What is this monomeric C16-18 HALS and how does it compare across HALS grades?
This monomeric hindered-amine light stabilizer (CAS 167078-06-0) is a 2,2,6,6-tetramethyl-4-piperidinyl C16-18 fatty ester. The long alkyl ester improves polymer compatibility and lowers volatility for a monomeric grade, while remaining lower in molecular weight than the oligomeric (2020) and polymeric (622, 944) HALS. Bulk quantities are sourced to specification.
- ▸ Light stabilization of polyolefins (PP/TPO), styrenics and engineering plastics
- ▸ Easy-dispersing, internally lubricating HALS for filled and pigmented compounds
- ▸ Weathering protection for ABS/ASA, PS, PA, POM and PU systems
| 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 you are here | 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 Cyasorb UV-3853 (a Syensqo product; the line was formerly Solvay/Cytec): the same registered chemistry, 2,2,6,6-tetramethyl-4-piperidinyl C16-18 fatty esters, CAS 167078-06-0. Confirm suitability in your polymer system; RawSource is independent of Syensqo. The RawSource TDS and lot CoA govern.
This is a monomeric hindered amine light stabilizer based on tetramethylpiperidinyl C16-18 (stearate-type) esters — a low-volatility monomeric HALS for plastics and masterbatch. Identity: CAS 167078-06-0.
What it is
The monomeric HALS (CAS 167078-06-0) is a tetramethyl-4-piperidinyl long-chain (C16-18) ester. The long fatty-ester chain lowers volatility versus the shortest monomeric grades while keeping monomeric mobility and good dispersion.
How it protects against UV
It scavenges UV-generated radicals through the regenerated nitroxyl cycle. The fatty-ester structure aids compatibility and dispersion in polyolefins and masterbatch.
Applications
It is used to stabilize polyolefins and masterbatch where a low-volatility monomeric HALS with good dispersion is wanted, with a UV absorber. Compare the sebacate monomeric HALS-770 and polymeric HALS-944.
Forms, grades and handling
It is supplied as a waxy solid 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 Monomeric 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 ester) |
| HALS type | Monomeric (low-MW) |
| Permanence | Low-volatility ester |
| CAS Number | 167078-06-0 |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU): Not determined from public registry
- EC number: 605-462-2
TSCA Inventory flag PMN: a commenced PMN (premanufacture notice) substance (EPA flag legend).
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is this monomeric tetramethylpiperidinyl ester HALS used for?
This monomeric hindered amine light stabilizer (CAS 167078-06-0), based on tetramethylpiperidinyl C16-18 esters, is used to UV-stabilize polyolefins and masterbatch; the long fatty-ester chain gives low volatility and good dispersion.
How is bulk this monomeric HALS supplied and quoted?
RawSource supplies this monomeric HALS 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 Monomeric HALS Light Stabilizer (Tetramethylpiperidinyl C16-18 Ester)?
Monomeric HALS Light Stabilizer (Tetramethylpiperidinyl C16-18 Ester) (CAS 167078-06-0) 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 Cyasorb UV-3853 equivalent?
This monomeric HALS carries the same registered chemistry documented for Cyasorb UV-3853: 2,2,6,6-tetramethyl-4-piperidinyl C16-18 fatty esters, CAS 167078-06-0. It is a UVCB ester mixture, so confirm melt-in and loading suitability in your own polyolefin or styrenic compound. Cyasorb is a Syensqo brand; RawSource is independent of Syensqo.