Polysulfide Resin Market

Just over 27,000 commercial airplanes made up the world fleet in 2024, by the count in Boeing’s 2025 Commercial Market Outlook, and the integral wing tanks and fuselage seams of that fleet are closed with sulfur-based sealants. The polysulfide resin market covers the liquid polysulfide polymers, thiol-terminated and epoxy-terminated, that sealant and coating formulators cure into those seals and into the secondary seal of insulating glass. Douglas Insights sizes it at USD 215.5 million in 2025: 44,620 tonnes of resin at an average USD 4,830 per tonne. Revenue climbs to USD 316.9 million by 2035, a 3.93% annual rate made of 2.7% tonnage growth and a 1.2% price leg. Aerospace demand moved first: PPG said on 8 May 2025 that it would invest USD 380 million in a Shelby, North Carolina plant for aerospace coatings and sealants, with construction from October 2025. The study is part of the specialty chemicals hub and is built on the Douglas Insights research methodology.

Which polysulfide resin application carries the most tonnes, insulating glass or aircraft fuel tanks?

Insulating glass secondary sealants carry 41.3% of polysulfide resin value, USD 89.0 million in 2025, because a two-part polysulfide seal holds gas fill and blocks moisture at the lowest cost per metre of glass edge.

Insulating glass secondary sealants hold the largest slice at USD 89.0 million because every double- and triple-glazed unit needs a structural back seal, and polysulfide resin wins on low moisture vapour transmission. Aerospace sealants earn USD 50.9 million, a 23.6% share, on only about 7,370 tonnes, since fuel-resistant grades sell at the top of the price range. Construction joint sealants take USD 34.9 million, 16.2% of value, in facade, bridge and pavement joints where oil and fuel resistance matter. Epoxy modifiers and coatings account for USD 24.6 million, 11.4%, as flexibilisers in floors, tank linings and anti-corrosion coats. Marine and industrial sealants close the table at USD 16.2 million, 7.5%, from deck caulking to fuel-station forecourts.

Aerospace sealants are the fastest-growing polysulfide resin segment at 5.74% a year, reaching USD 88.9 million by 2035, because new-build aircraft and fleet maintenance both consume fuel-tank sealant. By grade, thiol-terminated polysulfide supplies about 90% of tonnes and epoxy-terminated polysulfide the rest. Segment values for 2035 sum to USD 316.2 million, within 0.24% of the headline.

Why are fuel-tank sealers and glass processors buying more liquid polysulfide polymer?

Four forces add 2.7 points a year to polysulfide resin tonnage: aircraft production adds 1.1 points, EU glazing renovation 0.9, epoxy modification 0.4 and Asian construction joints 0.3, on Douglas Insights attribution.

Aircraft come first, at 1.1 points. Boeing expects 43,600 new commercial deliveries over 2025 to 2044 and an annual fleet growth rate of 3.1%, taking the fleet to 49,640 airplanes by 2044. Each new wing and each heavy check consumes fuel-tank sealant, so polysulfide resin for aerospace tracks both build rates and the size of the flying fleet. Sealant makers are adding capacity ahead of that curve. PPG’s USD 380 million Shelby site, announced on 8 May 2025, covers 198,000 square feet on 62 acres, will employ more than 110 people and is due for completion in the first half of 2027, as the company release states. Douglas Insights counts about 7,370 tonnes of aerospace-grade polysulfide resin in 2025.

Glazing renovation adds 0.9 points. The recast EU Energy Performance of Buildings Directive, Directive (EU) 2024/1275, entered into force on 28 May 2024, with national transposition due in 2026. It requires renovation of the 16% worst-performing non-residential buildings by 2030 and the 26% worst by 2033, while buildings use around 40% of EU energy. Window replacement is the cheapest step in most of those renovations, and each new insulating glass unit carries a polysulfide resin, polyurethane or silicone back seal. A 1.2 by 1.5 metre unit has 5.4 metres of edge, and Douglas Insights assumes about 40 grams of two-part sealant per metre, roughly half of it resin, so one million replacement units consume about 108 tonnes of polysulfide resin. Douglas Insights expects insulating glass resin tonnage to grow 2.1% a year in Europe against 1.4% before the recast.

Epoxy modification supplies 0.4 points. Nouryon’s epoxy-terminated Thioplast EPS grades cure at room temperature with amine hardeners and hold from minus 55 to 120 degrees Celsius, per the product brochure, which suits chemical-resistant floors and marine coatings. Asian construction joints add the last 0.3 points, from bridge decks, airport aprons and water-retaining structures in China and India, where fuel and water resistance outweigh price. Douglas Insights puts that use at about 3,100 tonnes of polysulfide resin in 2025. Together the four drivers make up the 2.7% volume leg of polysulfide resin; the 1.2% price leg comes on top.

Which headwinds shave tonnes off thiol-terminated polysulfide resin in glazing and aircraft?

Three substitutes remove 1.1 points from the polysulfide resin volume leg in the slower case, cutting it from 2.7% to 1.6% a year and holding 2035 value to USD 270.8 million.

Silicone in glazing removes 0.5 points. Structural and gas-filled triple glazing increasingly use silicone back seals, which tolerate ultraviolet exposure on frameless facades, and polyurethane competes on fast cure at automated insulating glass lines. For a polysulfide resin seller, every European line switched to silicone takes roughly 150 to 300 tonnes a year out of demand, on Douglas Insights line-level assumptions.

Polythioether in aircraft removes 0.4 points. PPG prints both polysulfide and polythioether gaskets through its PPG ARE technology, with over 17 sealant formulations approved, and lighter polythioether grades keep winning new fuel-tank specifications. Silane-modified polymers in construction joints take the final 0.2 points, because they cure without isocyanate or manganese dioxide. The Polyurethane Market report tracks the competing chemistry.

How much does a tonne of polysulfide resin cost a sealant formulator in 2025?

Sealant formulators pay a blended USD 4,830 per tonne of polysulfide resin in 2025, rising to about USD 5,442 by 2035 on a 1.2% yearly price leg driven by grade mix.

Douglas Insights puts the realised bands at about USD 4,150 per tonne for insulating glass grades, USD 4,300 for construction joint grades, USD 4,700 for marine and industrial grades, USD 5,600 for epoxy-terminated grades and USD 6,900 for aerospace grades. Aerospace resin costs 66% more than glazing resin per tonne. Low-viscosity, narrow-molecular-weight grades for fuel tanks need tighter process control and qualification lots. Nouryon makes eleven Thioplast G grades between 2,000 and 8,000 Dalton, and its technical brochure lists sulfur at about 37% by weight, so feedstock sulfur and bis(2-chloroethyl) formal costs pass straight into price.

Mix explains the price leg. Aerospace sealants grow 5.74% a year against 3.31% for glazing, so the average tonne of polysulfide resin drifts upward even when list prices stay flat. Chinese grades for glazing sell at the low end of the bands and cap any wider increase.

Who supplies polysulfide resin, from Greiz and Taixing to Toray in Japan?

The top three named polysulfide resin producers, Nouryon, Toray Fine Chemicals and Kazan Synthetic Rubber Plant, hold 70.9% of 2025 value on Douglas Insights estimates, because few plants run the sodium polysulfide route.

Nouryon leads with USD 99.6 million: its Greiz site has produced Thioplast since 1963, as the company notes in its 60-year review, and serves aerospace, glazing and construction. Akzo Nobel, its predecessor, built a 10,000-tonne polysulfide plant at Taixing, China, due in early 2007. Toray Fine Chemicals holds 17.9% as the sole Japanese manufacturer of polysulfide polymer, with service from minus 50 to 150 degrees Celsius. Kazan Synthetic Rubber Plant takes 6.8% from Russian and CIS demand. Chinese independent producers together earn USD 46.1 million on glazing grades.

Formulators set the pull on polysulfide resin. PPG, building a USD 380 million aerospace plant in Shelby, is the largest aerospace sealant buyer in our count. Fenzi Group sells Thiover, which it calls the world’s leading polysulfide insulating glass sealant, in a standard grade meeting EN 1279:2018 and an F/1 grade adding CEKAL certification, per its product page. Kömmerling, part of H.B. Fuller since its acquisition, supplies glass and marine sealants from Pirmasens.

Where is polysulfide resin tonnage growing fastest, from Jiangsu glass lines to Gulf facades?

Asia Pacific leads polysulfide resin with USD 85.6 million in 2025, 39.7% of value, because China builds most of the world’s insulating glass and hosts the Taixing and domestic polysulfide plants.

Middle East and Africa is the fastest polysulfide resin region at 5.26% a year, rising to USD 17.2 million by 2035, because Gulf curtain-wall projects specify insulating glass and the region’s airline maintenance hubs keep expanding. Asia Pacific grows 4.29% and reaches USD 130.3 million, with India adding glazing lines. Europe holds USD 60.1 million and grows 3.34%, lifted by window renovation under the recast directive. North America is worth USD 48.3 million and grows 3.71%, the region with the heaviest aerospace weighting, about 38% of its tonnes on our count. Latin America is the wildcard at USD 11.2 million and 3.87%: one Brazilian or Mexican glass processor moving from silicone to polysulfide shifts the regional figure by several points.

Can polythioether displace polysulfide resin in aircraft fuel-tank sealing by the 2030s?

Douglas Insights expects polysulfide resin to keep about 58% of aerospace sealant tonnage in 2035, down from roughly 66% in 2025, because qualified fuel-tank specifications change only with new aircraft programmes.

Polythioether is lighter and more stable at high temperature, but its use spreads programme by programme. PPG’s printed gaskets cover both chemistries and are tested to the AMS 3277 fuel-resistance standard, which shows formulators keep both resins in play. A single-aisle airframe certified with a polysulfide sealant schedule keeps that schedule through production and maintenance, often for 25 years or more. With 33,285 single-aisle deliveries in the Boeing outlook to 2044, the installed base of polysulfide resin specifications outlives any new chemistry. The Aircraft Fuel Management System Market report covers the tank hardware those seals protect.

Why do floor and tank-lining formulators blend epoxy-terminated polysulfide resin into epoxies?

Epoxy-terminated polysulfide resin adds flexibility and chemical resistance to epoxies, and Douglas Insights counts about 4,390 tonnes used this way in 2025, 9.8% of world polysulfide tonnage.

Nouryon lists three Thioplast EPS grades: EPS35, aliphatic, at 3 to 4 Pa·s, and EPS70 and EPS80, at 5 to 10 Pa·s, with EPS80 sold only in the United States. The disulfide bond gives a self-healing effect through bond exchange, and the cured film resists acids and solvents better than a standard epoxy. Toray sells FLEP, an epoxy resin with polysulfide structures, for similar duty. Douglas Insights values the segment at USD 24.6 million and expects 4.42% growth a year, ahead of glazing.

Which REACH rules and EN 1279 standards bind polysulfide resin sealants?

Two rule sets bind polysulfide resin: REACH authorisation for dichromate curing agents since 21 September 2017, and the EN 1279:2018 tests for European insulating glass.

Commission Regulation (EU) No 348/2013 of 17 April 2013 placed sodium dichromate, potassium dichromate and chromium trioxide on REACH Annex XIV, with a sunset date of 21 September 2017. Some aerospace polysulfide sealants used dichromate accelerators, so formulators moved those products to manganese dioxide cures or applied for authorisation. In aerospace, SAE AMS 3277 sets fuel-resistance requirements that qualified sealants must meet. For glazing, EN 1279:2018 tests gas leakage and moisture penetration of the finished unit, so a polysulfide resin supplier sells into a qualified system rather than a loose commodity. Toughened units for facades are covered in the Toughened Glass Market report.

What if aircraft build rates stall, and what is polysulfide resin worth in 2035?

In the base case polysulfide resin reaches USD 316.9 million in 2035, on 2.7% tonnage growth and a 1.2% price leg, with volume reaching about 58,240 tonnes.

The slower case assumes aircraft output stays below plan and silicone takes more glazing lines; polysulfide resin then stops at USD 270.8 million, USD 46.1 million below base. The faster case assumes PPG’s Shelby plant, announced on 8 May 2025, runs full from 2027 and EU renovation beats its 2030 milestone, lifting value to USD 370.3 million. Volume sets the outcome. A one-point lift in yearly tonnage growth adds USD 32.2 million to the 2035 total. Published forecasts for the resin run from 3.8% to 8.71% a year; our 3.93% sits near the low end, because we count resin tonnes rather than finished sealant.

Douglas Exclusive: the polysulfide substitution scorecard

The scorecard is a Douglas Insights model that rates polysulfide resin against four rival sealant chemistries in six end uses, built from 210 scored cells and 64 data points. Cells cover 5 chemistries, 6 end uses and 7 criteria, drawn from producer brochures, specifications and standards.

Criteria are fuel resistance, moisture vapour transmission, gas retention, ultraviolet tolerance, cure speed, qualification depth and cost per metre of joint. Each cell is scored from 0 to 100 and weighted by end use. The rival chemistries are polythioether, silicone, polyurethane and silane-modified polymer.

The finding: polysulfide resin wins five of the six end uses, but only by 4 to 5 points in its two biggest, fuel tanks and glazing. Facade joints are the only use where it already trails. Our count puts 4,570 tonnes, about 10.2% of 2025 polysulfide resin tonnage, at risk by 2035, and 2,180 of them sit in insulating glass. Fuel-resistant pavement and epoxy uses, with leads of 15 to 18 points, are the safe ground.

How the model turns 44,620 tonnes of liquid polysulfide polymer into USD 215.5 million?

Our model multiplies 44,620 tonnes by USD 4,830 per tonne to reach USD 215,514,600, rounded to USD 215.5 million for 2025.

Coverage spans 5 regions, 24 countries, 5 applications, 2 grade families and 4 producer groups. The model uses 187 data points: plant histories, aircraft fleet and delivery counts, glazing output, price bands by grade and 5 published growth rates. It starts from a trade-press count of about 28,000 tonnes of world polysulfide demand in 2004, which our model grows at 2.24% a year to 2025.

Three cross-checks follow. Segment values divided by segment price bands give 44,765 tonnes, 0.32% above the 44,620-tonne build. Backcasting the 3.93% rate gives USD 184.7 million for 2021, 17.5% above a published 2021 resin estimate of USD 157.2 million, a gap we attribute to grade mix. Segment values for 2035 land within 0.24% of the USD 316.9 million headline, and 1.027 times 1.012 minus 1 equals the 3.93% revenue rate.

Sources

1. PPG PPG to invest USD 380 million in Shelby, N.C. aerospace coatings and sealants facility (2025)
2. Boeing Commercial Market Outlook 2025 to 2044 (2025)
3. Nouryon Thioplast: 60 years of polysulfide production in Greiz (2023)
4. Nouryon Thioplast G liquid polysulfide polymers brochure (2023)
5. Nouryon Thioplast EPS epoxy-terminated polysulfides brochure (2023)
6. Toray Fine Chemicals Polysulfide polymers THIOKOL LP (2025)
7. European Commission Energy Performance of Buildings Directive (2024)
8. EUR-Lex Commission Regulation (EU) No 348/2013 amending REACH Annex XIV (2013)
9. Fenzi Group Thiover polysulfide insulating glass sealant (2025)
10. PPG PPG ARE 3D printed sealants (2025)