Description
LTX 90 mm Polystyrene Fixing Plug — 200 pcs per Box
Product Overview
When a domestic EWI project specifies 50 mm insulation boards on standard masonry, the Klimas LTX 90 mm fixing plug is the mechanical anchor that holds those boards securely in place with virtually zero thermal bridging. Part of the insulation fixing accessories range, this hammer-driven plug pairs a polyethylene body with a glass-fibre-reinforced polyamide pin, achieving a point thermal transmittance (χ) of just 0.001 W/K at surface level and 0.000 W/K when immersed. The 90 mm overall length provides a 30 mm anchorage depth into concrete, solid brick, or hollow masonry (50 mm into aerated concrete), making it the go-to length for 50 mm EPS and XPS boards on new-build substrates. Each box of 200 plugs covers approximately 25–33 m² at 6–8 fixings per m², and the full LTX-10 range carries European Technical Assessment ETA-16/0509 under ETAG 014.
Key Benefits
- Matched to 50 mm Boards: The 90 mm length is purpose-engineered for the most common domestic insulation thickness on new-build substrates, ensuring the expansion zone sits fully within the structural substrate without excess length adding unnecessary cost or drill time.
- Thermal Bridge Eliminated: All-plastic construction delivers a point thermal transmittance of 0.001 W/K at surface mount and 0.000 W/K immersed — no metal path interrupts the insulation envelope at any fixing location.
- Certified Across Five Substrates: ETA-16/0509 confirms pull-out performance in substrate categories A through E — concrete, solid brick, calcium silicate, perforated brick, lightweight aggregate, and aerated concrete — so one product covers the vast majority of UK wall types.
- Glass-Fibre Reinforced Pin: The polyamide pin resists bending and snapping during hammer installation, delivering consistent drive-in performance across hard and soft substrates alike.
- 60 mm Flange with Basecoat Grip: The oversized pressure plate features adhesive pockets that increase mortar adhesion directly over the fixing point, supporting a smooth rendered finish free from plug-pattern ghosting — the shadow lines that can appear through thin render coats when fixings are not properly recessed or covered.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Code | LTX-10090 |
| Plug Diameter (dk) | 10 mm |
| Overall Length (Lk) | 90 mm |
| Flange Diameter (Dk) | 60 mm |
| Anchorage Depth (heff) | 30 mm (50 mm for aerated concrete) |
| Drill Hole Depth (h0) | 40 mm (60 mm for aerated concrete) |
| Body Material | Polyethylene (PE) |
| Pin Material | Polyamide + Glass Fibre (PA+GF) |
| Washer Stiffness | 0.50 kN/mm |
| Thermal Transmittance (χ) — Surface Mount | 0.001 W/K |
| Thermal Transmittance (χ) — Immersed Mount | 0.000 W/K |
| Characteristic Pull-Out (Concrete C20/25) | 0.75 kN |
| Certification | ETA-16/0509 (ETAG 014) |
| Pack Quantity | 200 pcs |
Application and Compatibility
The LTX 90 mm plug provides supplementary mechanical fixing for insulation boards bonded with adhesive mortar in ETICS systems. On new-build substrates with a standard 10 mm adhesive layer, this length accommodates insulation boards up to 50 mm thick with surface mounting, rising to 70 mm when using an EPS hole cutter for immersed installation. On retrofit walls where an additional 20 mm of existing plaster sits beneath the adhesive, the effective insulation thickness is 30 mm without a cutter or 50 mm with one.
- Primary Application — 50 mm Domestic Insulation: The 90 mm length pairs directly with 50 mm graphite EPS boards, which represent the most widely specified starting thickness for domestic external wall insulation across the UK. This combination provides a cost-effective route to improving a property's thermal performance.
- Substrate Range: Certified for concrete (C12/15 and above), solid clay and calcium silicate brick, perforated brick including Porotherm, lightweight aggregate block, and autoclaved aerated concrete — effectively covering every masonry substrate type encountered in UK housing from Victorian solid brick through to modern blockwork.
- Immersed Mounting Option: Recessing the plug below the board surface with a hole cutter and capping with grey EPS finishing caps eliminates visible fixing marks and reduces the thermal transmittance at each fixing point to 0.000 W/K — the optimal approach for projects targeting the lowest possible U-values.
Installation Notes
For the best anchorage, drill a 10 mm hole to at least 40 mm depth (60 mm for aerated concrete) using impact mode on concrete and solid brick, or rotation-only mode on hollow and aerated substrates to protect internal web structures. Clear drilling dust with three to four back-and-forth motions at reduced speed, then push the plug body in until the flange sits flush with the insulation board surface. Drive the glass-fibre-reinforced pin with firm, even hammer blows until the head seals against the sleeve — this prevents moisture tracking into the fixing channel. The step-by-step insulation fixings guide walks through the complete process from substrate assessment through to final quality checks.
For projects where thermal performance is the primary target, the immersed installation method is worth the extra step: use a countersinking cutter to recess each fixing point, install the plug at depth, and cap with a polystyrene disc before applying the basecoat layer. This method achieves 0.000 W/K per fixing — the insulation layer performs as though no mechanical fixings are present at all.
Trade Insight — Installer's Note
The 90 mm LTX is the plug I reach for most often on standard domestic refurbishment jobs, because 50 mm graphite EPS is the thickness most homeowners and housing associations start with. It sits right in the middle of the range, which means I can step down to the 70 mm variant for reveal trims or up to the 110 mm for 80 mm board zones without changing manufacturer or drill bit. For working out the correct number of fixings per square metre and positioning them in the right pattern for each wind zone, the fixing pattern and spacing calculator gives the layout that aligns with the ETA recommendations. One detail to get right every time: keep the drill perpendicular to the wall face — an angled hole shifts the expansion zone partially outside the substrate and reduces the effective pull-out resistance.
Is This Product Right for Your Project?
- Choose the LTX 90 mm plug if you are mechanically fixing 50 mm EPS or XPS insulation boards to masonry or concrete substrates in a domestic or low-rise ETICS installation — this is the length specifically matched to that board thickness on new-build walls.
- Need a shorter or longer fixing? For thin reveal boards (10–30 mm), the LTX 70 mm plug saves material cost on narrow details. For 80 mm main-wall boards, the LTX 110 mm plug provides the additional embedment depth required.
- Choose this range if your insulation material is EPS or XPS and the project benefits from all-plastic fixings that eliminate point thermal bridges entirely.
- Specifying mineral wool on a fire-rated facade? Mineral wool's higher density and fire-strategy requirements typically call for metal-pin fixings with greater pull-out resistance; the complete fixing accessories range includes suitable heavy-duty options.
Frequently Asked Questions
How many LTX 90 mm plugs do I need per square metre?
For standard EPS insulation up to 15 metres above ground, the recommendation under ETAG 014 is 6 fixings per m² in central wall areas and 8 per m² in corner and edge zones where wind suction is greater. Above 15 metres, these increase to 8 and 10 per m² respectively. At 200 plugs per box, a single box provides enough fixings for approximately 25–33 m² of central wall coverage, depending on the project's fixing-pattern design.
Can the 90 mm plug handle thicker boards if I use immersed mounting?
Yes — with an EPS hole cutter creating a recess in the board surface before drilling, the effective insulation thickness the 90 mm plug accommodates rises from 50 mm to 70 mm on new-build substrates and from 30 mm to 50 mm on retrofit walls with existing plaster. Immersed mounting also improves thermal performance to 0.000 W/K per fixing point, so the technique delivers both a thickness increase and a performance gain.
What pull-out resistance does the plastic pin achieve?
The all-plastic design delivers characteristic pull-out values of 0.75 kN in concrete C20/25 and solid brick, and 0.50 kN in concrete C12/15. These figures comfortably exceed the design requirements for standard domestic EPS installations under typical UK wind-load conditions. The plastic pin is an intentional engineering choice — it trades the marginally higher pull-out of metal pins for complete elimination of thermal bridging at every fixing point.
Are LTX plugs recyclable at end of life?
Both the polyethylene body and the polyamide pin are recyclable thermoplastics that can enter standard plastics recycling streams. The cardboard box packaging is recyclable through normal paper and card collection, making the product straightforward to manage within projects that track waste and sustainability metrics.
Technical Documentation