To determine how much mold rubber you need, you’ll first need to calculate the cubic volume (formula: length x width x height) of your mold box and models. Once you have those volumes, you’ll subtract the model volumes from the mold box volume. This will be the remaining space in the mold box that needs to be filled.

All VFI’s molding rubbers list specific volumes on each technical data sheet (TDS), so once you find that number, divide your volume by it to convert it into weight (formula: volume / specific volume = total weight (A side + B side)). Always weigh up more product than you might need to account for loss in the container or for any math errors.