Chemical Anchor Resin Volume and Cartridge Calculator

How is resin consumption for a chemical anchor found?

In a chemical anchor the resin fills the annular gap between the hole and the rod. Geometrically that volume is V = π / 4 × (hole diameter² − rod diameter²) × depth. It is multiplied by the number of anchors, a waste allowance is added, and the total is divided by the cartridge volume and rounded up.

Two methods

• Annular gap: the rod volume is deducted from the hole volume. It gives a quick lower bound.
• Fill fraction: many installation guides ask for the hole to be filled to a set fraction starting from the bottom. If you know that fraction, that share of the hole volume is used. When the rod is pushed in, the excess comes out at the mouth, which shows the hole is full.

Why is waste high?

With each new mixer nozzle the first few strokes are discarded because the two components are not yet mixed in the right ratio. Some resin also stays in the cartridge. With only a few anchors this loss can be a large part of the total.

Example

For a 14 mm hole, a 12 mm rod and 110 mm depth, the gap volume is 4.49 mL per anchor. Forty anchors need 179.7 mL, or 206.7 mL with 15 percent waste. One 300 mL cartridge is enough, and one cartridge does at most 58 anchors.

Limits

This tool only estimates material quantity. The load the anchor can carry, embedment depth, edge distance and hole cleaning are set by the product's technical document and by engineering design. With threaded rod and ribbed rebar the real consumption is higher than the geometric volume.