Why Arkema’s Bostik H785 High Tack is becoming a quiet hero on busy building sites

Reviewed: ad hoc news B2B & Pro desk. Edited and checked on 2026-06-20, 07:21. Details in the imprint.

Bostik H785 High Tack is one of those cartridges you see lying on scaffolding planks and window sills, slightly dusty, but clearly in constant use. The hybrid adhesive promises almost instant grab on heavy materials, without visible screws or anchors. On paper, it wants to replace both classic mounting adhesives and many mechanical fixings.

What Bostik H785 is built for

Bostik positions H785 High Tack as a professional hybrid adhesive for high initial grab, especially on vertical surfaces and overhead joints. The product is typically used for bonding façade cladding, window frames, panels, and other heavy building components where screws would spoil the clean look.

The cartridge feels solid in the hand, the nozzle narrow enough to run a controlled bead along narrow profiles. On site, the promise is clear: press the element once, feel it lock in place, and move on without elaborate temporary supports.

The chemistry behind the strong grab

Technically, Bostik H785 High Tack is based on a modern hybrid polymer system, often marketed as an MS polymer or similar. These systems cure under the influence of ambient moisture and are designed to combine high elasticity with strong adhesion to many substrates, including concrete, brick, metals, and some plastics.

Unlike classic silicone, the cured adhesive is usually paintable and less prone to dirt pick-up. Compared with polyurethane foams, there is no foaming expansion that could push components out of alignment, which on façade lines and joints makes the finish look tidier.

How it behaves in everyday use

Professionals like the quiet confidence of a bead that does not slump. You run a stripe of Bostik H785 High Tack on the back of a façade element, lift it into place, and after a short press it already resists sliding. That makes narrow scaffold decks feel less hectic.

Because the adhesive remains slightly elastic after curing, vibrations and thermal movement are absorbed. Doors and windows feel less hollow when knocked, and call-backs for rattling panels or buzzing trim parts tend to drop, which is worth real money for installers.

Where the limits show up

Despite the name, H785 High Tack is not a miracle solution for every bonding problem. Extremely smooth, non-porous substrates such as some powder-coated metals or certain plastics may still require a primer or mechanical preparation to ensure long-term adhesion.

Also, the curing speed depends strongly on temperature and humidity. On cold, dry days, the skin time and full cure can feel noticeably slower, so heavy elements may still need mechanical support over several hours, even if the initial grab feels convincing.

Position in Arkema’s portfolio

Within Arkema’s Bostik brand, H785 High Tack sits as a pro-focused, high-grab mounting adhesive alongside a wide range of sealants, flooring adhesives, and industrial bonding systems. The product reflects Arkema’s broader strategy to move toward higher-margin, specialty materials and solutions with clear, application-specific benefits for installers and building owners.

For investors, Arkema’s shares (FR0010313833) are listed on Euronext Paris in euros, giving financial markets a direct view on how well specialty products like Bostik H785 High Tack support the company’s profitable growth ambitions.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.