Vaisala Inline Refractometers – Precise Chemical Process Control for Vietnam’s Semiconductor Industry

Context: Why Vietnam Stands Out

Unlike South Korea, where the semiconductor industry is heavily concentrated in front-end wafer fabrication, Vietnam is emerging primarily as a hub for OSAT (outsourced semiconductor assembly and test) operations, with major players such as Intel, Samsung, Amkor, and Hana Micron present, alongside a new wave of investment into high-tech industrial zones in Bac Ninh, Bac Giang, and Ho Chi Minh City.

This creates a distinct type of demand for inline process refractometers: rather than focusing solely on etching-chemical monitoring at large-scale fab operations, demand in Vietnam is more closely tied to controlling cleaning solutions, CMP chemicals, and surface-treatment solutions used in advanced packaging processes.

Key Growth Drivers in the Vietnamese Market

1. The FDI wave into semiconductors and electronics. Vietnam is attracting large-scale foreign investment in chip assembly, packaging, and testing. Every new plant that comes online drives investment in process quality-control systems, with real-time chemical concentration measurement being a mandatory component.

2. Pressure to improve yield and reduce scrap. As factories in Vietnam gradually take on higher value-added stages—not just basic assembly—requirements for process control precision increase significantly, pushing companies to replace manual, intermittent measurement methods with inline sensors.

3. Chemical safety and environmental standards. Increasingly strict regulations on chemical handling and industrial wastewater in Vietnam are compelling businesses to invest in more precise monitoring equipment, both to ensure compliance and to optimize chemical input costs.

4. The shift toward Industry 4.0. Integrating measurement data into SCADA/MES systems is becoming standard practice at FDI-backed plants, creating opportunities for sensor lines with strong digital connectivity.

Challenges Specific to Vietnam

• Most high-precision measurement equipment still has to be imported, making upfront investment cost and delivery lead time key competitive factors.
• The pool of technicians skilled in operating and calibrating advanced optical instruments remains limited compared to long-established semiconductor hubs like Taiwan or South Korea.
• Demand for after-sales service (maintenance, calibration, on-site technical support) is very high, since plants run continuously around the clock with little tolerance for downtime.

The Solution: Vaisala Inline Refractometers – Authorized Distribution by Filterfine Vietnam

In processes such as cleaning, etching, or CMP, even a small deviation in chemical concentration can affect product defect rates. Instead of manual sampling and waiting on lab results, inline refractometer sensors enable:

• Real-time measurement and response, without disrupting production
• Reduced scrap through immediate detection of deviations
• Direct integration into SCADA/MES systems to support factory digitalization

Purpose-built for liquid chemical processes in the semiconductor industry, the Polaris™ PR53S is a modern concentration-measurement instrument specifically designed for semiconductor manufacturing and ultrapure chemical processes. Built with premium materials such as ultra-pure PTFE and sapphire, the instrument ensures optimal durability in harsh chemical environments without requiring frequent maintenance.

Key specifications

• Refractive index measurement range: 1.32–1.53 nD (equivalent to 0–100 °Bx)
• Accuracy: ±0.0002 nD (equivalent to ±0.1 °Bx)
• Repeatability: ±0.0000033 nD
• Resolution: ±0.000001 nD
• Response time (T63): 10 seconds with standard low-pass filtering
• Measurement cycle: once per second

Standout features

Ultra-pure, durable materials. With fully non-metallic wetted parts made of ultra-pure PTFE and a sapphire measurement chamber, the PR53S withstands demanding, highly corrosive chemical environments that require exceptional cleanliness.

Accuracy unaffected by impurities. Advanced refractive index (RI) measurement technology delivers consistently stable readings, unaffected by air bubbles, suspended particles, or solution color.

Optimized for inline installation. With no moving parts, the device minimizes routine maintenance needs. Its compact design fits pipelines from ¼ to 1 inch, with support for multiple connection types including Flare and Pillar fittings.

Smart connectivity ecosystem. Easily integrates with Vaisala Indigo520 transmitters or the Indigo80 handheld device for data management, graphing, and quick configuration via Vaisala Insight software.

Authorized Distribution Partner in Vietnam

Filterfine Vietnam is Vaisala’s officially authorized distributor in Vietnam, ensuring customers receive:

• Genuine, fully certified equipment
• Technical support, calibration, and on-site maintenance
• Solution consulting tailored to each specific production line

Beyond its semiconductor-specific line, Vaisala also offers the Polaris platform—a next-generation optical refractometer family for inline liquid concentration measurement across a range of other industries (food and beverage, pharmaceuticals, industrial chemicals)—reflecting a product ecosystem broad enough to meet demand beyond semiconductors alone.

Contact Filterfine Vietnam today for expert consultation on the right inline refractometer solution for your plant.