirm suitability in a line trial, since polymeric grades can differ in molecular-weight distribution. Chimassorb is a BASF brand; RawSource is independent of BASF.