Amivion PAM-650-500 is a low molecular weight polyamide resin epoxy curing agent produced by the condensation of dimer fatty acids with polyethylenepolyamines. With an amine value of approximately 500 mgKOH/g, Amivion PAM-650-500 provides a high density of reactive amine groups per gram of curing agent, enabling efficient cross-linking of bisphenol A and bisphenol F epoxy resins at ambient temperatures.
Polyamide curing agents of this type are valued for their combination of good flexibility in the cured film, excellent adhesion to metal, concrete, and wood substrates, compatibility with a wide range of epoxy resins, and resistance to amine blush under humid cure conditions.
Amivion PAM-650-500 is suited to protective coatings, marine anticorrosion systems, adhesives, and maintenance painting applications where flexibility, adhesion, and processing ease are primary requirements.
Key Features
- Flexibility in Cured Epoxy Films: The fatty acid-derived segments in Amivion PAM-650-500 introduce chain flexibility into the cured epoxy network, producing films with improved elongation at break, impact resistance, and resistance to cracking under mechanical deformation compared to rigid amine-cured systems. This flexibility is particularly advantageous in coatings applied to thermally cycling structures or substrates subject to vibration and mechanical stress.
- Excellent Substrate Adhesion: Amivion PAM-650-500 contributes strong adhesion to a wide variety of substrates including carbon steel, galvanized steel, aluminum, concrete, and wood. Good adhesion is important in both anticorrosion coating systems and structural adhesive applications, and the polyamide chemistry supports adhesion even where complete surface preparation is not achievable.
- Low Blush Tendency: Compared to unmodified aliphatic amine curing agents, Amivion PAM-650-500 shows reduced tendency for amine blush—surface contamination caused by migration of free amine and subsequent reaction with atmospheric carbon dioxide under humid conditions. This results in better inter-coat adhesion and surface appearance in multi-coat epoxy systems applied under field conditions.
- Compatible with Epoxy Resins and Reactive Diluents: Amivion PAM-650-500 is compatible with standard liquid bisphenol A and bisphenol F epoxy resins over a broad mixing range, and tolerates reactive diluents used to reduce system viscosity. This broad compatibility supports formulation of a wide range of solvent-borne, high-solids, and solvent-free two-component epoxy coatings and adhesives.
- Controlled Pot Life: Polyamide curing agents of this type typically provide longer pot life at a given temperature compared to low molecular weight aliphatic amine adducts, giving applicators more working time during mixing, application, and brush or spray operations. The specific pot life of Amivion PAM-650-500 depends on formulation stoichiometry and ambient temperature conditions.
Typical Applications
Amivion PAM-650-500 is used as the curing agent in solvent-borne and high-solids two-component epoxy coatings for anticorrosion protection and maintenance painting. Primary applications include anticorrosion primers and intermediate coats for structural steel, marine vessels, offshore structures, and industrial equipment; maintenance coatings for bridges, pipelines, and storage tanks where flexibility and adhesion to aged or marginally prepared surfaces are required; and epoxy mastic coatings for surface-tolerant maintenance applications. The product’s flexibility and adhesion characteristics make it well suited to demanding anticorrosion coating programs.
Additional applications include flexible structural epoxy adhesives for bonding dissimilar materials subject to differential thermal expansion; protective coatings for concrete and masonry in civil engineering maintenance; wood sealer and primer formulations requiring penetration and adhesion to porous substrates; and general-purpose two-component epoxy putties and repair compounds requiring ambient cure and good chemical resistance. Amivion PAM-650-500 is also evaluated as a component in flexible epoxy floor coatings and waterproofing systems for substrates prone to movement or cracking.
Technical Specifications
- Chemical Type: Low molecular weight polyamide resin (condensate of dimer fatty acid and polyethylenepolyamine)
- CAS No.: 63428-84-2 (polyamide resin)
- Amine Value: approximately 500 mgKOH/g
- Appearance: Light yellow to amber liquid
- Viscosity at 25°C: Low viscosity relative to higher-molecular-weight 650-series grades, consistent with its short-chain, high-amine-value structure
- Recommended Mix Ratio: approximately 100:20-30 with standard bisphenol-A liquid epoxy resin (by weight; lower than the 650-200 grade due to the higher amine value)
- Cure Schedule: 24 hours at room temperature or 3 hours at 60°C
Thermal Stability
- Amivion PAM-650-500 is thermally stable under normal storage and handling conditions.
- Avoid prolonged exposure to temperatures above the recommended storage maximum. Decomposition upon heating may release amine vapors; maintain adequate ventilation during handling and application.
Storage Recommendations
- Recommended maximum storage temperature: below 30°C
- Store in a cool, dry, well-ventilated area away from heat sources and direct sunlight.
- Keep containers tightly sealed to prevent moisture uptake, CO₂ absorption, and skinning.
- Avoid contact with strong acids, strong oxidizing agents, and reactive epoxy resins outside of intended formulation use.
Packaging & Transport
- Standard Packaging: 25 kg pails or 200 kg drums
- Transport Classification: Not classified as a regulated dangerous good under standard road, sea, and air transport modes (consult the SDS for destination-specific classification)
Amivion PAM-650-500: Safety & Handling
Amivion PAM-650-500 should be handled in accordance with applicable safety procedures for polyamide and amine-containing epoxy curing agents. The product may cause skin sensitization and eye irritation; direct contact should be avoided. Personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing should be worn during handling and mixing. Adequate ventilation should be maintained to limit amine vapor exposure during application. Users should review the Safety Data Sheet prior to use and implement the engineering controls and protective measures specified therein.
Safety Data Sheet and destination-compliant labeling information are available upon request. For related products, see also Amivion ALA-80 and Amivion CAA-35/39.
Stoichiometry and Formulation Blending Guidance
Because Amivion PAM-650-500 carries a substantially higher amine value than lower-reactivity 650-series grades, formulators must recalculate stoichiometric dosing rather than substituting it phr-for-phr into an existing formulation built around a lower-amine-value polyamide. Under-dosing leaves unreacted epoxy groups and a soft, under-cured film, while over-dosing leaves excess unreacted amine that can bloom to the surface as a greasy film or contribute to water sensitivity in the cured coating.
In practice, Amivion PAM-650-500 is often blended with a lower-amine-value, higher-molecular-weight polyamide such as Amivion PAM-650-200 to fine-tune the balance between fast, high-crosslink-density cure and film flexibility, pot life, and viscosity. This blending approach lets formulators dial in cure speed and film hardness for a specific application without moving to a different curing agent chemistry altogether, and is a common technique in polyamide-cured coating and adhesive formulation.
Application Notes for High-Reactivity Grades
High-amine-value polyamide curing agents such as Amivion PAM-650-500 generate a faster initial cure and higher early hardness development than their lower-amine counterparts, which shortens the recoat and handling window in multi-coat coating systems and speeds demold or return-to-service time in adhesive and repair compound applications. This faster reactivity comes with a shorter pot life once the two components are mixed, so batch sizes and application windows should be planned accordingly, particularly at higher ambient temperatures where exotherm accelerates further.
Because the cured network forms more quickly and with a higher crosslink density than lower-amine-value grades, coatings formulated with Amivion PAM-650-500 tend to reach chemical and water resistance milestones sooner, which is valuable in fast-turnaround maintenance painting and marine drydock schedules. Formulators should still allow the full recommended cure schedule before exposing the coating to immersion or chemical service, since early-stage hardness does not guarantee full cure-dependent chemical resistance.
The higher amine value of Amivion PAM-650-500 also reflects a shorter-chain, more heavily aminated polyamine input such as triethylenetetramine in the condensation reaction, which increases the density of reactive secondary amine and imidazoline groups relative to the dimer fatty acid backbone.
