The Friction Pendulum Bearing Market: Manufacturers, Patents, Demand Drivers and What Owners Should Know

Searches for the friction pendulum bearing market come from more than one direction. A supplier or investor wants to size the opportunity. An engineer wants to know who can deliver a double or triple pendulum bearing. A building owner wants to understand the people they are about to buy from. This page is written for all of them, from the owner's side of the table. We advise owners of seismic isolation projects and sell no hardware, so no manufacturer and no bearing family is favored here. For the wider picture across all isolator types, see our overview of the seismic isolation system market.

What the product is, and what the market calls it

A friction pendulum bearing is a sliding isolator. An articulated slider faced with a polymer composite liner rests in a polished concave steel dish. During an earthquake the slider travels across the curve. Friction dissipates energy along the way, and gravity pulls the building back toward center. A single pendulum bearing has one dish. A double pendulum bearing has two facing dishes with the slider between them, which buys more displacement in a smaller footprint. A triple pendulum bearing nests an inner slider assembly between two main dishes so that it behaves differently at different shaking intensities. Our explainer on friction pendulum and sliding isolation systems covers the physics in detail.

The naming matters when you read supplier lists. "Friction Pendulum" is a trademark of the American company that developed the modern product. European manufacturers sell the same class of device as "curved surface sliders", which is the generic term used in EN 15129, the European standard for antiseismic devices. Japanese makers say "spherical sliding bearing". The Chinese national standard GB/T 37358 (2019) says "friction pendulum isolation bearings for buildings". A market report that counts only products carrying the words "friction pendulum" misses most of the European and Japanese supply, and one that counts all curved sliders produces a very different total.

The patent history that shaped the supply side

The idea of a building resting on curved sliding surfaces is old. Jules Touaillon's United States patent of 1870 already shows a structure on balls between opposing concave plates. The modern product dates from 1985, when Victor Zayas founded Earthquake Protection Systems (EPS) in California. His patent for an "earthquake protective column support", US 4,644,714, was filed in December 1985 and granted in February 1987. The concept was validated on the shake table at UC Berkeley's Earthquake Engineering Research Center with a quarter scale six story steel model, and the journal paper by Zayas, Low and Mahin appeared in Earthquake Spectra in 1990.

Google Patents lists the anticipated expiry of that original patent as December 2005, and that date is the hinge of this market. While the patent was in force, the single pendulum bearing was a product one company could sell in the United States. The early landmark installations, including the San Francisco International Airport terminal completed in 2000 on 267 bearings and the Benicia Martinez bridge retrofit finished in 2002, came from that supplier. After expiry, European bearing manufacturers that already made spherical bridge bearings under EN 1337 were free to offer curved surface sliders, and EN 15129, in force since 2010, gave them a CE marking route. Japanese producers developed their own spherical sliding bearings, and China issued a national product standard for friction pendulum bearings in 2019.

The multi stage designs have their own patent story. Fenz and Constantinou characterized the behavior of double concave bearings in 2006 and of the triple pendulum bearing in 2008, in research published through the University at Buffalo. The commercial triple pendulum bearing is covered by a later family of patents assigned to EPS. The broadest of them, US 8,484,911, was filed in May 2006 and granted in July 2013, and Google Patents lists its anticipated expiry as July 2026. Whether any continuation or foreign counterpart remains in force in a given country is a question for a patent attorney. What an owner should take from the chronology is simpler. Single and double pendulum bearings have been open to competition for years. Triple pendulum supply has been narrower, and that is changing as the 2006 priority date recedes.

Who makes friction pendulum bearings, by region

The supply side is a short list of specialized engineering firms, most of which also make other bearing or damper products. The table lists the manufacturers we could verify from their own published material. The order within each region is alphabetical and implies no ranking.

A few notes belong under that table. The United States has one dedicated pendulum bearing producer. Dynamic Isolation Systems in Nevada, which market reports routinely list beside it, makes lead rubber bearings and flat sliders and states no pendulum product. The European makers came to curved sliders from bridge bearings, which is why their catalogs quote EN 1337 for the sliding interface and EN 15129 for the seismic device. And the Fago plant in Çorlu, announced in 2023 with a Chinese partner and a stated capacity of 30,000 units a year, is an elastomeric bearing plant first, so it belongs in the lead rubber bearing section below.

What drives demand

Hospitals are a steady source of demand outside Japan. Türkiye's Ministry of Health has required seismic isolation in large new hospitals in its highest seismic zones since a 2013 circular, updated in 2018, and the city hospital program turned that rule into bearing tonnage. Adana City Hospital sits on 1,512 triple pendulum bearings and Isparta City Hospital on 903 friction pendulum isolators. Başakşehir Çam and Sakura City Hospital in Istanbul sits on 2,068 triple pendulum bearings, which made it the largest base isolated building in the world when it opened in 2020. In the United States the same demand comes from Risk Category IV facilities designed under ASCE 7 Chapter 17, where the owner wants the building working the morning after the earthquake rather than merely standing.

Data centers are a newer but growing source of orders. The 365 Main facility in San Francisco was retrofitted onto friction pendulum isolators in 2000. The NTT data center in Santa Clara, California, a four story building that was under construction in 2019 between the San Andreas and Hayward faults, uses triple pendulum bearings paired with fluid viscous dampers. The commercial logic is plain: an operator sells uptime, and an isolated building is one way to keep selling it after a major event.

Bridges are a steady pendulum market. Caltrans Bridge Design Memo 20.33, issued in January 2025, sets out how to design bridges on isolation bearings, names friction pendulum sliding bearings and lead rubber bearings as the two device types, and requires project specific design criteria that build on the AASHTO Guide Specifications for Seismic Isolation Design. The compact height and high vertical capacity of a sliding dish suit heavy bridge decks, and the Benicia Martinez bridge retrofit in California, completed between 1998 and 2002, used pendulum bearings of unusual size.

Retrofits and airports complete the list. Istanbul Sabiha Gökçen Airport's terminal was placed on roughly 300 triple pendulum bearings in 2009. In Japan the spherical sliding bearing has found a niche in distribution warehouses and condominiums. And behind every segment sits a code. ASCE 7 Chapter 17 in the United States, TBDY 2018 Chapter 14 in Türkiye, EN 15129 in Europe and GB/T 37358 in China all require prototype and production testing, which shapes who can bid as much as any commercial factor. Our guide to the ASCE 7 Chapter 17 design requirements explains the testing clauses.

What the published market reports claim

Several research houses sell a friction pendulum bearings market report. Two examples show how far apart they land. Global Market Insights, in a report dated August 2024, valued the market at USD 1.96 billion in 2023 and projected USD 3.1 billion by 2032 at a compound growth rate above 5 percent, with North America holding more than 33 percent of the total. Credence Research valued the same market at USD 1,178 million in 2024, projected USD 1,949.6 million by 2032 at 6.5 percent a year, and split it as North America 32 percent, Asia Pacific 30 percent and Europe 27 percent.

The two base year figures differ by roughly 40 percent for adjacent years. That gap comes from two different scope definitions, and neither publisher explains its own in enough detail for a reader to reconcile them. One company list includes Bridgestone and Dynamic Isolation Systems, which make elastomeric products, and the other includes bearing and consulting firms with no pendulum isolator line at all. Regional shares that put a third of the world market in North America sit awkwardly beside a Turkish hospital program that ordered thousands of triple pendulum bearings for single buildings. Isolator demand is project based and lumpy. One city hospital or one long bridge moves a national total by itself, which makes a smooth compound growth curve a poor model of how orders arrive.

None of this means the reports are useless. They are reasonable for direction: demand is growing and Asia Pacific and Türkiye carry the volume. They are not reliable for market size or regional share, and the same goes for price. An owner who quotes one in a feasibility study should expect a reviewer to ask where it came from.

Pendulum supply next to lead rubber bearing supply

The comparison matters for one procurement reason. The lead rubber bearing was invented in New Zealand in 1975 and its patents are long gone. It is made by more companies in more countries than any other isolator. In Japan, Europe, China and now Türkiye there are multiple domestic producers, and several of the manufacturers in the table above make both families. Pendulum supply has been narrower for the patent reasons described earlier, and in some countries it still comes down to one or two bidders. That changes the bidding dynamics more than it changes the engineering. Where the design allows either family, inviting bids for both widens the field. Where the design calls for a specific pendulum configuration, the owner should know in advance how many qualified bidders exist for it. There is no universal price ordering between the two families. Unit prices are set at tender and depend on bearing size, displacement capacity, testing scope and order volume. Our comparison of lead rubber and friction pendulum isolators covers the technical side of that choice.

What a building owner should take from the market picture

Start with the number of bids. A short supplier list is a reason to work harder on competition, not a reason to accept a single quotation. Write the specification around performance and the governing test standard rather than one maker's product name, so that curved surface sliders, spherical sliding bearings and pendulum bearings can all answer it. Our article on isolator specifications and testing lists what that document needs to contain.

Then fix the testing scope before price is compared. ASCE 7 Section 17.8 requires prototype tests on two full size specimens of each predominant type and size, and EN 15129 type tests are witnessed by a Notified Body. A bid that excludes those tests, or offers an old certificate for a different bearing size, is not cheaper. Ask which laboratory will run the tests and whether a slot is booked, because large dynamic test rigs are few and their queues are part of your schedule.

Lead times come next. Bearings sit on the critical path, since foundations cannot be closed out without them, and delivery commonly runs several months from order through prototype testing, production and production testing. The contract should carry dated milestones for each step.

Finally, keep the cost frame honest. Isolation adds roughly 10 to 15 percent to the structural shell cost and 5 to 10 percent at total project level, with the bearings as the largest line inside that premium; our cost guide breaks it down. A New Zealand hospital study reported a 5 to 10 percent saving on the isolators when the owner bought them directly rather than through the main contractor. If you want help turning the market picture into a specification and a bid comparison, that is the work of our system selection and BOQ preparation consulting, and our manufacturer selection checklist is the place to begin on your own.