Core Differences Between Electronic Grade and Chemical Grade HBr: From Basic Chemical Raw Material to Semiconductor "Chip Food"

Hydrogen bromide (HBr), a highly acidic and reactive hydrogen halide gas, plays a dual role in the modern industrial system: it is both an indispensable synthetic raw material in the basic chemical industry and an irreplaceable key etching gas in advanced semiconductor manufacturing processes. Based on purity and application scenarios, HBr is mainly divided into two categories: chemical grade (industrial grade) and electronic grade. Although they appear to have the same chemical composition, there are fundamental differences in purity requirements, production processes, application value, and supply chain systems. This article systematically analyzes the essential differences between electronic grade and chemical grade HBr from six core dimensions.

I. Purity and Impurity Control: An Order of Magnitude Gap

Purity is the most core indicator distinguishing electronic grade from chemical grade HBr, with a difference of millions or even billions of times.

Chemical Grade HBr (Industrial Grade / 3N Level)

• Purity Range: 99.0%~99.9% (2N~3N)

• Main Impurities: Moisture (10\50ppm), free bromine (0.1%\0.3%), chlorides (0.02%\0.05%), iron ions (5\10ppm), heavy metals (≤5ppm), and small amounts of non-condensable gases such as nitrogen and oxygen

• Control Requirements: Only need to control the content of major impurities to meet general chemical reaction needs, with no special requirements for trace impurities

Electronic Grade HBr (5N/6N Level)

• Purity Range: 99.999% (5N) and above, with advanced processes requiring 99.9999% (6N)

• Key Impurity Control:

￮ Moisture: ≤1ppm (some processes require ≤100ppb), as HBr exhibits strong corrosiveness when moisture exceeds 2ppm, seriously affecting equipment life and product quality

￮ Metal Ions: Individual metal ions ≤0.1ppb, total metal impurities ≤10ppt (parts per trillion), complying with SEMI C37 international standards

￮ Particulates: Particle size <0.05 micrometers, with particle count strictly controlled to a few per cubic centimeter

￮ Volatile Organic Compounds: ≤10ppb

This extreme purity requirement stems from the nanoscale nature of semiconductor manufacturing: in a 3nm process, a single metal ion or tiny particle can cause the entire chip to fail, significantly reducing yield.

II. Production Processes: From Simple Synthesis to Extreme Purification

Chemical Grade HBr Production Process

The production process for chemical grade HBr is relatively mature and simple, mainly using the direct combustion synthesis method of bromine and hydrogen:

1. Pass hydrogen and bromine vapor into a synthesis furnace in a certain proportion

2. Combustion reaction occurs at high temperature to generate HBr gas

3. Obtain the finished product through simple post-treatment such as cooling, washing, and drying

The entire process mainly focuses on reaction conversion rate and energy consumption, with low requirements for purification links and low production costs.

Electronic Grade HBr Production Process

Electronic grade HBr cannot be directly synthesized. It must use chemical grade HBr as raw material and undergo complex multi-stage purification processes to meet requirements:

1. Pretreatment: Remove most moisture and heavy component impurities from the raw material

2. Multi-stage Distillation: Separate light components (such as H₂, N₂, O₂) and heavy components (such as Br₂, metal halides) using boiling point differences through light component removal and heavy component removal distillation towers

3. Deep Adsorption: Use high silica-alumina ratio acid-resistant molecular sieves, modified activated carbon, and other adsorbents to further remove trace moisture, organic matter, and metal ions

4. Precision Filtration: Remove all possible particulates through multi-stage nanoscale filters

5. Online Detection: Real-time monitoring of purity using high-precision analytical instruments throughout the process to ensure each batch of products meets standards

Leading domestic enterprises adopt the "three-stage distillation + molecular sieve adsorption" process, which can stably control the purity of electronic grade HBr at 99.9995% with impurity content below 0.5ppb, far exceeding industry standards.

III. Application Fields: From General Chemicals to Core Chip Manufacturing

Main Applications of Chemical Grade HBr

As a basic chemical raw material, chemical grade HBr has wide applications but low technical barriers:

• Organic Synthesis: Production of organic bromides such as methyl bromide, ethyl bromide, and dibromomethane as pesticide and pharmaceutical intermediates

• Pharmaceutical Industry: Synthesis of sedatives, anesthetics, antibiotics, and other drugs

• Petroleum Industry: As alkylation catalysts and completion fluid additives

• Inorganic Chemical Industry: Production of inorganic bromides such as sodium bromide and potassium bromide

• Dye and Fragrance Manufacturing: Participation in the synthesis of various bromine-based compounds

Core Applications of Electronic Grade HBr

Electronic grade HBr is a "bottleneck" material in semiconductor manufacturing, mainly used in dry etching processes:

• Logic Chip Manufacturing: In advanced transistor structures such as FinFET and GAA, used for precise etching of gates and fins, achieving ideal sidewall angles of 75°-85° and surface roughness <1nm

• Memory Chip Manufacturing: In DRAM and 3D NAND flash memory, used for selective etching of polysilicon, silicon nitride, and silicon oxide, with etching uniformity up to ±3% and critical dimension control accuracy of ±1.5nm

• Advanced Packaging: Used for copper pillar bump cleaning and through-silicon via (TSV) etching

• Flat Panel Display: Used in thin film transistor manufacturing for TFT-LCD and OLED

According to TechInsights analysis, HBr-based gas formulations account for more than 60% of the back-end metal interconnect layer etching in TSMC's 3nm process, confirming its irreplaceability in high-end processes.

IV. Packaging and Transportation: From Ordinary Steel Cylinders to Ultra-Clean Systems

Packaging and Transportation of Chemical Grade HBr

• Packaging Containers: Ordinary carbon steel cylinders with no special treatment on the inner wall, common specifications are 50kg and 250kg

• Storage Requirements: Cool and ventilated warehouse, temperature ≤30℃, away from fire and heat sources

• Transportation Requirements: Transported as Class 2.3 toxic gas and Class 8 corrosive substance, can be mixed with other non-incompatible chemicals

Packaging and Transportation of Electronic Grade HBr

• Packaging Containers: Electronic grade special cylinders with electrolytically polished and passivated inner walls, surface roughness ≤0.1μm, preventing metal ion precipitation and particle generation

• Cylinder Treatment: Each cylinder undergoes strict cleaning, drying, and leak testing before use to ensure no residual impurities

• Valve System: Equipped with special diaphragm valves and pressure reducing valves to prevent leakage and secondary contamination

• Transportation Requirements: Use special explosion-proof and corrosion-resistant vehicles with full GPS positioning and temperature monitoring, strictly prohibited from mixing with other chemicals

• Gas Supply System: In semiconductor factories, electronic grade HBr is delivered through specialty gas pipeline systems, which are specially designed and treated to ensure gas purity is not affected

V. Price and Market: The Huge Value Difference

Price Comparison

• Chemical Grade HBr: Relatively low price, mainly affected by bromine prices and energy costs

• Electronic Grade HBr: Price is 10~50 times that of chemical grade, and 6N grade products even more expensive

Market Size and Growth

• Chemical Grade HBr: Global market size is about several billion RMB, with steady growth mainly driven by demand from the basic chemical industry

• Electronic Grade HBr: Global market size reached 355 million by 2034, with a compound annual growth rate of 6.3%. With the global expansion of semiconductor production capacity and the upgrading of advanced processes, demand for electronic grade HBr will continue to grow rapidly.

Domestic Production Status

• Chemical Grade HBr: Sufficient domestic production capacity, fully self-sufficient

• Electronic Grade HBr: Long-term dependence on imports, with a domestic production rate of less than 30%. Currently, only a few domestic enterprises have mass production capacity for 5N grade HBr, and 6N grade products are still in the pilot or verification stage. The U.S. Department of Commerce has included high-purity hydrogen halide gases in the export control list, highlighting supply chain security risks.

VI. Quality Standards and Certification: From Industry General to Customer Customization

Quality Standards for Chemical Grade HBr

• Implements national or industry standards, such as GB/T 1415-2009 "Industrial Hydrobromic Acid"

• Fewer testing items, mainly including conventional indicators such as main content, free bromine, chlorides, and iron content

• Low certification requirements, generally only need to pass ISO 9001 quality management system certification

Quality Standards for Electronic Grade HBr

• Implements SEMI C37 standard formulated by the International Semiconductor Equipment and Materials Institute (SEMI)

• Dozens of testing items, including trace indicators such as all metal ions, non-metallic impurities, particulates, and moisture

• Extremely high certification requirements: The certification cycle for electronic grade HBr by semiconductor manufacturers is as long as 12~18 months, involving multiple aspects such as gas purity, batch stability, cylinder cleanliness, and gas supply system compatibility

• Customization Requirements: Different semiconductor manufacturers and different process nodes may have different impurity requirements for HBr, and suppliers need to provide customized products and services according to customer needs

Summary: Core Differences and Future Trends

Although electronic grade and chemical grade HBr have the same chemical formula, they are essentially two completely different products: Chemical grade HBr is a general chemical raw material pursuing cost-effectiveness; electronic grade HBr is a high-end electronic material pursuing extreme purity and stability.

The core differences between the two can be summarized as:

1. Purity Difference: From 99.9% to over 99.999%, impurity control from ppm level to ppb and even ppt level

2. Process Difference: From simple synthesis to complex purification processes of multi-stage distillation + deep adsorption

3. Value Difference: Price difference of 10~50 times, electronic grade HBr is a key material in the semiconductor industry chain

4. Barrier Difference: Low technical barriers for chemical grade HBr, high technical barriers and long certification cycles for electronic grade HBr

In the future, with the global transfer of the semiconductor industry to China and the continuous upgrading of advanced processes, the market demand for electronic grade HBr will continue to grow. Accelerating the localization process of electronic grade HBr and breaking through 6N ultra-high purity technology are of great significance for ensuring the security of China's semiconductor industry chain.