Unitechem HALS 783
Unitechem

Unitechem HALS 783

Hindered Amine Light Stabilizer — Synergistic Blend

UNITECHEM LS-783

Polymeric HALS Blend  |  LS-944 + LS-622
CAS No.  70624-18-9  /  65447-77-0

Chemical Composition
LS-944 Poly{[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]}
LS-622 Butanedioic acid, dimethyl ester, polymer with 4-hydroxy-2,2,6,6-tetramethyl-1-piperidine ethanol

Typical Properties
CAS No. 70624-18-9 (LS-944)  /  65447-77-0 (LS-622)
Composition ~50% LS-944 (HALS 944)  +  ~50% LS-622 (HALS 622)
Molecular Weight Mn = 2,000–3,100 g/mol (LS-944)  /  Mn = 3,100–4,000 g/mol (LS-622)
Appearance White to slightly yellow pastilles / granules
Melting Range 55 – 140°C
Flash Point 192°C (DIN 51758)
Bulk Density 514 g/L
Volatiles ≤ 0.75%
Ash ≤ 0.1%
Transmittance ≥ 90% @ 425 nm  /  ≥ 94% @ 500 nm
Recommended Level 0.05 – 1.5%

Product Features & Applications

Key Features


Synergistic dual-HALS blend — combines the triazine-based LS-944 and succinate-based LS-622 for superior stabilization vs. either component alone

Versatile for thin and thick sections — excellent cost/performance in LDPE, LLDPE, HDPE films, tapes, thick sections, and PP fibers

Outstanding extraction resistance with low gas fading and minimal pigment interaction

Low volatility and minimal migration — high molecular weight polymeric structure ensures long-term durability

Excellent long-term thermal stability — effective antioxidant contribution from the LS-622 component

Food contact approved — product of choice for thick sections requiring indirect food contact compliance

Applications

LS-783 is particularly effective in LDPE, LLDPE and HDPE films, tapes and thick sections, and PP fibers and films. Application areas include polyolefins (PP, PE), olefin copolymers such as EVA, blends of PP with elastomers, polyurethane, polyformaldehyde, polyamide and polyester. Especially recommended where both high extraction resistance and food contact compliance are required.

Application Substrate Recommended Level
Thick sections HDPE, LLDPE, LDPE, PP 0.05 – 1.0%
Films LLDPE, PP 0.1 – 1.0%
Tapes PP, HDPE 0.1 – 0.8%
Fibers PP fibers 0.1 – 1.4%
PP / PE
HDPE / LLDPE / LDPE
EVA
PU (Polyurethane)
POM (Polyformaldehyde)
PA (Nylon)
Polyester
PP Elastomer Blend
Film & Fiber
Food Contact Applications

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Renewable Energy

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