Glass adaptor - gasket, D30, Silicone

The Strofix glass adaptor gasket D30 silicone is a silicone sealing ring designed for use in Strofix D30 glass adaptor assemblies, placed between the stainless-steel cover or distancer and the glass panel surface. Manufactured from silicone rubber, Ø 28 mm outer diameter, Ø 8.2 mm internal hole, 2 mm thick. The gasket is a flat type without a 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. Silicone offers high flexibility and maintains its elastic properties across a wide temperature range, making it suitable for both indoor and outdoor installations. Two gaskets are typically required per adaptor point — one on each side of the glass panel. The gasket is sold individually.

The Ø 8.2 mm internal hole is sized for M8 screws or studs to pass through. The gasket is sized for D30 glass adaptors (Ø 30 mm cover, Ø 28 mm gasket body).

Use cases:

• Sealing D30 glass adaptor assemblies on balustrades, partitions, and façades
• Replacing worn or compressed gaskets in existing Strofix D30 installations
• Cushioning glass-to-metal contact in point fixing assemblies
• Installations where silicone is preferred over EPDM for its flexibility or chemical resistance
• Stocking spare gaskets for maintenance of D30 glass fixing systems

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. It prevents direct metal-to-glass contact, cushions clamping pressure, and provides a seal. Two gaskets are typically used per fixing point — one on each side of the glass.

How does this silicone gasket differ from the EPDM flat D30 gasket?

The material is different: this gasket is silicone, while the alternative is EPDM rubber. Silicone typically offers greater flexibility and a wider operating temperature range. Dimensionally, both share the same Ø 28 mm outer diameter, Ø 8.2 mm internal hole, and 2 mm thickness — they are physically interchangeable. The choice is based on material preference.

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. The flat EPDM D30 gasket offers a choice between Ø 6.2 mm and Ø 8.2 mm if a different hole size is needed.

What material is it made from?

Silicone rubber. Silicone is flexible, maintains its elastic properties over a wide temperature range, and is resistant to UV degradation and ageing.

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?

Silicone gaskets maintain their sealing properties over many years under normal conditions. Replacement is recommended if the gasket shows visible compression set, tearing, 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.