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Case Study: Murata Electronics Cleanroom Facility — Steel Platforms & Cross-Line Ladders — Indonesia

Project: Semiconductor Component Manufacturing Facility — Cleanroom Access Systems
Client: Murata Manufacturing Co., Ltd. (PT Murata Indonesia)
Location: Batamindo Industrial Park, Batam, Indonesia
Year: 2022
Products: 52 Steel Equipment Platforms + 18 Cross-Line Access Ladders (FL-SS304-STD)

Project Background

Murata Manufacturing, one of the world’s largest electronic component manufacturers, expanded its multilayer ceramic capacitor (MLCC) production facility in Batam, Indonesia, in 2022. The cleanroom manufacturing environment — ISO Class 7 (Class 10,000) — required equipment access platforms and cross-line ladders that would not introduce particle contamination, resist the facility’s aggressive cleaning chemicals, and maintain structural integrity in a humidity-controlled but chemically active environment.

Dengtai was selected after a rigorous supplier qualification process that included material certification verification, surface finish testing for particle shedding, and a factory audit of welding and finishing procedures. The project required SS304 throughout — carbon steel was prohibited in the cleanroom due to corrosion particles that could contaminate MLCC production.

The Challenge

Challenge	Detail
Particle contamination control	ISO Class 7 cleanroom requirements meant all surfaces had to be non-shedding. Welds had to be ground smooth with no spatter, crevices, or rough surfaces that could trap or release particles. Standard industrial SS304 finishing was insufficient.
Chemical cleaning resistance	The facility used isopropyl alcohol (IPA), hydrogen peroxide vapor, and quaternary ammonium compounds for cleanroom sanitation. SS304 passivation had to withstand repeated exposure to these agents without surface degradation.
Anti-static requirements	Electronic component manufacturing requires static dissipation. All platforms required electrical continuity to the building grounding system, with resistance measurements <=1×10^6 ohms between any two points.
Rapid facility expansion timeline	Murata’s Batam expansion was on an aggressive schedule — the access systems had to be designed, manufactured, and delivered within 10 weeks to align with the tool installation window.
Indonesian SNI compliance	Products required compliance with Standar Nasional Indonesia (SNI) for workplace safety equipment, in addition to the international standards referenced in Murata’s global specification.

The Solution

Dengtai supplied 52 equipment access platforms and 18 cross-line ladders in SS304:

Specification	Detail
Model	FL-SS304-STD (Fixed Ladder, SS304) + Custom-Size Platforms
Material	SS304 (EN 1.4301)
Surface Finish	320-grit polished + electropolishing for cleanroom compatibility
Cleanroom Rating	Compatible with ISO Class 7 (Class 10,000)
Width	600mm (ladders); 800-1,200mm (platforms)
Load Rating	350 lbs (159 kg) ladders; 3.0 kN/m2 platforms
Compliance	ISO 14644-1 (Cleanroom), EN ISO 14122-4, SNI
Grounding	Full electrical continuity; <=1×10^6 ohms between any two metal points
Connections	All-bolted construction (no field welding permitted in cleanroom)

Engineering Adjustments

Electropolishing for cleanroom compatibility — Standard SS304 industrial ladders are supplied with 240-grit brushed finish. For cleanroom use, Dengtai added electropolishing after fabrication, which removes surface iron contamination, smooths micro-crevices, and enhances the passive chromium oxide layer. This process reduces particle adhesion and improves chemical resistance.
All-bolted connections — Welding generates particles and fumes, making field welding impermissible in an active cleanroom. All platform-to-ladder, platform-to-platform, and bracket-to-structure connections were designed as bolted joints with SS316 fasteners.
Grounding continuity design — Each platform section and ladder was designed with integrated grounding lugs at both ends. Dengtai provided a grounding continuity test certificate with the shipment, confirming <=1×10^6 ohms between any two points on each assembly.

Quality Assurance

QC Step	Method
Raw material	Mill test certificates including full SS304 chemical composition and ASTM A262 intergranular corrosion test
Welding	ISO 5817 Level B (stringent); all welds ground smooth flush with parent material; post-weld pickling and electropolishing
Surface finish	Ra surface roughness measured at <=0.4um after electropolishing; particle shedding test per IEST-RP-CC004.3
Grounding	Electrical continuity test on each assembly; results documented in the shipment certificate
Cleanroom packaging	Components double-bagged in cleanroom-compatible polyethylene after final cleaning; outer export crate

Third-party cleanroom compatibility testing was performed by an independent laboratory on sample coupons, confirming particle shedding rates within ISO Class 7 limits.

Results

Metric	Result
Delivery timeline	All 52 platforms and 18 ladders delivered within the 10-week window, arriving 5 days ahead of Murata’s tool installation start date.
Cleanroom acceptance	Electropolished SS304 components passed Murata’s incoming cleanroom material acceptance protocol on first inspection. Zero rejections for particle contamination.
Grounding compliance	All assemblies tested below the <=1×10^6 ohms requirement. Average measured resistance: 3.2×10^4 ohms.
Installation efficiency	All-bolted design enabled the local installation contractor to complete the entire access system assembly in 12 working days with a 4-person crew — no specialist welders required.
Client feedback	“Dengtai understood cleanroom requirements at an engineering level, not just as a sales specification. The electropolishing recommendation and grounding continuity documentation demonstrated genuine technical capability.” — Murata Indonesia Facility Engineer

Lessons for Buyers

Cleanroom applications require different material finishing standards. Industrial-grade SS304 finishing is not sufficient for cleanroom use. Electropolishing adds approximately 15-20% to the component cost but is essential for particle control.
All-bolted designs enable local installation without specialist labor. By designing out field welding, Murata saved the cost of flying in certified cleanroom welders and reduced installation time by approximately 40% versus a welded installation approach.
Grounding continuity should be specified and tested at the factory. Pre-testing each assembly at the factory and providing a test certificate eliminated the need for on-site electrical testing of every connection point.
Electropolishing also improves chemical resistance. The electropolished SS304 components have shown no surface degradation after 2+ years of exposure to IPA, hydrogen peroxide vapor, and quaternary ammonium cleaning agents.

Products Used in This Project

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FAQ

Q: What special requirements do electronics manufacturing facilities have?

Cleanroom-adjacent areas require non-shedding materials and smooth surfaces that do not trap particulates. The steel platforms specified for this project used SS304 with 240# brushed finish for clean appearance and easy cleaning. All welds were ground smooth with no crevices that could harbor contaminants.

Q: How were 52 platform sets and 18 ladders coordinated?

This was Dengtai’s largest single-platform order. Production was managed as a dedicated project with its own production schedule and QC documentation. Platforms were numbered by building and floor level. Installation drawings showed exact platform positions relative to building grid lines.

FAQ

Q: What special requirements do electronics manufacturing facilities have for access equipment?

Cleanroom-adjacent areas require non-shedding materials and smooth, cleanable surfaces. Platforms and ladders must not trap particulates. All welds must be ground smooth. Stainless steel (SS304 minimum) is typically required. Documentation requirements are often demanding due to the regulated nature of electronics manufacturing.

Q: What was the key challenge for the Murata project?

The primary challenge was coordinating the fabrication of 52 platform sets and 18 ladders as an integrated system. Each platform had a specific building and floor location. Production was managed as a dedicated project with detailed CAD coordination to ensure all components fit at installation. Pre-assembly fit-check was performed on a sample basis before full production.

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