What are Component A and Component B in two-part resin systems?

There are no fixed, universal chemical names for Component A and Component B in two-component resins. The terms are industry conventions that vary by resin system:

• Component A: Typically the base resin

• Component B: Typically the curing agent / crosslinking agent

Below are the specific components of the most common two-part resin systems for your reference:

1. Epoxy Resin (widely used in potting, bonding, flooring)

• Component A: Epoxy resin (e.g., bisphenol A epoxy)

• Component B: Epoxy curing agent (amine, anhydride, polyamide, etc.)

2. Polyurethane Resin (PU, elastomers, adhesives, coatings)

• Component A: Polyol component

• Component B: Isocyanate component (NCO)

3. Acrylic Resin (UV / two-part acrylic, structural adhesives)

• Component A: Acrylate monomer / prepolymer

• Component B: Initiator / accelerator (e.g., peroxide, amine accelerator)

4. Silicone Rubber (two-component room-temperature vulcanized silicone RTV-2)

• Component A: Base silicone (containing hydroxyl / vinyl groups)

• Component B: Crosslinking agent + catalyst

In short: A = base resin, B = curing agent / crosslinking agent. The exact composition depends on the resin system.