What is HALS-770 and how does it compare across HALS grades?
HALS-770 (CAS 52829-07-9, C28H52N2O4) is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, a low-molecular-weight monomeric hindered-amine light stabilizer. As a small, mobile molecule it diffuses readily for fast surface protection, but is more prone to migration and extraction than the oligomeric (2020) and polymeric (622, 944) grades. It is a secondary-amine HALS rather than a low-basicity NOR-HALS (123). Bulk quantities are sourced to specification.
- ▸ Broad-spectrum UV/light stabilization of polyolefins, styrenics, EVA and engineering plastics by nitroxyl radical scavenging
- ▸ Low-molecular-weight HALS giving high mobility and surface protection in coatings and thin sections
- ▸ Weathering and gloss retention in PU, ABS, SAN/ASA and TPE/TPU systems
| Grade | Structure class | CAS No. | Mol. wt (g/mol) |
|---|---|---|---|
| HALS-770 (bis-tetramethylpiperidinyl sebacate) you are here | 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) | 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 770 (a BASF product): the same discrete molecule, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, CAS 52829-07-9. RawSource is independent of BASF; confirm grade-critical specs against the RawSource TDS and lot CoA.
HALS-770 is the classic monomeric hindered amine light stabilizer — bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, the benchmark low-molecular-weight HALS for protecting plastics against UV degradation, comparable to Tinuvin 770. Identity: CAS 52829-07-9.
What it is
HALS-770 (CAS 52829-07-9) is a white crystalline solid, a low-molecular-weight sebacate-piperidine. As a monomeric grade it is highly effective and economical, with the trade-off that it is more mobile than polymeric grades — it can migrate to the surface or volatilize in hot processes.
How it protects against UV
It does not absorb UV; it scavenges the free radicals that UV generates. In service it forms a stable nitroxyl radical that traps propagating radicals and is then regenerated, so it keeps working catalytically at low loading — the regenerative cycle that makes HALS so efficient.
Applications
HALS-770 is used to stabilize polyolefins, styrenics, PVC and many other plastics against UV, often with a UV absorber and a processing antioxidant. For lower volatility and migration resistance in thin films or hot processes, compare the polymeric grades HALS-944 and HALS-622; for coatings compare the liquid HALS-292.
Forms, grades and handling
HALS-770 is supplied as a white crystalline 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-770 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 (monomeric) |
| HALS type | Monomeric (low-MW) |
| Permanence | Effective but can migrate / volatilize |
| Comparable to | Tinuvin 770 (nominative reference; generic equivalent) |
| CAS Number | 52829-07-9 |
| Molecular Formula | C28H52N2O4 |
| Molecular Weight | 480.7 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 258-207-9
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is HALS-770 used for?
HALS-770 (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, CAS 52829-07-9) is a monomeric hindered amine light stabilizer used to protect polyolefins, styrenics, PVC and other plastics from UV degradation. It is comparable to Tinuvin 770 and is usually used with a UV absorber.
Is HALS-770 the same as Tinuvin 770?
HALS-770 is the generic equivalent of the grade sold under the Tinuvin 770 brand — the same chemistry (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate). The brand name is used only as a nominative reference; RawSource is not affiliated with the brand owner.
What is the difference between HALS-770 and HALS-944?
HALS-770 is monomeric (low molecular weight) and HALS-944 is polymeric (high molecular weight). HALS-770 is economical and effective but more mobile; HALS-944 resists migration and volatilization, so it lasts longer in thin films and hot processes.
How is bulk HALS-770 supplied and quoted?
RawSource supplies HALS-770 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-770 Hindered Amine Light Stabilizer (Bis(2,2,6,6-tetramethyl-4-piperidinyl) Sebacate)?
HALS-770 Hindered Amine Light Stabilizer (Bis(2,2,6,6-tetramethyl-4-piperidinyl) Sebacate) (CAS 52829-07-9) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 258-207-9).