What is bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate and how does it compare across HALS grades?
This HALS (CAS 41556-26-7, C30H56N2O4) is a liquid monomeric hindered-amine light stabilizer based on bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate. Its N-methyl (pentamethyl) piperidine structure is frequently chosen for coatings; as a low-MW grade it is more mobile than the oligomeric and polymeric grades. Bulk quantities are sourced to specification.
- ▸ Liquid N-methylated HALS for durable UV/light and gloss protection of automotive, industrial and wood coatings
- ▸ Low-basicity stabilizer compatible with acid-catalyzed coating systems
- ▸ Weathering protection of PU, PVC, ABS/ASA, PS and TPE/SBS articles
| Grade | Structure class | CAS No. | Mol. wt (g/mol) |
|---|---|---|---|
| Bis(2,2,6,6-tetramethyl-4-piperidyl) Sebacate | Monomeric | 52829-07-9 | 480.7 |
| Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) Sebacate you are here | 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(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate is the liquid monomeric HALS standard for coatings — a methylated (N-methyl) sebacate-piperidine that gives excellent light stability in automotive and industrial coatings. Identity: CAS 41556-26-7.
What it is
This HALS (CAS 41556-26-7) is a liquid blend of pentamethyl- and methyl-substituted piperidinyl sebacates. Being liquid, it is easy to meter and disperse in coating formulations, and its N-methyl structure is well suited to clear and pigmented coatings.
How it protects against UV
Like all HALS it scavenges UV-generated radicals through a regenerated nitroxyl cycle rather than absorbing light, giving long-term gloss retention and resistance to fading, chalking and cracking in coatings.
Applications
This liquid HALS is used in automotive coatings, industrial and wood coatings, and clearcoats, paired with a benzotriazole or triazine UV absorber. For acid-catalyzed coatings, compare the NOR-HALS N-alkoxy hindered amine; the solid monomeric option is bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate.
Forms, grades and handling
This HALS is supplied as a clear liquid in drums, IBCs 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, liquid) |
| HALS type | Monomeric (liquid) |
| Permanence | Liquid; for coatings |
| CAS Number | 41556-26-7 |
| Molecular Formula | C30H56N2O4 |
| Molecular Weight | 508.8 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 255-437-1
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate used for?
Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (CAS 41556-26-7) is a liquid monomeric hindered amine light stabilizer used in automotive, industrial and wood coatings and clearcoats for long-term gloss retention and weathering resistance. It is paired with a UV absorber.
Why is this liquid HALS used in coatings?
It is a liquid, so it disperses easily in coating systems, and its N-methyl piperidine structure suits clear and pigmented coatings, giving excellent gloss retention and resistance to fading and cracking.
How is bulk bis(1,2,2,6,6-pentamethyl-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 Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) Sebacate Light Stabilizer?
Bis(1,2,2,6,6-pentamethyl-4-piperidinyl) Sebacate Light Stabilizer (CAS 41556-26-7) is listed as Active on the U.S. EPA TSCA Inventory; its REACH registration status is not determined from the public ECHA registry.