AL428FDA Two-Part Epoxy Resin

AL428FDA is a two-part, heat-resistant and low exothermic epoxy adhesive formulation. It is a solid epoxy adhesive, with superior chemical resistance and shear strength.

AL428FDA contains a thixotropic agent, which impedes thinning out of the material during heat cure when properly mixed and cured. Its advantages include:

  • Develops a strong bond
  • Durable to numerous construction materials such as metals, glass, rubber, ceramics, concrete and phenolic plastics
  • Provides premium resistance to water, salt solutions, galvanic action, acids, alkalies and most chemicals

Food and Drug Administration (FDA) information

Title 21 of the Code of Federal Regulations (CFR) permits and regulates the use of epoxy resins such as AL428FDA Part A as an indirect food additive in food contact applications. Some of the sections of 21 CFR that support this are 175.105, 175.300, 175.320, and 176.17.

AL428FDA Part B complies with FDA regulations listed in the Title 21 of the CFR, sections 175.105 (c)(5) Adhesives, 175.300 (b)(3)(viii)(c) Coatings adjunct for epoxy resin, 176.170 (b)(1) Components of paper and paper-board in contact with aqueous and fatty foods, and 175.300 (b)(xxxii) Side seam cements.

AL428FDA Part B will comply with the above regulations as long as it is used only with other approved materials and as long as the finished product conforms with extractives limitations for the use-situation as specified in those regulations.

Specifications

Base: epoxy
Solvent: None
Flammability: non-flammable
Color: Amber
Solids contents: 100%
Weight/gal: (Mixed 1:1) 9.0lbs
Coverage: 250ft2/gal to 350ft2/gal
Shelf life: Two years if the packaging remains closed
Service temperature: -40°C to 163°C
Hardness: SD 78
Tensile shear strength (Al to Al): 2700psi
Passes: 10 day humidity test mil STD 8:0 above 95% with condensation
Curing times for various temperatures are 20min at 177°C, 30min at 121°C, 80min at 93°C, 4-6 hours at 66°C

Working time

AL428FDA’s pot life and exotherm are dependent upon several factors, including mass of resin, amount of catalyst used, ambient temperature, and type of equipment used.

A 200g mix of 40% catalyst and 60% resin will have a pot life of approximately 30min at room temperature. A 1:1 mix ratio of catalyst and resin will have 40min pot life at room temperature.

Application

  1. Clean and throughly dry all surfaces to be bonded
  2. Follow mixing-dispensing instructions as shown on package
  3. Apply a thin coat of the mix (not more than 0.010 inches) by brush, spray, or roller to the surfaces to be bonded
  4. Genlty press surfaces firmly together

Packaging information

AL428FDA is available in 50g, divided plastic bags, and in large unit (two-container) pint, quart, and gallon kits.

Each kit consists of the correct amount of the specified epoxy material and curing agent hardener formulations, each supplied in separate containers with complete proportioning, use and cure instructions.

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