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Star Technology BC-21 Balancing Compound, 2 lb Kit, Blue/Yellow

Manufactured by: Star Technology
BC-21 is a two-part epoxy balancing compound for use in weight addition balancing of electric motor armatures, rotors and fans. BC-21 has a smooth, fibrous, putty-like consistency which keeps the compound from migrating during the balancing process. The two-components of the BC-21, parts A and B, are mixed 1:1 by volume or by weight. BC-21 Part A Blue and BC-21 Part B Yellow are easily mixed by hand until the color is a consistent green.

USD $17.14 / LB

Buy more and save

2-31 $17.14 / LB
32+ $15.85 / LB

In Stock

This item may be sold in units of 2.

  • Brand name :  Star Technology
  • Series :  BC-21
  • Item Name :  Balancing Compound
  • UNSPSC :  31201607

The BC-21 may then be placed on the motor armature as indicated by the balancer. Move, add or subtract BC-21 as necessary to obtain final balance. The working life of the mixed BC-21 is about 2 hr depending upon mass and temperature. Overnight, BC-21 cures to a solid polymer which resists moisture and solvents. BC-21 may also be heat cured at 250 deg F (oven or heat gun). BC-21 can be drilled, tapped or sanded. This product may contain fillers that may settle over time. Product may need to be stirred before using.

Design & Construction
Cure Type Moisture Cure 
Form - Part-A Liquid 
Color - Part-A Blue 
Color - Part-B Yellow 
Performance Details
Full Cure Time 12 hr 
Open Time 1.5 - 2.5 hr 
Shear Strength 1000 psi 
Tensile Strength 1500 psi 
Environmental Condition
Temperature Rating -40 to 450 deg F 
Electrical Properties
Dielectric Strength 450V/Mil at 0.125 Inch 
Chemical Properties
Composition - Part-A Epoxy Resin 
Specific Gravity - Part-A 2.5 
Specific Gravity - Part-B 2.5 
Physical Properties
Container Size 2 lb 
Container Type Kit 
Hardness 90 Shore D 
Odor/Scent - Part-A Epoxy 

Star Technology BC-21 Balancing Compound, 2 lb Kit, Blue/Yellow Technical Data Sheet 

Features :

Applications :

  • For Weight Addition Balancing of Electric Motor Armatures, Rotors, and Fans