EP21AR

Two part epoxy adhesive, sealant, coating and encapsulating system featuring superb acid resistance
Key Features
  • Convenient processing
  • Low viscosity, good flow
  • Good physical strength properties
  • Reliable electrical insulator
Typical Properties
Viscosity
Part A: 10,000-15,000 cps, Part B: 4,000-6,000 cps
Cure Schedule
75°F: 24-48 hours; 200°F: 2-3 hours
Hardness
80-90 Shore D
Service Temperature Range
-60°F to +250°F
Coefficient of Thermal Expansion
40-45 in/in X 10⁻⁶/°C
Dielectric Strength
440 volts/mil
EP21AR Two Component Epoxy System
Discuss with a Specialist
(1-2 Business Day Request) Get Technical Data sheet
(Instant Email Delivery) Request Safety Data sheet
(1-2 Business Day Request)
Applications

Bonding

bonding

Sealing

sealing

Coating

Coating

Encapsulation

encapsulation
Certifications

Meets EU Directive 2015/863

Packaging

Cans

Double Barrel Cartridge

Gun Applicator

Pails

Product Description

Master Bond EP21AR is a two component epoxy resin system for high performance bonding, sealing, coating and encapsulating. It has a convenient 100 to 50 mix ratio by weight and is formulated to cure at ambient temperatures or more quickly at elevated temperatures. The optimum cure is overnight at room temperature followed by 2 to 4 hours at 150-200°F. EP21AR is 100% reactive and contains no solvents or diluents. It has very low linear shrinkage upon cure.

The primary purpose of utilizing EP21AR is to obtain exceptional acid resistance. The chart below describes its resistance to a wide range of acids. EP21AR bonds well to several substrates including metals, ceramics, composites, as well as many plastics and rubbers. The service temperature range is from -60°F to +250°F. The color of Part A is clear and Part B is amber clear. It is available in various colors upon request. EP21AR can be used as an adhesive, sealant, coating or potting system. It is particularly useful for coating tanks and vessels that contain acids. EP21AR is a candidate for aerospace, electronic, electrical, chemical processing and OEM where acid resistance is needed.

Product Advantages

  • Convenient 2 to 1 mix ratio by weight
  • Versatile cure schedules
  • Dependable electrical insulator
  • Good flow, easy to apply
  • High bond strength to both similar and dissimilar substrates
  • Available in many colors
Discuss with a Specialist
(1-2 Business Day Request) Get Technical Data sheet
(Instant Email Delivery) Request Safety Data sheet
(1-2 Business Day Request)
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How to order

Verify Your Product Selection

With thousands of custom formulations available, our expert engineers provide personalized consultation to ensure you select the ideal adhesive. We will follow up with a product and packaging recommendation for your specific application.

Get a Quote

Our customer service team will follow up with a detailed quote with packaging and shipping options.

Place Your Order

We'll work with your company to process the order efficiently.

Receive Your Material

Your adhesive will be made to order and shipped to you. Typical lead times are 10-14 business days, with rush options available for urgent orders.

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