# H B Fuller Company radar · 380 documents · 2021-01-01–2026-11-03 · updated 2026-10-31 Canonical: https://slate.greyb.com/radar/h-b-fuller/innovations ## In one minute ### Silicone potting built to cure in the mass Two-component silicone potting is where the engineering is documented most concretely. The base is hydroxyl-terminated polydimethylsiloxane loaded with a thermally conductive filler; the second component carries the crosslinker, silane coupling agent, catalyst and a deep-cure agent — an alkyl or alkoxy substituted silane hydrolysate with a polymerisation degree of two to ten — that lets a thick poured mass set below the surface rather than only where it meets air [1]. The application named is the photovoltaic junction box, where the potting insulates, seals and conducts heat away from the diode so the junction runs cooler in a high-power module [1]. The later version of the same idea changes the filler rather than the resin. Part of the solid filler is replaced by hollow filler of 0.4–0.6 g/cm³ whose surface carries silicone groups with amino, epoxy, vinyl or C8–C16 alkyl functionality, at a solid-to-hollow ratio of 80–100 to 10–30, aimed at junction boxes, new-energy battery packs and motor potting [2]. Weight and cost are being traded against thermal conductivity in the interface chemistry, not by adding more filler. 1. [CN113881390A](/?paper=CN113881390A&utm_source=radar&utm_medium=dashboard) 2. [CN118006289A](/?paper=CN118006289A&utm_source=radar&utm_medium=dashboard) ### The price came in through the raw-material door In March 2026 the company announced a global minimum 10% increase across all product lines effective 1 April, with significantly higher adjustments for some technologies and regions, and asked customers to send updated demand forecasts to their account representatives. The stated cause was petrochemical constraints and availability, not mix or brand strength; management described more than forty supplier force majeure notices following Middle East conflict disruption. ### A medical platform bought with fixed-cost debt The largest commitment is Advanced Medical Solutions: 285p a share, about £659 million of equity and £715 million of enterprise value, agreed on 25 June and structured as a Court-sanctioned scheme. AMS shareholders approved it on 12 August, so what remains is court sanction and clearance rather than votes. ### Highly filled silicone fails at the filler interface A treatment agent copolymerised from an olefinic glycidyl ether, a vinyl silane and a hydrogen-terminated silicone oil, at roughly equal molar parts, keeps the inorganic thermally conductive filler from separating out of the polymer — a failure that shows up as rising hardness and falling heat dissipation over service life. That is the same problem as the potting work seen from the other side: a filled system is only as good as the coupling between filler and resin. ### The customers it honours show the demand pools, and the fastest-growing one is cyclical When the company gave its first customer innovation awards, it picked Anhui Huasun, GAF and Niine — a Chinese solar manufacturer, a US roofing company and an Indian hygiene producer. Those three are the growth pools in the portfolio, and two of them were under pressure in the same quarter of 2026: engineering adhesives grew 3% organically only once solar was stripped out, and hygiene, health and consumables fell 10% on customer inventory tightening and consumer trading down. ### Two years in which the answer has to be operations Fitch affirmed BB with a stable outlook and put pro forma leverage at about 4.7 times, modestly above its 4.5 times negative sensitivity, expecting deleveraging to follow. The company is therefore entering the integration above the threshold at which its own rating comes under pressure. That is a self-imposed constraint with an external consequence: any shortfall in EBITDA, or any resumption of buybacks, walks it back into the sensitivity. My reading is that the commitment is really to a sequence — close, integrate, deleverage — with acquisitions and repurchases suspended until the ratio is repaired. The dividend is the exception and is being held, at $0.2450 a quarter and 58 consecutive years. ### A silver-loaded paste designed around a 30-second press Shingled photovoltaic cells need an adhesive that is conductive, flexible, fast-curing and workable, and the filing states each as a number. The resin is made by condensing silica gel with KH570 silane in alkaline solution; the paste combines 45–55 parts of it with 35–45 parts reactive diluent, 1–3 parts free-radical initiator and 350–450 parts silver powder, and targets shear strength above 3 MPa, glass transition below −50 °C, resistivity under 1×10⁻³ Ω·cm, and cure in under 30 seconds at 110 °C. A low glass transition and a fast cure pull against each other; the resin and diluent design is what buys both. ### In construction the argument is the contractor's labour problem A June 2026 piece by a company employee on a roofing trade site pitches spray applied canister adhesives at workforce constraints: smaller crews, tighter schedules, less physical strain, consistent results across job-site conditions. One trade placement is not a campaign, but it is the clearest statement of the sales logic in the construction-facing lines, and the logic is productivity of a shrinking crew rather than the bond itself. ## Overview ### A two-year trade with a contractual clock H.B. Fuller is buying a medical device maker with borrowed money while its own shareholders press it to sell part of the industrial business, and both have to land before the end of 2026. The medical purchase cleared its shareholder vote on 12 August with 84.23% of votes cast in favour, and the funding has settled into $850 million of 7.625% notes due 2034 after the bridge was cancelled on 22 October. ## What's new H.B. Fuller borrowed $850 million at 7.625% to buy a wound-care business, and in the same month fought a shareholder who wants it to sell the construction adhesives unit that would pay for the borrowing. ## Research ### Dual cure for the side of a board the lamp misses UV curing is fast but cannot reach under a component, and the answer in the filings is a coating that cures two ways: 60–95 parts of one silicone resin with 5–40 parts of a second, a photoinitiator, an adhesion promoter and a catalyst, applied to circuit boards and power batteries so the exposed area sets under light and the shadowed area finishes by moisture. Complete cure without a second pass is the whole point of the formulation. ### Structural adhesives engineered around gap tolerance The acrylic family is built for fit-up, not just strength. One two-component product places a toughener and an anti-shrinkage agent in both parts, mixes them at 0.8–1.2:1 by volume, and starts cure when acidic groups in one part meet nitrogen, sulfur or transition-metal compounds in the other; the filing describes the result as a controlled gradient polymerisation rather than a bulk runaway, which is what allows large-gap bonding without the shrinkage that normally comes with it. ### The dispensing machine is designed with the chemistry, not after it The application equipment is a substantial body of invention in its own right, and it is specific to the adhesives it handles. A polar-plate gluing machine runs a melting tank with heat-conduction partitions forming slots for the plates and an elastic support that holds the heater against the tank bottom so contact survives thermal cycling. Cylinder sealing sets a process window rather than a material spec: the groove wall is trimmed to a specified roughness, hot melt is heated to 170–210 °C and held at least thirty minutes, injected at a set pressure and flow, and the mating part is pressed in after a 20–60 second wait to squeeze the bead into the gap. ### The fusion bond is argued, not filed Kōfinity is presented as a fusion bonded spacer that forms a molecular bond with the glass and the secondary silicone during manufacture, replacing surface-level mechanical adhesion, applied robotically, and building on a 4SG base the company says has been used across more than 100 million square metres with 99.9% still performing. The underlying system is a butyl-based reactive thermoplastic warm edge with an integrated desiccant, metal-free and chemically bonded to glass and silicone rather than held by a profile, and the brand arrived with the Royal Adhesives acquisition that brought Kömmerling in. ### Recyclability designed into the crosslink The one place the company's own research states a mechanism for recyclability is a paper on liquid crystal elastomers, co-authored with four Chinese universities. The network is crosslinked by boronic ester bonds between a vicinal-diol-bearing liquid crystal oligomer and 1,4-phenylenediboronic acid; mild solvent-assisted hydrolysis cleaves those crosslinks selectively while the thioether backbone stays intact, recovering both building blocks at high yield and reconstituting actuators whose thermal, mechanical and actuation properties closely match the pristine material, demonstrated in sequence as a film, a tube and a smart surface. The transferable idea is that a thermoset becomes recyclable by choosing a crosslink that can be taken apart, not by adding a recycling step. ### The engineering sits in one acquired business Read across the filings, the technical record is lopsided in a way the product narrative is not. Almost every patent that describes how something works is published under the Beijing Tonsan and Fule New Materials names, and the subject matter is electronics, photovoltaics, battery potting, industrial assembly and the machinery around them. The Western-facing launches — the fusion bonded spacer, the roofing and packaging products — are carried by announcements and trade interviews, with little or no filing behind them. Whoever is buying this company's technology and whoever is buying its brands are buying two different things, and only one of them is described in a way that can be inspected. ## Market ### Beauty is sold as regulatory cover What the company publishes about its beauty business is compliance, not chemistry: a checklist for substantiating marketing claims under MoCRA and the EU Cosmetics Regulation, a piece on good manufacturing practice for cosmetics, and a focus group on how younger buyers read ingredient and brand claims which the company itself labels directional rather than statistically representative. ### In packaging the regulation is the sales channel, and European supply is the pitch Packaging is the one line where the company talks to the market constantly and in its own voice, and the subject is almost always the rulebook. Its European trade interviews walk through the Packaging and Packaging Waste Regulation in force since 11 February 2025, paperisation of e-commerce packaging, and the rebranding of its coatings under Coativ as a packaging-sustainability portfolio. ## Strategy ### A year-end deadline before a perimeter Ancora's approaches were rejected twice, at 1.1–1.2 billion and then 1.2–1.4 billion, with the board citing the unit's growth, its role in the wider platform and the upside it credits to Project Quantum Leap. Alongside that refusal the board committed to a market check of less integral segments and product lines, to be completed by the end of 2026, with stranded costs and tax examined and proceeds earmarked for debt. What has been committed is a timetable, not a price or a scope. Earmarking the proceeds before deciding what is for sale is the part I would press on: it turns the market check into a funding exercise with a deadline, which is a weaker negotiating position than the board's language implies. ### A margin target that price has to carry The company's own statement of intent is an adjusted EBITDA margin above 20% with low-teens returns on invested capital, reached through disciplined acquisitions and operational execution, and it points to four UK businesses taken from about 30 million to more than 60 million of EBITDA with margins rising from roughly 13% to above 23% as the template. The third quarter of 2026 shows how the remaining distance is being walked: a 19.9% margin on 7.4% pricing with volume lower. A margin target reached mainly by price is also reversible by price, and the acquired-margin template is a small-business story, not an obvious map for a group this size. ### Footprint taken out ahead of the demand base The closure programme commits to 27 plants by 2030, with a North American warehouse network cut from 55 toward ten and roughly $75 million of annualised pre-tax savings attached. The incoming capacity is regional and concentrated: a 15,000 square metre hub at Ras Al Khaimah serving MENA, a Cairo plant built as a regional supply hub for hygiene and packaging, and Charlotte absorbing the California and Georgia aerospace operations. The commitment is coherent, but it is a bet on fewer, larger plants made while volumes are contracting, and it produces exactly the shared-manufacturing entanglement the board cites against a carve-out. ### The technical effort accumulates in batteries and board electronics The newest filings show the engineering work moving past photovoltaic junction boxes. A 2026 filing covers UV-and-moisture dual-cure silicone coatings for circuit boards and power batteries, designed to cure where the light cannot reach. An earlier potting composition names new-energy battery packs and motor potting alongside junction boxes, trading thermal conductivity against weight through hollow filler. Both sit under the Beijing Tonsan and Fule New Materials names. The Western-facing launch of the period, Kōfinity, is presented as a portfolio built on the existing 4SG spacer system, with a performance claim of 99.9% of more than 100 million square metres still performing. So the commitment divides cleanly: new chemistry and new money in Chinese electronics and energy, and branding of an installed product in the West. Only one of those can be inspected in filings. ### Sustainability obligations that no longer scale with sales The direction changed decisively. The earlier commitment was a 20% cut in greenhouse gas intensity, which growth can dilute. The 2030 set is absolute for the two scopes the company controls, with reductions in water demand and waste intensity and a supplier-data requirement, packaged with the claim that nearly 60% of new product development targets customers' sustainability profile. Committing to absolute cuts while sales shrink and the plant base is reshaped means the obligation concentrates on whichever sites survive the closure programme. The published evidence of that work at site level is thin: one example, solar and recycled water at Rionegro. ### The consumer liability was left with the divested product The TEC Power Grout matter was resolved as an exit rather than a defence: a $75 million settlement fund, with the fairness hearing set for 21 October 2026, and a separate action against National Union Fire Insurance to recover defence and settlement costs. The commitment here is that the product went with the business in December 2024 and the legacy claims stayed with the seller. The unpriced part is how much of the $75 million the insurer ultimately bears, and that is the number a sum-of-the-parts view still lacks. ## Areas - M&A & Portfolio Reshaping · 102 documents - Financial Performance & Shareholder Returns · 86 documents - Product & Technology Innovation · 79 documents - Manufacturing Footprint & Operational Efficiency · 57 documents - Sustainability & Circular Economy · 42 documents - Legal & Regulatory Risk · 14 documents