Glass adaptor - gasket with flange, D30, EPDM

The Strofix glass adaptor gasket with flange D30 EPDM is a rubber sealing ring with an integrated tubular flange, designed for use in Strofix D30 glass adaptor assemblies. It sits between the stainless-steel cover or distancer and the glass panel, with the Ø 13 mm flange inserting into the pre-drilled hole in the glass to centre the gasket and seal the hole edge. Manufactured from EPDM (ethylene-propylene-diene) rubber, Ø 28 mm gasket diameter, Ø 8.2 mm internal hole, 2 mm flat thickness with a total height of 5 mm including the flange.

The gasket cushions the contact between the metal adaptor components and the glass, preventing direct metal-to-glass contact that could cause stress cracks or scratches. The flange extends through the glass hole, providing a seal around the hole edge and helping to position the gasket concentrically during assembly. EPDM rubber is weather resistant and water resistant with an operating temperature range of −40 °C to +110 °C and a hardness range of 40–90. Two flanged gaskets are typically required per adaptor point — one on each side of the glass panel. The gasket is sold individually.

Use cases:

• Sealing D30 glass adaptor assemblies on balustrades, partitions, and façades
• Protecting the drilled hole edge in toughened or laminated glass from metal contact
• Replacing worn or compressed flanged gaskets in existing Strofix D30 installations
• Centring the adaptor assembly on the glass hole during installation
• Outdoor installations requiring weather-resistant and UV-stable sealing

FAQ:

What is this gasket used for?

The gasket sits between the stainless-steel adaptor component (cover or distancer) and the glass panel in a Strofix D30 point fixing assembly. The Ø 13 mm flange inserts into the drilled hole in the glass, sealing the hole edge and centring the gasket. It prevents direct metal-to-glass contact, cushions clamping pressure, and provides a weather seal. Two flanged gaskets are typically used per fixing point — one on each side of the glass.

How does the flanged gasket differ from the flat D30 gasket?

The flanged gasket has a Ø 13 mm tubular extension that inserts into the glass hole, giving a total height of 5 mm (2 mm flat body + 3 mm flange). The flat D30 gasket has no flange and is 2 mm thick throughout. The flange provides hole-edge sealing and self-centring during assembly, which the flat gasket does not offer.

What internal hole diameter does it have?

The internal hole is fixed at Ø 8.2 mm on this SKU, sized for M8 screws or studs. There is no selectable hole-size option — unlike the flat D30 EPDM gasket which offers Ø 6.2 mm and Ø 8.2 mm.

What material is it made from?

EPDM (ethylene-propylene-diene) rubber. EPDM is weather resistant, water resistant, and UV stable, with an operating temperature range of −40 °C to +110 °C and a hardness range of 40–90.

Which Strofix glass adaptors is it compatible with?

This gasket is sized for the Strofix D30 glass adaptor range (Ø 30 mm cover, Ø 28 mm gasket body). It is not compatible with D40, D50, or other adaptor sizes.

How often should the gasket be replaced?

EPDM gaskets maintain their sealing properties over many years under normal conditions. Replacement is recommended if the gasket shows visible compression set, cracking, hardening, or no longer provides a seal against water ingress.

About glass adaptor gaskets

A glass adaptor gasket is a rubber or silicone washer that sits between the metal adaptor body and the glass surface, preventing direct steel-to-glass contact. It cushions the clamping force, compensates for minor surface irregularities and protects the glass edge around the drilled hole from chipping or stress cracking under load.

Strofix supplies glass adaptor gaskets in six sizes — D30, D40, 40×40, D50, D60 and D70 — in two materials: EPDM rubber and silicone. Both flat gaskets and gaskets with an integrated flange are available; flanged variants provide additional coverage around the hole perimeter.

The correct gasket depends on the adaptor diameter, the required material and whether a flanged or flat profile is needed for the assembly.