Formula details
Product Details
Overview
Product Overview & Core Functionality
When polyolefins face outdoor environments, solar ultraviolet radiation triggers photo-oxidation, leading to cracking, color loss, and catastrophic mechanical failure. As a premier polymer UV stabilizer, Chimassorb 944 halts this degradation. This high-performance hindered amine light stabilizer protects plastics by trapping free radicals before they can destroy the polymer backbone, drastically extending the service life of outdoor synthetic materials.
Technical Identity & Chemical Summary of Chimassorb 944
Chimassorb 944 is a high-molecular-weight, oligomeric HALS designed for demanding plastic processing environments. Its large molecular size ensures it stays locked inside the polymer matrix rather than migrating to the surface or evaporating during high-temperature extrusion.
| Property | Details |
|---|---|
| Chemical Name | 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]]) |
| CAS Registry Numbers | CAS 71878-19-8 / CAS 70624-18-9 |
| Chemical Class | Oligomeric HALS (High molecular weight hindered amine) |
| Molecular Weight (Mn) | 2000–3100 g/mol |
| Key Trait | Low volatility UV additive with excellent extraction resistance |
Key Performance Benefits in Plastics
- Extreme Extraction Resistance: Due to its high molecular weight, Light Stabilizer 944 resists washing out, making it the industry standard as an agricultural film stabilizer.
- Minimal Volatility: It tolerates high-temperature polymer melt processing without gasifying or causing plate-out on machinery.
- Broad Compatibility: It blends seamlessly into thin and thick-section polyolefins without causing blooming or haze.
- Secondary Heat Stabilization: Beyond solar protection, it provides significant thermal stability during processing and long-term end use.
Hindered Amine Light Stabilizer (HALS) Mechanism
Unlike traditional UV absorbers that merely block or filter incoming light, HALS 944 works via a continuous regenerative scavenging cycle known as the Denisov Cycle:
- Activation: The secondary amine groups in the piperidine rings oxidize into nitroxyl radicals (>N-O^bullet).
- Radical Trapping: These nitroxyl radicals rapidly capture destructive alkyl and alkylperoxyl radicals generated by UV exposure.
- Regeneration: The reaction cycle regenerates the active nitroxyl radical species, allowing a single molecule of Photostabilizer 944 to neutralize thousands of free radicals over years of continuous outdoor exposure.
Technical Specifications & Physical Properties of Chimassorb 944
We maintain strict quality control parameters for our Chimassorb 944 to ensure peak performance across all manufacturing batches. As a premium polymer UV stabilizer, this oligomeric HALS features low volatility and high thermal stability during high-temperature processing.
Product Property Matrix Table and Specs
| Property | Specification / Data |
|---|---|
| Product Name | Chimassorb 944 / HALS 944 |
| CAS Number | 71878-19-8 / 70624-18-9 |
| Appearance | White to light yellow crystalline powder or granules |
| Molecular Weight (Mn) | 2000–3100 g/mol |
| Melting Range | 100°C – 135°C |
| Volatiles | ≤ 0.5% |
| Ash Content | ≤ 0.1% |
| Light Transmittance | 425 nm: ≥ 93% | 500 nm: ≥ 97% |
Molecular Characteristics & Solubility Data
The high molecular weight of this hindered amine light stabilizer yields excellent extraction resistance, making it ideal for products exposed to water or harsh weather. Below is the solubility profile of Light Stabilizer 944 at 20°C (g/100g solvent):
- Acetone: > 50
- Chloroform: > 50
- Hexane: > 40
- Ethyl Acetate: > 30
- Water: < 0.01 (Virtually insoluble)
Testing Methods for Polymer UV Stabilizers
We validate our Photostabilizer 944 shipments using standard international testing protocols to guarantee uniformity:
- Purity & Composition: Verified via High-Performance Liquid Chromatography (HPLC) and Gel Permeation Chromatography (GPC) to confirm the oligomeric weight distribution.
- Volatiles & Ash: Tested using thermal weight loss analysis to ensure low-dust and low-volatility properties during compounding.
- Color & Clarity: Checked using spectrophotometric transmission in toluene solution to ensure the additive will not discolor clear or light-pigmented substrates.
Industrial Applications & Substrate Compatibility
We design and supply Chimassorb 944 to handle the toughest outdoor environments. As a high-molecular-weight oligomeric HALS, it locked down the industry standard for protecting plastics that take a beating from constant sunlight.
Polypropylene (PP) and Polyethylene (PE) Applications
We find that Light Stabilizer 944 performs best in polyolefins where thin cross-sections or high surface areas are exposed to solar radiation. It resists extraction and stays put inside the polymer matrix during extreme weathering.
- PP Fibers & Tapes: Perfect for turf, raffia, stretched tapes, and multi-filament yarns. It prevents the loss of tensile strength and stops fibers from fraying.
- PE Agricultural Films: Extends the working lifespan of greenhouse films and mulch sheets, keeping them intact despite exposure to agrochemicals.
- Injection Molded Parts: Widely used in outdoor crates, automotive trim, garden furniture, and waste bins to prevent chalking, cracking, and color fading.
Recommended Addition Rates & Dosage Guide
Getting the right dosage ensures optimal lifetime protection without over-engineering your formula. We recommend the following addition rates based on substrate type:
| Substrate Type | Application Focus | Recommended Dosage (w/w) |
|---|---|---|
| Polypropylene (PP) | Thick sections, crates, furniture | 0.15% – 0.50% |
| PP Fibers & Tapes | Artificial turf, raffia, yarn | 0.20% – 0.80% |
| Polyethylene (PE) | HDPE molded items, blow molding | 0.10% – 0.40% |
| LLDPE / LDPE | Agricultural films, stretch wraps | 0.20% – 0.80% |
Synergistic Blends with UV Absorbers and Antioxidants
We rarely recommend using HALS 944 completely in isolation if you want maximum longevity. True polymer UV stabilizer performance unlocks when you pair it with complementary additives to create a multi-layer defense system.
- With Benzotriazoles (UV Absorbers): Combine Chimassorb 944 with a UV absorber like Tinuvin 326 for thick-wall parts. The absorber catches the bulk of incoming UV rays at the surface, while the HALS neutralizes free radicals deeper in the substrate.
- With Phosphite & Phenolic Antioxidants: Always pair with primary and secondary antioxidants during compounding. This dual setup protects the resin from thermal degradation during high-temperature extrusion, leaving the light stabilizer fully intact to fight outdoor weathering later.
Greenlano Batch Verification & Quality Assurance
Every batch of Chimassorb 944 undergoes strict quality control to guarantee consistent purity, color stability, and performance. We issue a full Technical Data Sheet (TDS) and Certificate of Analysis (COA) with each shipment to verify critical metrics like melting range, ash content, and active polymer content.
- Purity Assurance: Ultra-low volatile organic content ensures high thermal stability during extrusion.
- Batch Consistency: Minimal lot-to-lot variance prevents processing drift on your production lines.
- Particle Uniformity: Precise particle sizing prevents clogging and ensures smooth masterbatch blending.
Global Chemical Inventory Status, REACH, and TSCA Compliance
Our Chimassorb 944 meets global regulatory requirements for industrial chemical manufacturing and international shipping.
| Compliance Framework | Regional Coverage | Status / Registration |
|---|---|---|
| US TSCA | United States | Active / Fully Listed |
| EU REACH | European Union | Fully Registered / Compliant |
| China IECSC | China | Listed |
| Japan ENCS | Japan | Fully Compliant |
| Canada DSL | Canada | Active / Listed |
Indirect Food Contact Clearances (FDA / EU Regulations)
For agricultural films, food wraps, and flexible packaging, Chimassorb 944 meets global indirect food contact safety thresholds when used within maximum migration limit guidelines.
- US FDA Compliance: Approved under 21 CFR 178.2010 as an antioxidant/stabilizer in polymers for indirect food contact applications.
- EU Food Contact Approval: Complies with EU Regulation No 10/2011 on plastic materials intended to come into contact with food, subject to specific migration limits (SML).
- High Extraction Resistance: Oligomeric structure prevents migration into food products or surrounding liquids, ensuring long-term product safety.
Commercial Packaging & Global Logistics for Chimassorb 944
We supply Chimassorb 944 in multiple physical forms to match your specific factory feeding systems and processing requirements. Our packaging and shipping setups ensure the product arrives intact, uncontaminated, and ready for production anywhere in the world.
Physical Form Options
- UV-944 Granules: Excellent free-flowing properties, ideal for automatic dosing systems with zero airborne dust.
- Low-Dust (LD) Form: Minimizes workplace dust inhalation risks while maintaining quick dispersion during compounding.
- Powder: Maximizes surface area for ultra-homogenous dry blending with polyolefin resins.
Packaging Specifications & Logistics Data
| Metric | Specification |
|---|---|
| Standard Net Weight | 25 kg (55.1 lbs) per unit |
| Primary Packaging | Heavy-duty PE bags or moisture-proof fiber drums |
| Pallet Configuration | 500 kg or 1,000 kg per pallet, stretch-wrapped and strapped |
| FCL Shipping Capacity | Up to 10 MT per 20' FCL (unpalletized) or 9 MT (palletized) |
Storage & Shelf Life Guidelines
To preserve the chemical integrity of this hindered amine light stabilizer, store it according to these strict operational rules:
- Temperature Control: Keep in a cool, dry warehouse environment below 30°C (86°F).
- Moisture Protection: Store away from direct sunlight, rain, and high humidity to prevent caking.
- Shelf Life: 24 months from the manufacturing date when kept in its original, unopened packaging.
Why Source Chimassorb 944 from Greenlano Chemical?
We understand that maintaining product stability while managing manufacturing costs is a massive challenge in today's polymer industry. When you source Chimassorb 944 from us at Greenlano Chemical, you are skipping the middlemen and partnering directly with a dedicated production ecosystem designed to secure your supply chain.
Direct Factory Supply and Bulk Contract Pricing Advantages
We eliminate unnecessary supply chain layers to deliver Chimassorb 944 straight from our production floor to your warehouse. This direct-factory model allows us to offer aggressive bulk contract pricing that keeps your production lines profitable.
- Cost Predictability: Long-term volume contracts shield your operations from sudden market price fluctuations.
- Consistent Quality: Every shipment comes from standardized batches, ensuring your polymer formulations never require unexpected adjustments.
- Scalable Volume: Whether you need standard pallet shipments or multi-ton container loads, our production capacity scales alongside your demand.
Fast Turnaround, Rapid Quotations & Global Export Network
Time to market is everything. A delayed additive shipment can stall an entire production run, which is why we optimized our global logistics network for speed and transparency.
- Rapid Quotations: Our team provides detailed, transparent quotes within 24 hours to keep your procurement moving.
- Strategic Warehousing: We maintain ready-to-ship inventory of Chimassorb 944 to drastically cut down lead times.
- Seamless Global Export: Our logistics experts handle all compliance, customs documentation, and international shipping protocols, ensuring hassle-free delivery directly to your facility, anywhere in the world.
Frequently Asked Questions (FAQs)
What is the difference between Chimassorb 944 and monomeric HALS?
The main difference comes down to molecular weight and volatility. Chimassorb 944 is an oligomeric HALS (high molecular weight), whereas monomeric HALS are low molecular weight additives.
| Feature | Chimassorb 944 (Oligomeric HALS) | Monomeric HALS (e.g., HALS 770) |
|---|---|---|
| Molecular Weight | High (~2000–3100 g/mol) | Low (~480 g/mol) |
| Volatility | Extremely low | Higher migration risk |
| Extraction Resistance | Excellent (water/detergent wash) | Poor (easily washed out) |
| Best Used For | Thin sections, agricultural films, fibers | Thick molded parts, automotive bumpers |
Because HALS 944 is a large, chained molecule, it stays locked inside the polymer matrix. It won't migrate to the surface, evaporate during high-temperature extrusion, or wash away when exposed to elements like rain or chemicals.
Is Chimassorb 944 safe for food contact packaging applications?
Yes. Our Light Stabilizer 944 carries extensive global regulatory clearances for indirect food contact. Its high molecular weight ensures it does not readily migrate out of plastic packaging into food products.
- FDA Compliance: Cleared for use in specific polyolefin films and molded articles under strict thickness and temperature limitations.
- EU Regulation: Compliant with plastics regulations for food-contact materials, subject to specific migration limits (SML).
- Applications: Perfect for manufacturing reusable food crates, bulk handling containers, stretch wraps, and grocery bags.
How does HALS 944 prevent gas fading and thermal degradation?
Gas fading occurs when atmospheric pollutants, like nitrogen oxides ($NO_x$) from gas forklifts or factory emissions, react with antioxidants in the plastic to cause ugly yellow staining. Chimassorb 944 steps in as a highly effective hindered amine light stabilizer to stop this chain reaction.
- Traps Free Radicals: It continuously scavenges alkyl and peroxy radicals formed by heat, shear, and UV exposure before they can degrade the polymer.
- Antioxidant Synergy: It protects your primary and secondary antioxidants from burning out prematurely, preventing the chemical yellowing cycle entirely.
- Processing Protection: It provides excellent long-term thermal stability during both high-heat compounding stages and the final shelf life of the product.
