ASTI is a Singapore-based cleanroom and M&E contractor specialising in the design, construction and commissioning of semiconductor cleanrooms. We deliver controlled environments from ISO Class 1 to ISO Class 100,000 — engineered, built and validated end to end by a single contractor. ASTI has delivered semiconductor cleanrooms for global wafer-fabrication manufacturers across Singapore and Southeast Asia.
What semiconductor cleanroom construction demands
A semiconductor cleanroom is one of the most demanding controlled environments to build. It requires contamination control to a strict ISO class, precise HVAC and airflow engineering, and tight integration with the process equipment and utilities it serves — all delivered on time-sensitive programmes where delays carry significant cost.
The guiding principle is simple: build a room that is clean from the outset, rather than trying to clean it after construction. Achieving that takes disciplined planning, phased construction and deep experience with the interdependent systems that keep a fab running.
ASTI’s approach: one contractor, end to end
ASTI’s advantage on semiconductor projects is integration. Rather than splitting the cleanroom and its supporting services across separate contractors — each with its own interfaces and finger-pointing risk — ASTI delivers the full scope in-house:
- Cleanroom design and build — controlled environments engineered to the required ISO class, from concept and detailed engineering through to testing, commissioning and validation.
- Mechanical & electrical (M&E) services — HVAC, chilled water, electrical and process-utility systems engineered for cleanroom performance and energy efficiency.
- Supporting sub-fab and hook-up works — the gas, chemical, ultrapure-water and exhaust systems beneath and around the cleanroom that tie production equipment into the facility.
This single-accountability model removes the coordination gaps that typically cause delays on fast-paced fab projects, and is what lets ASTI hold responsibility for the cleanroom from empty shell to qualified handover.
Phasing for contamination control
Meticulous planning and phasing are central to clean delivery. ASTI segregates construction into distinct stages — each with its own protocols and controls — so contamination is minimised as the build progresses and the environment is clean at handover, not cleaned afterward. This disciplined, phased approach is what makes demanding ISO classes achievable on tight semiconductor timelines.
Our semiconductor cleanroom capabilities
- Cleanroom classes: ISO Class 1 to ISO Class 100,000, designed to the requirements of each process step
- Design and build: facility planning, detailed engineering, construction, fit-out, testing, commissioning and validation
- M&E services: HVAC, chilled water, electrical and process-utility systems engineered for cleanroom performance
- Supporting systems: gas and chemical distribution, ultrapure water, exhausts and equipment hook-up
- Full project lifecycle: from concept design to turnkey delivery and ongoing maintenance
- Sectors served: semiconductor, pharmaceutical, biotechnology and aerospace
- Track record: over 25 years delivering critical facilities across Singapore and Southeast Asia
Project references and examples are available on request, under NDA. Contact us to discuss your facility requirements and see relevant work.
Why this matters for facility owners
Semiconductor manufacturers in Singapore and across Southeast Asia are expanding capacity under intense time pressure. Choosing a contractor who can design, build and commission the cleanroom as one integrated scope — with in-house M&E and contamination-control expertise — reduces interface risk, shortens the programme and protects the production schedule. With over 25 years of experience and cleanrooms delivered from ISO Class 1 to ISO Class 100,000, ASTI brings that combined capability to semiconductor projects in the region.
ASTI designs and builds semiconductor cleanrooms across Singapore and Southeast Asia. Contact us to discuss your facility requirements.
Frequently Asked Questions
What is involved in semiconductor cleanroom construction?
Semiconductor cleanroom construction involves designing and building a controlled environment to a strict ISO class, with precise HVAC and airflow, integrated M&E and process utilities, and phased contamination control throughout the build. ASTI delivers all of this end to end, from concept design through to testing, commissioning and validation.
What ISO cleanroom class do semiconductor fabs need?
Semiconductor fabrication typically requires the strictest cleanroom classes, often ISO Class 1 to ISO Class 5 (Class 1 to Class 100), depending on the process step. ASTI designs and builds cleanrooms across the full range, from ISO Class 1 to ISO Class 100,000.
Can one contractor design, build and commission a semiconductor cleanroom?
Yes. ASTI delivers the cleanroom, its M&E services and the supporting sub-fab and hook-up works in-house, under a single contractor. This single-accountability model removes the coordination gaps and interface risks that arise when these scopes are split across separate firms.
How does ASTI control contamination during construction?
ASTI segregates the build into distinct, phased stages, each with its own contamination-control protocols, so the environment is built clean from the outset rather than cleaned afterward. This phased approach is essential on time-sensitive semiconductor projects.
Which sectors does ASTI build cleanrooms for?
ASTI builds cleanrooms and critical facilities for the semiconductor, pharmaceutical, biotechnology and aerospace sectors across Singapore and Southeast Asia.
ASTI in the press
ASTI’s cleanroom expertise has been featured in Cleanroom Technology, where our management team discusses semiconductor cleanroom and sub-fab construction:
