What is this bis-piperidinyl isophthalamide HALS and how does it compare across HALS grades?
This monomeric hindered-amine light stabilizer (CAS 42774-15-2, C26H42N4O2) is N,N'-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide. Its amide-linked, aromatic isophthalamide core raises thermal stability versus aliphatic sebacate diesters (770), suiting higher-temperature polymers such as polyamides. Bulk quantities are sourced to specification.
- ▸ Light and heat stabilization of polyamide (nylon) engineering parts and fibers
- ▸ Improves dye uptake/lightfastness and thermo-oxidative stability in PA fibers, carpets and textiles
- ▸ Reduces gas-fume yellowing and processing degradation of polyamide compounds
| 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 you are here | 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.
Plastics & polymers solutions · Coatings solutions · Browse all products
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 →
This is a piperidinyl isophthalamide hindered amine — a specialty HALS for polyamide (nylon) that also acts as a nucleating and process stabilizer, comparable to Nylostab S-EED. Identity: CAS 42774-15-2.
What it is
The piperidinyl isophthalamide (CAS 42774-15-2, N,N’-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide) is a crystalline solid. Its amide structure makes it especially suited to polyamides, where it stabilizes against light and heat and improves crystallization.
How it protects against UV
It scavenges UV-generated radicals through the hindered-amine nitroxyl cycle, and in nylon it additionally acts as a nucleating agent and process/thermal stabilizer, improving color, processing and mechanical consistency.
Applications
It is used in polyamide (PA6, PA66) fibers and moldings as a light/heat stabilizer and nucleator, and in other engineering plastics. For polyolefins compare HALS-944; for coatings HALS-292.
Forms, grades and handling
It is supplied as a crystalline powder 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 Piperidinyl Isophthalamide 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 / nucleator (for polyamide) |
| HALS type | Monomeric (amide; nucleating) |
| Permanence | For polyamide; stabilizer + nucleator |
| Comparable to | Nylostab S-EED (nominative reference; generic equivalent) |
| CAS Number | 42774-15-2 |
| Molecular Formula | C26H42N4O2 |
| Molecular Weight | 442.6 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 419-710-0
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 the piperidinyl isophthalamide HALS used for?
This piperidinyl isophthalamide hindered amine (CAS 42774-15-2) is a specialty HALS for polyamide (nylon) that stabilizes against light and heat and also acts as a nucleating agent; it is comparable to Nylostab S-EED.
How is bulk this polyamide HALS supplied and quoted?
RawSource supplies this polyamide 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 N,N'-Bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide (isophthalamide)?
N,N'-Bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-benzenedicarboxamide (isophthalamide) (CAS 42774-15-2) 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 419-710-0).