From 98% Imported to 98% Local: How Felcon and Four-C-Tron Are Building India's Semiconductor Cleanroom Ecosystem

For more than three decades, UK-based cleanroom specialist Felcon Limited and Bengaluru-based Four-C-Tron have quietly built some of India's most important semiconductor infrastructure  starting with the country's earliest wafer fab and continuing through today's wave of OSAT facilities and new-generation fabs. In a wide-ranging conversation with EEHerald, Felcon Managing Director Ian Mutton and Four-C-Tron Founder Chandrasekhara discussed how India's cleanroom supply chain has flipped from near-total import dependence to near-total local sourcing, why semiconductor cleanrooms are fundamentally different from pharma cleanrooms, the mistakes first-time fab builders make, and their plans to manufacture cleanroom equipment locally through a new Indian entity.

Felcon has supplied cleanroom and laboratory equipment since 1971, and Mutton has been building cleanrooms in India alongside Chandrasekhara since the late 1980s and early 1990s. Their first Indian project was the cleanroom for Indian Telephone Industries  the country's one of the earliest complete wafer fab  which, remarkably, is still operating three decades later.

"When we first started working together... we had to outsource probably 98% of all the components, whether it be the flooring, the filters, ductwork, everything," Mutton said. "Here we wind forward 33 years later and it's the percentages the other way around. 98% is available in India."

He credited not just the volume of local supply but its quality, saying the perception of Indian manufacturing quality has risen in ways that are "difficult to understand and explain." Beyond materials, he pointed to major advances in the electronics and software layer of cleanroom operation  building management systems, remote monitoring, and "night setback" features that cut air-handling costs when facilities are idle. According to Mutton, the pace of change accelerated sharply in the decade before COVID-19.

 Why Semiconductor Cleanrooms Are Not Pharma Cleanrooms

A central theme of the discussion was the gap between semiconductor-grade cleanrooms and those used in pharmaceutical or medical applications. While both control airborne contamination, Mutton and Chandrasekhara said the engineering disciplines diverge sharply once you get into the details.

Semiconductor manufacturing operates at the sub-micron level, meaning any contamination can destroy a product outright  a far tighter tolerance than most pharma applications, which rely more heavily on isolators and general clean-air control. Chandrasekhara laid out the practical differences:

- Classification standards differ. Semiconductor cleanrooms are commonly built to Class 10, Class 1, or Class 100, while pharma facilities typically operate at 1 lakh or 10 lakh particle-count levels.

- Laminar airflow is essential in semiconductor cleanrooms but far less critical in pharma, which typically uses turbulent airflow as long as the space is broadly clean.

- Cable routing is tightly controlled, with cables often required to be manufactured inside the cleanroom itself  a practice Chandrasekhara said pharma facilities don't consider.

- Pass boxes govern wafer movement between process stages (after diffusion, etching, or lithography), ensuring contamination from one classification zone (say, Class 100) never leaks into a stricter zone (Class 10 or Class 1). Pharma facilities, by contrast, allow much freer movement between rooms.

- Materials selection is stricter, with honeycomb wall panels used in semiconductor cleanrooms to control vibration and noise a consideration largely absent in pharma cleanroom construction.

Chandrasekhara said this specialization gap is where many Indian consultants fall short. "This is where the difference comes," he said, describing how consultants experienced in pharma or solar-industry cleanrooms sometimes take on semiconductor projects without the specific expertise required  leading to facilities plagued by water leakage, inconsistent airflow, and poor particle control years after commissioning. Getting it right, he said, requires simulation-based design and close collaboration between cleanroom builders and wet-bench manufacturers — an interaction he said is often missing in India today.

Mutton added that laminarity of airflow  pushing filtered air from ceiling to floor through a perforated raised floor  is one of the more technical differentiators that keeps particulate disturbance to a minimum in ultra-sensitive semiconductor environments.

 The Cost of Getting It Wrong: Common First-Time Mistakes

Asked about the mistakes first-time fab and OSAT builders make, Mutton pointed to a single root cause: inadequate upfront planning. "The higher grade cleanroom, the more expensive the cleanroom is," he said, noting that some projects specify a Class 10 environment when a Class 1000 or even Class 100,000 cleanroom would suffice,  a decision with major implications for capital cost. Precise definition of requirements at the outset, he said, is the single most important factor in cost-effective cleanroom design.

India's heat, humidity, dust, and monsoon rains present their own design challenges. Mutton said the key is designing the air-conditioning system to handle climate extremes from the outset, working alongside the filtration system to maintain both clean air and stable temperature/humidity. Semiconductor cleanrooms also require significant air extraction   more than most pharma facilities  with exhaust routed through scrubbers before release, ensuring air returned to the surrounding environment is safe for the public.

Chandrasekhara expanded on the safety dimension, noting that process gases and chemicals must be extracted, neutralized, and disposed of according to hazardous-waste standards rather than released into common drains, as is sometimes acceptable in other industries. Equipment selection for this  dry scrubbers, wet scrubbers, containment systems  depends heavily on the specific process being run, whether semiconductor, solar, or another compound-assembly application.

Mutton also flagged the growing importance of health and safety inside the cleanroom itself: PPE, fire detection and suppression systems (critical given the volatile solvents used in some processes), and broader "triple protection"   of the product, the operator, and the surrounding environment — that he said simply wasn't prioritized 10 to 30 years ago.

With scaling now a live issue for many Indian facilities, both men stressed that expansion capacity has to be designed in from day one. Retrofitting a cleanroom later for growth, Mutton said, often amounts to building an entirely new facility. Felcon's approach is to reserve spare space and provision ancillary systems  air conditioning, ductwork  for anticipated future capacity, balancing that against upfront cost.

Chandrasekhara described a modular approach used in past projects: reserving space without fully building it out, then extending utilities and connections later as capacity needs grow. He cited a "chassis concept" cleanroom design  a Class 10,000/1,000 environment adjoining a Class 100 space — that allows maintenance technicians to service sophisticated tools without disrupting the cleanroom's contamination control, entering through one door and exiting through another after servicing. He said this design has kept a facility clean 25 years after installation, contrasting it with less-planned "semi-complex" cleanrooms that have since required revamping.

Workforce readiness emerged as a recurring concern. Chandrasekhara argued that cleanroom protocol training needs to start at the installation stage  ideally with a client's own project engineer embedded with the installation team from the beginning, so operational staff understand the facility "from start to finish" rather than inheriting it cold.

He detailed the basics that are too often overlooked: correct use of ESD-protective garments, headgear, and masks; proper technique at the crossover bench when changing shoes before entry; and correctly rotating inside the air shower to ensure full-body exposure, rather than rushing through. "This is one area which is missing in India," he said, pointing to newly formed bodies like the Contamination Control Society of India  involving figures such as Jaydev Kenchappa  that have begun offering formal training. He suggested that semiconductor education programs in India should include a dedicated chapter on cleanroom maintenance, alongside existing chip design and fabrication curricula.

Mutton struck an optimistic note on this front, observing that India now has close to two generations of cleanroom-experienced professionals, many of whom have also worked overseas and brought back international protocol standards and quality expectations. "India is fantastically positioned to move forwards on a world stage," he said, "in a way it wasn't 10, 15 years ago."

Felcon traces its roots to 1971, though Mutton who joined in 1988 and reformed the company in 1992 alongside three colleagues  has led it for over three decades. Based in southeast England, Felcon describes itself as one of the original clean-air technology companies, historically designing and manufacturing in the UK before shipping equipment to Indian customers.

That model is now shifting. Felcon's stated plan is to build cleanrooms from within India  using local resources, local materials, and local manufacturing  to better serve the Indian market as the country's industrial base matures.

Mutton's own path into the industry was unconventional: he left school at 16 with few formal qualifications and took a job assembling medical products in 1976, only realizing years later that he had, in fact, been working inside a cleanroom. He described himself, borrowing a phrase from an Indian colleague, as "streetwise as opposed to bookwise" — a contrast, he noted, with the highly qualified engineers he now works alongside in India.

Chandrasekhara detailed the technical evolution of wet benches  critical semiconductor process equipment traditionally built from polypropylene. With rising safety standards, fire-retardant material meeting the FM4910 semi-standard has become mandatory, and he said Felcon and Four-C-Tron have specialized expertise in qualifying materials and chemistry to this standard.

The companies have supplied roughly 60 to 70 wet benches in India, manufactured in and imported from the UK, some of which remain in operation after 25 years  including at SITAR and the Indian Institute of Science (IISc), where Felcon designed the entire cleanroom for the institute's Centre for Nano Science and Engineering (CeNSE) lab at a reduced rate given its academic status. The companies also built the cleanroom for the chip-packaging firm now known as IZMO (formerly SI2 Microsystem) in Whitefield.

One example stood out: when IZMO relocated its facility after 15 years, Chandrasekhara inspected the original materials and recommended reusing them. Roughly 80% of the fan filter units, water filters, raised flooring, and wall panels  the panels simply resurfaced  were carried over to the new site and performed as well as new imported material. Mutton visited the facility himself the day before this interview to see the results firsthand. On the strength of that track record, Chandrasekhara said, the customer engaged Felcon directly for the new build without a competitive tender.

Four-C-Tron, which has represented Felcon in India for 30 years, has separately manufactured semi-automatic wet benches for clients including BHEL, BEL, and SSPL. The two companies are now formalizing a new joint entity  Felcon Clean Room Technology India Private Limited registered under GST and as an MSME, with Mutton and Chandrasekhara as directors, aligned with India's "Make in India" push. The new company will manufacture select critical equipment locally, including a semi-manual wet bench recently delivered to a chip-related company referred to as QPAI.

Looking ahead, Mutton pointed to modular cleanrooms  near "flat-pack" systems customers can select by size and shape for on-site installation  and containerized cleanrooms, built inside shipping containers at the factory and delivered by truck to a site needing only hard standing and electrical supply, as key growth areas. Use cases include placement outside hospitals or in remote or military locations.

Chandrasekhara, drawing on his background in the defense sector, said he sees particular promise in containerized medical cleanrooms for disaster and emergency response scenarios, where transporting patients long distances to a hospital isn't practical. He said he shared the concept with Mutton the week before this interview and that the two are actively exploring it. With both large-scale fabs and smaller lab-fab facilities now part of the Indian landscape, the companies say they intend to serve the full spectrum  from modular and containerized units to mid-range and large-scale semiconductor fabs  supported by a new joint office in Bangalore.

 

In a striking postscript, Mutton revealed that Felcon has built what he described as the first isolator on Earth designed to handle a returned Mars rock sample  a project built in advance of any actual sample return. Functioning like a miniature cleanroom with controlled cleanliness, temperature, and humidity, the isolator is designed to serve two purposes: preventing any unknown biological material on the sample from affecting Earth, and preventing terrestrial contamination of the sample before scientific study. Mutton called the current version a "breadboard," or early prototype, and said he was proud that Felcon was first to build one.

 

Mutton closed the conversation with a philosophy he said guides the company: "A company is either going forwards or it's going backwards. It's never standing still." He said that ethos underpins Felcon and Four-C-Tron's renewed push into India  a market he has visited for 30 to 40 years and described himself as deeply fond of — as both companies look to expand their footprint across India's fast-growing semiconductor ecosystem.