ARADUR 891

Aradur 891 is a formulated polyamidoamine liquid epoxy hardener designed for use as a curing agent in two-component ambient-cure epoxy systems for civil engineering and protective coating applications.
Aradur 891 is distinguished within the Aradur polyamidoamine hardener range by its notably low viscosity of 130 to 190 mPa·s at 25°C combined with a high amine value of 520 to 550 mg KOH/g, providing fast and uniform crosslinking at room temperature.
Aradur 891 is benzyl alcohol-free, nonyl phenol-free, phenol-free, and tert-butyl phenol-free, offering a cleaner environmental and regulatory profile compared to conventional polyamidoamine hardeners that rely on reactive diluents.

Manufacturer: Huntsman Advanced Materials (Switzerland) GmbH, Basel, Switzerland
Product Type: Formulated polyamidoamine epoxy hardener
Chemical Type: Formulated polyamidoamine
Brand: Aradur® (registered trademark of Huntsman Corporation)
Applications: CE (Civil Engineering)
BzOH Free: Yes

Synonyms: Aradur 891, Aradur® 891, Huntsman Aradur 891, Formulated Polyamidoamine Hardener 891, Epoxy Curing Agent Aradur 891, Polyamidoamine Hardener Aradur 891

Aradur 891 belongs to the Aradur polyamidoamine curative family, which encompasses reactive polyamides, polyamidoamines, aliphatic amines, cycloaliphatic amines, aromatic amines, anhydrides, and novolacs covering a wide range of thermal, mechanical, and electrical properties.
Aradur 891 is a formulated version of a standard polyamidoamine base, optimized through proprietary formulation technology to deliver low viscosity, faster cure response, benzyl alcohol-free compliance, and improved handling properties compared to non-formulated polyamidoamine hardeners of comparable amine value.

Aradur 891 is used in combination with Araldite liquid epoxy resins, and gel time has been measured using the Tecam method with 250 g at 23°C using Araldite GY 250 as the reference resin.
Aradur 891 is part of the range of products that have been pre-registered and registered under REACH (or are REACH-exempt), and the accompanying Material Safety Data Sheet (MSDS) should be consulted prior to handling.

Aradur 891 is supplied as a 100% active liquid hardener, requiring no solvent dilution for civil engineering applications, and is formulated without the use of benzyl alcohol, which eliminates a known SVHC (Substance of Very High Concern) from the cured coating system.
Aradur 891 cures by reacting with the epoxide groups of the base epoxy resin through primary and secondary amine groups present in the polyamidoamine backbone, forming a three-dimensional crosslinked thermoset polymer network with good mechanical performance and substrate adhesion.

Uses of Aradur 891:
Aradur 891 is used as a curing agent in two-component, ambient-cure epoxy formulations for civil engineering applications including industrial flooring, concrete primers, self-leveling systems, coatings for mineral substrates, and construction adhesives.
Aradur 891 is used in solvent-free epoxy coating and flooring systems where low viscosity is required to achieve high solids content, good substrate wetting, and penetration into porous mineral surfaces such as concrete, mortar, and masonry.

Aradur 891 is used in the formulation of epoxy protective coatings for industrial maintenance, chemical storage tanks, infrastructure protection, and surface treatment of concrete and mineral substrates.
Aradur 891 is used in adhesive formulations for civil engineering applications including chemical anchoring, repair mortar, crack injection systems, and bonding agents for concrete and masonry substrates.

Aradur 891 is used in combination with standard liquid bisphenol A epoxy resins such as Araldite GY 250 and Araldite GY 783, and with reactive diluents such as Araldite DY-T, to achieve application-specific formulation targets for viscosity, pot life, cure rate, and mechanical properties.
Aradur 891 may be used in combination with co-crosslinking accelerators such as Accelerator 2950 when faster development of cured properties or improved reactivity is required.

Benefits or Advantages of Aradur 891:
Aradur 891 offers a very low viscosity of 130 to 190 mPa·s at 25°C, which is significantly lower than conventional polyamidoamine hardeners such as Aradur 450 (700 to 2,000 mPa·s) and Aradur 3282-1 (900 to 1,900 mPa·s), enabling easy mixing, improved wetting of porous substrates, and formulation of low-viscosity solvent-free systems.
Aradur 891 is completely benzyl alcohol-free, eliminating the need for this commonly used reactive diluent that is a Substance of Very High Concern (SVHC) under REACH and is restricted in coatings for certain applications.

Aradur 891 has a relatively high amine value of 520 to 550 mg KOH/g and a H+ active equivalent of 74 to 82 g/Eq, providing good reactivity at ambient temperature and efficient crosslinking with standard bisphenol A epoxy resins at typical mix ratios.
Aradur 891 delivers a gel time of approximately 100 minutes when measured with Araldite GY 250 at 250 g / 23°C, providing an adequate pot life for most civil engineering and industrial coating applications while still allowing practical through-cure times at ambient temperature.

Aradur 891 imparts low color to cured systems with a Gardner color value of ≤10, supporting applications where aesthetic appearance and minimal yellowing of the cured coating are desired.
Aradur 891 is part of a product range that is nonyl phenol-free, phenol-free, tert-butyl phenol-free, and BPA/BPF-free in the curative itself (certain products may contain trace amounts where adducted with BPA or BPF epoxy resins), supporting formulator compliance with environmental and labeling regulations.

Features of Aradur 891:
Aradur 891 is a low-viscosity liquid at ambient temperature, appearing as a clear to slightly yellowish fluid with a characteristic amine odor typical of polyamidoamine hardener systems.
Aradur 891 is a 100% active liquid hardener containing no solvent, making it directly applicable in solvent-free formulations and enabling high-solids or 100% solids epoxy systems for civil engineering applications.

Aradur 891 has been formulated specifically for civil engineering applications, making it particularly suited for concrete protection, flooring, primers, repair systems, and bonding applications.
Aradur 891 is compatible with a range of standard bisphenol A and bisphenol A/F liquid epoxy resins and reactive diluents from the Araldite range, offering formulation versatility for different performance requirements.

Chemical Properties of Aradur 891:
Aradur 891 is a formulated polyamidoamine, a class of epoxy hardeners produced by the condensation of dimerized fatty acids (dimer fatty acids) with polyamines such as ethylenediamine or diethylenetriamine, yielding a polymeric structure containing both amide and amine functional groups.
Aradur 891 cures epoxy resins through nucleophilic addition of the primary and secondary amine hydrogens (N-H) to the epoxide ring, forming hydroxyl-amine adducts and building a crosslinked thermoset network; each active hydrogen (H+) reacts with one epoxide group, and the stoichiometric calculation is based on the H+ active equivalent weight.

Aradur 891 is chemically stable under normal storage and handling conditions and does not react dangerously with epoxy resins until intentionally combined and mixed; however, the curing reaction is exothermic and the heat generated increases with batch size and temperature.
Aradur 891 is incompatible with strong acids, strong oxidizing agents, isocyanates, and other reactive chemicals; contact with these substances should be avoided during handling and storage.

Production of Aradur 891:
Aradur 891 is manufactured by Huntsman Advanced Materials through proprietary formulation of polyamidoamine base materials using Huntsman's synthesis, formulating, and production facilities operated worldwide.
Aradur 891 production involves controlled condensation of dimer fatty acids with polyamine components to produce the polyamidoamine base, followed by formulation adjustments to achieve the target viscosity, amine value, H+ active equivalent, and benzyl alcohol-free composition.

Material Safety Data Sheet (MSDS) of Aradur 891:

Handling of Aradur 891:
Aradur 891 should be handled in accordance with good industrial hygiene and safety practices and in compliance with the Product Safety Data Sheet (PSDS) available from Huntsman Advanced Materials.
Aradur 891 handling requires avoiding contact with eyes, skin, and clothing, and avoiding inhalation of vapors or mist during mixing, spraying, or heating operations, as polyamidoamine hardeners are skin sensitizers and may cause allergic contact dermatitis upon repeated exposure.

SDS of Aradur 891:

Stability and Reactivity of Aradur 891:

Chemical stability:
Aradur 891 is stable under recommended storage and handling conditions when kept in its original sealed container.

Reactivity:
Aradur 891 reacts with epoxy resins when mixed; the curing reaction is exothermic.
Aradur 891 may react with strong acids, strong oxidizing agents, isocyanates, and other reactive chemicals, and should be kept away from these materials.

Conditions to avoid:
Excessive heat.
Open flames and ignition sources.
Direct sunlight.
Freezing temperatures (may affect product quality).
Contact with strong acids, strong oxidizing agents, and incompatible chemicals.
Large unmixed batches at elevated temperatures (exothermic risk).

Incompatible materials:
Strong acids.
Strong oxidizing agents.
Isocyanates.
Reactive chemicals capable of reacting with amines or amides.

Hazardous decomposition products:
Carbon monoxide (CO).
Carbon dioxide (CO2).
Nitrogen oxides.
Ammonia and amine vapors.
Irritating organic fumes.

Handling and Storage of Aradur 891:

Handling:
Handle in accordance with good industrial hygiene and safety practices.
Avoid contact with eyes, skin, and clothing; use appropriate personal protective equipment.
Avoid inhalation of vapors or mist during mixing and application.
Wash hands thoroughly after handling and before eating, drinking, or smoking.
When mixing Aradur 891 with an epoxy resin, control batch size and temperature to manage exothermic heat generation.

Storage:
Store in a dry place in the sealed original container.
Keep Aradur 891 away from direct sunlight and heat sources.
Protect from freezing.
Store away from incompatible materials including strong acids and oxidizing agents.
Consult the Huntsman Product Safety Data Sheet for specific recommended storage temperature range and shelf life information.

First Aid Measures of Aradur 891:

Inhalation:
Move affected person to fresh air.
If vapors or mist cause respiratory irritation, coughing, or discomfort, seek medical advice.

Skin contact:
Remove contaminated clothing.
Wash affected skin thoroughly with soap and plenty of water.
Polyamidoamine hardeners including Aradur 891 are potential skin sensitizers; seek medical advice if redness, itching, rash, or allergic reaction develops or persists.

Eye contact:
Immediately rinse cautiously with clean water for at least 15 minutes while holding eyelids open.
Remove contact lenses if present and easy to do.
Seek immediate medical attention if irritation, redness, pain, or blurred vision persists.

Ingestion:
Rinse mouth with water.
Do not induce vomiting unless instructed by medical personnel.
Seek medical advice if discomfort, nausea, or other symptoms develop.

Firefighting Measures of Aradur 891:

Suitable extinguishing media:
Water spray, foam, dry chemical powder, or carbon dioxide.

Specific hazards:
Aradur 891 is combustible.
Thermal decomposition or combustion may produce carbon monoxide, carbon dioxide, nitrogen oxides, ammonia, amine vapors, and irritating organic fumes.

Protective equipment for firefighters:
Wear self-contained breathing apparatus (SCBA) and full protective clothing.

Firefighting instructions:
Cool exposed containers with water spray.
Prevent contaminated firefighting water from entering drains or waterways.

Accidental Release Measures of Aradur 891:

Personal precautions:
Avoid contact with eyes and skin.
Avoid inhalation of vapors or mist.
Spilled Aradur 891 may create a slipping hazard; use appropriate personal protective equipment.

Environmental precautions:
Prevent Aradur 891 from entering drains, sewers, soil, or waterways.

Methods for cleaning up:
Contain spilled Aradur 891 with inert absorbent material such as sand or vermiculite.
Collect into properly labeled containers for disposal according to local regulations.
Clean the contaminated area after collection.

Exposure Controls / Personal Protective Equipment of Aradur 891:

Engineering controls:
Provide adequate ventilation, particularly in enclosed spaces or when Aradur 891 is applied by spraying or at elevated temperatures.

Eye protection:
Wear safety glasses with side shields or chemical splash goggles.

Hand protection:
Wear chemical-resistant protective gloves; nitrile or neoprene gloves are recommended for protection against polyamidoamine hardeners.

Skin and body protection:
Wear suitable protective clothing to prevent skin contact; polyamidoamine hardeners are potential skin sensitizers and dermal contact should be minimized.

Respiratory protection:
Not normally required under adequately ventilated ambient conditions.
Use a suitable organic vapor and mist respirator if Aradur 891 is sprayed, heated, or used in poorly ventilated spaces.

Hygiene measures:
Wash hands thoroughly after handling Aradur 891 and before eating, drinking, or smoking.
Remove and launder contaminated clothing before reuse.
Do not eat, drink, or smoke in areas where Aradur 891 is handled.

Identifiers of Aradur 891:
Product Name: Aradur 891
Manufacturer: Huntsman Advanced Materials (Switzerland) GmbH
Chemical Type: Formulated polyamidoamine
Brand: Aradur® (Huntsman Corporation)
Application Code: CE (Civil Engineering)
BzOH Free: Yes
Regulatory Status: Pre-registered and registered under REACH (or REACH-exempt); compliant with Huntsman REACH pre-registration

Properties of Aradur 891:
Physical state: Liquid
Appearance: Clear to slightly yellowish oily liquid
Odor: Characteristic amine odor
Viscosity (25°C): 130–190 mPa·s
Amine value: 520–550 mg KOH/g
H+ active equivalent: 74–82 g/Eq
Gel time (Araldite GY 250, 250 g, 23°C): Approximately 100 minutes
Color (Gardner): ≤10
Benzyl alcohol content: Free (BzOH Free)
Nonyl phenol content: Free
Phenol content: Free
tert-Butyl phenol content: Free

Specifications of Aradur 891:
Product name: Aradur 891 (Aradur® 891)
Manufacturer: Huntsman Advanced Materials
Chemical type: Formulated polyamidoamine epoxy curing agent
Viscosity (25°C): 130–190 mPa·s
Amine value: 520–550 mg KOH/g
H+ active equivalent weight: 74–82 g/Eq
Gel time (Araldite GY 250, Tecam, 250 g, 23°C): Approximately 100 minutes
Gardner color: ≤10
Benzyl alcohol: Free
Application: Civil Engineering (CE)
Recommended epoxy resins: Araldite GY 250, Araldite GY 783 and compatible BPA/BPF liquid epoxy resins
Optional accelerator: Accelerator 2950 (co-crosslinking)
REACH status: Pre-registered / registered or exempt
Storage: Dry place, sealed original container; consult PSDS for temperature and shelf life details
Physical form: Liquid, 100% active (solvent-free)

Names of Aradur 891:
Aradur 891
Aradur® 891
Huntsman Aradur 891
Formulated Polyamidoamine Hardener 891
Epoxy Curing Agent Aradur 891
Polyamidoamine Epoxy Hardener 891