Notch shapes

Seal test 
Seal test

This section contains design guidelines and recommendations on notch design (optimum design and negative examples), and recommendations on applying seals to even surfaces with dual-component systems.



Optimum design of notch geometry for application of liquid sealing components

Radii at bottom of notch and at upper edge (minimum dimensions)

The tongue and groove principle

Notch depth and notch width for flush seals Notch depth to notch width ratio between 1:1 and 2:1

Notch depth and notch width for seals over the notch edge


Negative examples of notch design to avoid air pockets

A Avoid corners – Better: RADII
B Avoid recessed notch cross-sections if possible
C Notch widths> 3 mm no problems
< 3 mm problems(special nozzles, production losses)
D Notch depth: not too large for small notch widths
e.g.: W=3 / D=3 (special nozzles, production losses)

Seal application on even surfaces

Ultra-high thixotropic
1. A:B = 1:1 (unfavourable)

High thixotropic
2. A:B = 1.5:1

A:B = 2:1 (ideal)

A:B = 2:1 to 3:1

3. A:B > 4:1

1. Difficult to implement, only possible with ultra-thixotropic material and special application equipment.
2. For markedly 3-dimensional or overhead application up to an angle of 70°.
3. Only just possible with liquid material.