Bond line controller (also referred to as BLC or Spheriglass®) are fine solid glass spheres that are used as an additive in 3M & Loctite adhesives and other resin systems. Bond line glass beads will minimize galvanic corrosion as well as keep the bond concentric. To ensure a proper mechanical bond it is best to use 2 grams BLC with every 3 oz. of adhesive. Make sure you choose the correct size based upon the gap between your two parts. If you are specifying this gap to a machinist, we would typically recommend a bond line (gap) of around 0.008” to 0.013” which would use SKU 1031 and SKU 1030.
