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How to Identify and Replace an Edge Trim

Edge trims, or self-gripping seals, are used to protect the edges on panels, doors and glass. They are manufactured with a metal or plastic reinforced self-gripping spine so hold themselves in place without the need for additional adhesive or mechanical fixings. They are available in a range of different sizes designed to fit different panel thicknesses and sealing gaps.

This guide from Seals Direct discusses the different types of edge trim and provides an explanation of what measurements you need to take before purchasing a suitable replacement.

Step 1: Determine the Type of Edge Trim

There are three types of self-gripping clip on edge trims;

1 – Edge Trims
2 – Edge Trims with Side Seals
3 – Edge Trims with Top Seals

Side seals and top seals are manufactured with a sponge sealing bulb which helps create a watertight seal when compressed. This sponge bulb is located on either the side or top of the edge trim, depending on the angle in which the lid closes against the section.

Range of Edge Trims

Not the product you are looking for? Take a look at our technical guide for identifying and replacing lip seals.

Step 2: Measure the Panel Thickness

Measuring the thickness of an edge

Once you have identified the type of edge trim you require, measure the panel thickness. This is the edge that the profile will clip over.

We recommend using either a digital caliper or Vernier caliper to get a precise measurement of the thickness of this panel. This is to ensure that you purchase a product that is large enough to clip over the panel edge, but is not too loose and may fall off. You will need to take this measurement in millimeters.

For reference, most sheet metal is around 1.6mm thick and Perspex or glass is around 3mm to 6mm thick. However, there is no fixed rule and the thickness of your panel edge will be dependent on your application.

Step 3a: Edge Trim

Edge Trim Drawing

If your existing seal does not have a sponge sealing bulb, you will need to use a standard clip on edge trim.

Use the measurement you took in step 2 to identify the best replacement section. These profiles are sold in a range of different sizes to fit different panel thicknesses from 1.5mm to 16mm thick.

ET1537

To Fit 1.5mm Panel
 Colour: Black
Per Metre

ET57

To Fit 1.5mm to 3mm Panel
  Colour: Black
Per Metre

ET167

To Fit 1.5mm to 3mm Panel
Colour: White
Per Metre

ET5233

To Fit 1.5mm to 3mm Panel
Colour: Grey
Per Metre

ET5234

To Fit 1.5mm to 3mm Panel
Colour: Red
Per Metre

ET5235

To Fit 1.5mm to 3mm Panel
Colour: Blue
Per Metre

ET4109

To Fit 3mm to 5mm Panel
Colour: Black
Per Metre

ET3731

To Fit 1mm to 4mm Panel
Colour: Blue
Per Metre

ET1848

To Fit 4mm to 8mm Panel
Colour: Black
Per Metre

ET3103

To Fit 10mm to 12mm Panel
Colour: Black
Per Metre

ET4080

To Fit 16mm Panel
Colour: Black
Per Metre

View our range of Edge Trims.

Step 3b: Edge Trim with Side Seal

Edge Trim with Side Seal Drawing

Your section may have a sponge rubber bulb located on the side of the edge trim. This is the part that creates the seal when the door or lid is closed. You will need to measure the diameter of this sealing bulb to identify a replacement product that adequately seals your door or enclosure.

Once you know the diameter of the sealing bulb, you can use this measurement along with the panel thickness to purchase a replacement section.

We recommend compressing the sponge sealing bulb by approximately 30%. This will create a good watertight seal and reduce the chance of compression set. You can calculate this by measuring the size of the gap between the two panel edges. If you do not have access to either a digital caliper or Vernier caliper, place a piece of blutac on one edge and close the door. Open the door and measure the squashed blutac. This will give you the size of the gap you need to seal.

ETS3239

To Fit 1mm to 3mm Panel
9.7mm Diameter Sealing Bulb
Per Metre

ETS4105

To Fit 1mm to 2mm Panel
10mm Diameter Sealing Bulb
Per Metre

ETS2481

To Fit 1.5mm to 3mm Panel
11mm Diameter Sealing Bulb
Per Metre

ETS2108

To Fit 3mm to 6mm Panel
13mm Diameter Sealing Bulb
Per Metre

ETS4104

To Fit 1mm to 3mm Panel
15mm Diameter Sealing Bulb
Per Coil

ETS58

To Fit 2mm to 4mm Panel
16.5mm Diameter Sealing Bulb
Per Metre

ETS4056

To Fit 3mm to 5mm Panel
15.5mm Diameter Sealing Bulb
Per Metre

ETS3240

To Fit 2mm to 4mm Panel
18mm Diameter Sealing Bulb
Per Metre

ETS4081

To Fit 9.5mm Panel
17.5mm Diameter Sealing Bulb
Per Metre

ETS1472

To Fit 1.5mm to 3mm Panel
21mm Diameter Sealing Bulb
Per Metre

ETS4103

To Fit 3mm to 4mm Panel
20mm Diameter Sealing Bulb
Per Metre

ETS4123

To Fit 1mm to 3mm Panel
Bulb
Per Metre

ETS2581

To Fit 1.5mm to 3mm Panel
Bulb
Per Metre

ETS4102

To Fit 1mm to 3mm Panel
 Bulb
Per Metre

View of range of Edge Trims with Side Seals.

Step 3c: Edge Trim with Top Seal

Edge Trim with Top Seal Drawing

Your section could have a sponge sealing bulb located on the top of the edge trim. This top seal is the part that creates the seal when the door or lid is closed. You will need to measure the diameter of this sealing bulb to identify a replacement product that adequately seals your door or enclosure.

Once you know the diameter of the sealing bulb, you can use this measurement along with the panel thickness to purchase a replacement section.

We recommend compressing the sponge sealing bulb by approximately 30%. This will create a good watertight seal and reduce the chance of compression set. You can calculate this by measuring the size of the gap between the two panel edges. If you do not have access to either a digital caliper or Vernier caliper, place a piece of blutac on one edge and close the door. Open the door and measure the squashed blutac. This will give you the size of the gap you need to seal.

ETS3237

To Fit 1.6mm Panel
5mm Diameter Bulb
Per Metre

ETS4067

To Fit 1mm to 2mm Panel
9.3mm Diameter Bulb
Per Metre

ETS619

To Fit 1.5mm to 3mm Panel
9mm Diameter Bulb
Per Metre

ETS4108

To Fit 1mm to 3mm Panel
9mm Diameter Bulb
Per Metre

ETS59

To Fit 1.5mm to 3mm Panel
14mm Diameter Bulb
Per Metre

ETS1556

To Fit 1.5mm to 3mm Panel
11mm Diameter Bulb
Per Metre

ETS3730

To Fit 1mm to 4mm Panel
11mm Diameter Bulb
Per Coil

ETS4107

To Fit 1mm to 3mm Panel
15mm Diameter Bulb
Per Metre

ETS4122

To Fit 3mm Panel
15mm Diameter Bulb
Per Metre

ETS3238

To Fit 2mm to 3mm Panel
12.3mm Diameter Bulb
Per Metre

ETS4082

To Fit 12.5mm Panel
16.7mm Diameter Bulb
Per Metre

ETS1668

To Fit 3mm to 5mm Panel
17mm Diameter Bulb
Per Metre

ETS4083

To Fit 16mm Panel
17mm Diameter Bulb
Per Metre

ETS4055

To Fit 2.5mm to 5mm Panel
20mm Diameter Bulb
Per Metre

ETS4106

To Fit 0.5mm to 1.5mm Panel
24mm Diameter Bulb
Per Metre

View our range of Edge Trims with Top Seals.

Replace your Edge Trim with Seals Direct


If you’re looking for edge trims, side seals or top seals the team at Seals Direct can help you find the correct product for your requirements. We are a leading supplier of rubber seals and trims, with an inventory of over 760 stocked products.

Contact our technical team by email at sales@sealsplusdirect.co.uk or via phone on 01425 617722 for help and advice with selecting the best product for your application.

How to Identify and Replace a Herzim Trim / Screw Cover Strip