Pro tool · Calculator
How many silicone cartridges for my site?
Enter joint length, width and depth to find out the number of Akfix cartridges to plan for. Instant calculation, no registration.
Your joint dimensions
Measure the joint to fill: length, width (opening) and depth.
Quantity to plan
Total volume needed
396 ml
with safety margin +10%
Number of cartridges
2
cartridges of 310 ml
Joint cross-section
36 Millimeters² (width x depth)
Recommended Akfix silicone
Akfix 915N — Neutral silicone WS
Compatible with glazing and aluminium joinery, ISO 11600 25 LM
Need a quote on this quantity?
How to size a silicone joint correctly
Width / depth ratio rule
For a silicone joint to perform over time (elasticity, mechanical hold), the width / depth ratio should ideally be 2:1. A 10 mm wide joint should therefore be 5 mm deep. If the gap is deeper, it is recommended to use a foam backer rod (Polifoam type) to calibrate depth.
Why not deeper?
A joint that is too deep forces the silicone to bond to 3 surfaces (bottom + 2 side walls). During expansion/contraction, it tears instead of stretching. The foam backer rod prevents bonding to the back and lets the bead "breathe" freely between the two walls.
Sanitary joints: typical depth
For bathtub, shower and basin joints, the visible thickness is generally 4 to 6 mm wide x 4 to 6 mm deep. This is the default value of the calculator above.
Exterior aluminium joinery joints
For perimeter joints between aluminium joinery and a wall (concrete, brick), plan 8 to 12 mm wide x 6 to 10 mm deep with a foam backer rod. Use neutral silicone (Akfix 915N) to avoid aluminium corrosion.
