What is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate and how does it compare across HALS grades?
Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (CAS 52829-07-9, C28H52N2O4) is 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 and polymeric grades. It is a secondary-amine HALS rather than a low-basicity NOR-HALS. 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) |
|---|---|---|---|
| Bis(2,2,6,6-tetramethyl-4-piperidyl) Sebacate you are here | Monomeric | 52829-07-9 | 480.7 |
| Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) 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 | — |
| Bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) Sebacate | Monomeric (NOR) | 129757-67-1 | — |
| Oligomeric Triazine Hindered Amine Light Stabilizer | Oligomeric | 192268-64-7 | 684.1 |
| Oligomeric triazine-piperidine | Oligomeric | 106990-43-6 | 2285.6 |
| Dimethyl Succinate / 4-Hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol Polymer | Polymeric | 65447-77-0 | — |
| Polymeric Triazine-Hexanediamine Hindered Amine Light Stabilizer, tert-Octylamino Type | 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 diffuse quickly for fast protection but migrate and extract more readily; oligomeric and polymeric grades resist volatilization and extraction for long-term durability in thick sections and demanding outdoor exposure. The N-alkoxy NOR-HALS grade 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.
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Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate is the classic monomeric hindered amine light stabilizer, the benchmark low-molecular-weight HALS for protecting plastics against UV degradation. Identity: CAS 52829-07-9.
What it is
Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (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
This HALS 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, a triazine-piperidine HALS and a succinate-piperidine HALS; for coatings compare the liquid bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate.
Forms, grades and handling
This HALS 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. Handle per the current Safety Data Sheet (SDS); each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources this HALS 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 |
| 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 bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate used for?
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 usually used with a UV absorber.
What is the difference between bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate and a polymeric triazine-piperidine HALS?
The sebacate is monomeric (low molecular weight) and the triazine-piperidine HALS is polymeric (high molecular weight). The sebacate is economical and effective but more mobile; the polymeric triazine-piperidine HALS resists migration and volatilization, so it lasts longer in thin films and hot processes.
How is bulk bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate supplied and quoted?
RawSource supplies it 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 Hindered Amine Light Stabilizer (Bis(2,2,6,6-tetramethyl-4-piperidinyl) Sebacate)?
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).