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Levelling Agent HL988 is a polyacrylate-based leveling additive used in powder coatings and thermoset resin systems to improve surface smoothness, gloss, and defect-free film formation.
Levelling Agent HL988 is designed to help molten coating films flow evenly before curing locks the structure in place.
Levelling Agent HL988 makes it an important functional additive in coating technology.
CAS Number: 9003-01-4
Molecular Formula: C5H10O2
Molecular Weight: 102.1317
EINECS Number: 618-347-7
Synonyms: POLYACRYLIC ACID 250,000;Polyacrylic Acid (Sodium);Polyacrylicacidextrapure;approx. M.W. 240,000;approx. M.W. 5,000;approx. M.W. 2,000;Poly(acrylic acid), 63 wt% solution in water;Poly(acrylic acid), sec. stand., aver. MW 1,080,000, aver. MN 135,000
Levelling Agent HL988 is typically a high-performance polyacrylate polymer (often carried on silica or similar inert carriers for easier handling) that migrates to the coating surface during the melt phase.
This migration reduces surface tension differences across the coating film.
Levelling Agent HL988 makes it important in polymer surface engineering.
Levelling Agent HL988s main function is to reduce surface tension and improve wetting of the substrate, allowing the coating to spread uniformly and eliminate defects such as craters, pinholes, and orange peel texture.
This improves both visual appearance and protective quality.
Levelling Agent HL988 makes it essential in surface finishing chemistry.
Levelling Agent HL988 is best described as a specialized powder coating additive that enhances flow behavior, surface leveling, and final gloss in epoxy, polyester, polyurethane, and hybrid coating systems.
Its role is physical surface control rather than chemical reaction.
Levelling Agent HL988 makes it widely used in industrial coating formulations.
Levelling Agent HL988 is a hydrophilic colloidal solution, similar in properties to water-soluble natural gums.
It is a clear, colorless, viscous stable solution.
Applications include the modification of aqueous formulations for such end uses as cleaners, binders, adhesives, and emulsion paints.
The sodium, potassium, and ammonium salts are effective thickeners and dispersants useful in both natural and synthetic latex systems.
Levelling Agent HL988 in ceramic applications improves dry strength, dispersant action, and improved workability of the clays.
Levelling Agent HL988 is stable to hydrolysis and is not susceptible to bacterial degradation.
These leveling agents act during the early curing stage of coatings, when viscosity is still low and surface movement (flow-out) determines final film quality.
They migrate toward the surface and help the coating “self-level” before solidification.
Levelling Agent HL988 makes them important in film formation kinetics.
Levelling Agent HL988 polyelectrolytes, with the ability to absorb and retain water and swell to many times their original volume.
Levelling Agent HL988s are found in the market as white and fluffy powders.
Levelling Agent HL988s are an indication of molecular weight and the specific components of the polymer.
Levelling Agent HL988 works through a controlled surface migration mechanism, meaning it moves toward the coating-air interface during the molten stage and temporarily lowers surface tension before curing begins.
This allows the coating to self-level into a smooth film.
This makes it important in dynamic coating behavior.
Levelling Agent HL988 is particularly effective in thermosetting powder coatings, where there is a short window between melting and crosslinking, requiring fast and efficient leveling action.
If the timing is not correct, surface defects can become permanent.
This makes it important in curing process control.
Melting point: 95 °C
Boiling point: 116 °C
Density: 1.2 g/mL at 25 °C
Tg: 106
Vapor pressure: 2.64–3.57 hPa at 20–25 °C
Refractive index: n20/D 1.442
Flash point: 100 °C
Storage temperature: 2–8 °C
Solubility: Swellable in water and glycerin and, after neutralization, in ethanol (95%). Carbomers do not dissolve but swell extensively because they are three-dimensionally crosslinked microgels.
Form: Powder
Color: White
pH: 2.5–3.0 (1% aqueous solution)
Viscosity: 250–500 cP (25 °C)
Viscosity: 400–1,200 cP (25 °C)
Viscosity: 500–1,500 cP (25 °C)
Viscosity: 700 cP (4% aqueous solution)
Water solubility: Soluble in water
Dielectric constant: 2.7–4.5 (0 °C)
Cosmetics ingredient functions:
Film forming
Binding
Gel forming
Viscosity controlling
Emulsion stabilising
InChI: 1S/C3H4O2.Na/c1-2-3(4)5;/h2H,1H2,(H,4,5);/q;+1/p-1
InChIKey: WLAMNBDJUVNPJU-UHFFFAOYSA-N
SMILES: OC(=O)C=C
LogP: 0.23–0.27 at 20 °C and pH 3.59–3.63
Levelling Agent HL988 improves optical uniformity of coatings by reducing microscopic surface roughness, which increases light reflection consistency and enhances gloss levels.
This is why it is widely used in high-gloss finishes.
Levelling Agent HL988 makes it important in surface optics of coatings.
Levelling Agent HL988 is compatible with multiple resin systems including epoxy/polyester hybrids, TGIC-polyester, and polyurethane powder coatings, making it versatile across industries.
Levelling Agent HL988 reduces the need for multiple additives in different formulations.
This makes it important in formulation standardization.
Because it is used at very low concentrations, it does not significantly affect hardness, adhesion, or mechanical strength of the final cured coating when properly formulated.
This allows performance improvement without compromising durability.
Levelling Agent HL988 makes it important in balance-of-properties design.
Levelling Agent HL988 leveling agents are often formulated to be compatible with multiple resin chemistries (epoxy, polyester, hybrid systems), allowing manufacturers to use a single additive across different product lines.
This simplifies inventory and formulation complexity.
Levelling Agent HL988 makes them important in industrial formulation standardization.
Some grades also help reduce surface tension gradients caused by contamination, substrate differences, or uneven heating during curing, which otherwise lead to defects like craters or pinholes.
This improves coating robustness under real-world production conditions.
Levelling Agent HL988 makes them important in defect suppression chemistry.
During high-temperature curing or combustion, organic decomposition products such as smoke and irritant vapors may be released, similar to most polymer-based additives.
Proper ventilation in coating ovens is necessary.
Levelling Agent HL988 makes thermal process safety important.
They are chemically stable under normal storage conditions but should be kept dry and protected from contamination to ensure consistent dispersion and performance in coating systems.
Moisture control helps maintain powder quality.
Levelling Agent HL988 makes storage stability important.
Levelling Agent HL988 is generic name for synthetic high molecular weight polymers of acrylic acid.
They may be homopolymers of acrylic acid, crosslinked with an allyl ether pentaerythritol, allyl ether of sucrose or allyl ether of propylene.
In a water solution at neutral pH, PAA is an anionic polymer, i.e. many of the side chains of PAA will lose their protons and acquire a negative charge.
Levelling Agent HL988s are used in form of alkali metal or amonium salts e.g. sodium polyacrylate.
Levelling Agent HL988, and HL505 are industrial coating additives (mainly polyacrylate-based leveling agents with silica carriers) used in powder coatings and resin systems to improve film formation quality and surface smoothness.
They are designed to eliminate surface defects like craters, fish-eyes, and uneven coating flow.
Levelling Agent HL988 makes them important additives in coating formulation chemistry.
Chemically, these products are typically polyacrylate polymers (often poly(butyl acrylate) or related acrylate copolymers) dispersed on a silica carrier to improve handling and dispersion in powder coating systems.
This structure allows controlled migration to the coating surface during curing.
Levelling Agent HL988 makes them important in polymer coating technology.
They work by reducing surface tension and improving wetting of the substrate, which allows the liquid or molten coating to spread evenly before curing into a smooth film.
Levelling Agent HL988 helps prevent defects caused by poor flow or contamination.
Levelling Agent HL988 makes them essential in surface finishing science.
Levelling Agent HL988 are best described as flow and leveling additives used in epoxy, polyester, polyurethane, and hybrid coating systems to improve gloss, smoothness, and defect-free film formation.
Their main function is physical surface control rather than chemical reaction.
Uses:
Levelling Agent HL988 is widely used in powder coatings for household appliances, metal furniture, and decorative metal products where smooth, high-gloss surfaces are required.
It improves appearance and reduces surface defects.
Levelling Agent HL988 makes it essential in decorative coating systems.
Levelling Agent HL988 is used in industrial protective coatings for machinery and equipment where uniform film formation is important for corrosion resistance and durability.
A smooth coating improves long-term protection performance.
This makes it important in industrial protection systems.
Levelling Agent HL988 are used in powder coating formulations for metal furniture, appliances, automotive parts, and industrial equipment where smooth, glossy, defect-free surfaces are required.
They improve appearance and coating uniformity.
Levelling Agent HL988 makes them important in industrial finishing.
They are used in epoxy and polyester coating systems to improve substrate wetting and reduce surface tension, helping coatings spread evenly over complex geometries.
This ensures complete surface coverage.
Levelling Agent HL988 makes them important in protective coatings.
In architectural coatings and protective industrial paints, they help reduce defects like craters and pinholes that weaken coating integrity.
Levelling Agent HL988 improves durability and visual quality.
This makes them important in construction and infrastructure coatings.
They are used in thermosetting resin systems during curing to control flow behavior before crosslinking locks the final structure in place.
This improves final film smoothness.
Levelling Agent HL988 makes them important in curing process control.
In general powder coating manufacturing, they are added as processing aids to improve production consistency and reduce rejects caused by surface imperfections.
This improves manufacturing efficiency.
Levelling Agent HL988 makes them important in industrial production quality control.
Levelling Agent HL988 are widely used in high-gloss powder coatings for appliances, metal furniture, lighting fixtures, and decorative architectural elements where a smooth, mirror-like finish is required.
They improve visual appearance and surface uniformity.
Levelling Agent HL988 makes them essential in decorative coating systems.
They are used in industrial protective coatings for machinery and equipment where surface defects could reduce corrosion resistance or mechanical durability.
A uniform film helps ensure consistent protection.
Levelling Agent HL988 makes them important in protective engineering coatings.
In automotive coating systems (especially powder-coated parts), they help achieve high-quality finishes with reduced orange peel and improved gloss retention.
This improves both aesthetics and durability.
Levelling Agent HL988 makes them important in automotive finishing.
They are used in coil coatings and sheet metal coatings where continuous high-speed processing requires very fast leveling before curing.
This ensures uniform coatings across large surfaces.
Levelling Agent HL988 makes them important in continuous coating lines.
In architectural aluminum profiles and window systems, they help create smooth, defect-free surfaces that improve both appearance and weather resistance performance.
Levelling Agent HL988 is important for long-term outdoor durability.
This makes them important in construction materials finishing.
They are also used in general industrial powder coating formulations as standard processing aids to improve batch consistency, reduce rejects, and stabilize production quality across different equipment setups.
Levelling Agent HL988 improves manufacturing efficiency and reproducibility.
Levelling Agent HL988 makes them important in industrial quality control.
In architectural powder coatings (e.g., aluminum profiles, window frames, panels), it helps achieve visually uniform, defect-free surfaces suitable for outdoor exposure.
This improves both aesthetics and weather resistance.
Levelling Agent HL988 makes it important in construction coatings.
Levelling Agent HL988 is applied in automotive powder-coated components where high-quality surface finish and gloss consistency are required.
It helps reduce visual defects on visible parts.
This makes it important in automotive finishing.
In general industrial powder coating production, HL988 is used as a standard processing aid to improve batch consistency and reduce rejection rates due to surface imperfections.
This increases manufacturing efficiency.
Levelling Agent HL988 makes it important in production quality control.
Safety Profile:
Levelling Agent HL988 is generally considered a low-hazard industrial additive with minimal inherent toxicity in solid form.
It is primarily a functional processing aid rather than a reactive chemical.
Levelling Agent HL988 makes it relatively safe in industrial use.
The main hazard is dust formation during handling, which may cause mild irritation to the eyes, skin, or respiratory tract if inhaled repeatedly or in large amounts.
Proper dust control and PPE are recommended.
Levelling Agent HL988 makes workplace hygiene important.
Levelling Agent HL988 are generally considered low-to-moderate hazard industrial additives with low acute toxicity in solid form.
They are primarily handling materials rather than highly reactive chemicals.
Levelling Agent HL988 makes them relatively safe in controlled industrial use.
The main hazard comes from dust formation during handling, which may cause mild irritation to the eyes, skin, or respiratory tract if inhaled in large amounts.
Proper dust control is important in manufacturing environments.
Levelling Agent HL988 makes workplace hygiene important.
During high-temperature curing or burning, thermal decomposition may release irritating organic fumes typical of polymer materials.
Adequate ventilation in coating ovens is required.
This makes thermal safety important.
Levelling Agent HL988 is chemically stable under normal storage conditions but should be kept dry and protected from contamination to maintain performance consistency.
Moisture can affect dispersion behavior in coatings.
