Product Overview

High-Purity Nitrogen is an inert, non-reactive gas essential for industries where even trace impurities can compromise product integrity, process stability, or analytical accuracy. Obtained through advanced air separation and purification technologies, this gas is characterized by extremely low levels of oxygen, moisture, hydrocarbons, and other contaminants. As the ultimate protective and purging medium, high purity nitrogen is indispensable for preventing oxidation, contamination, and unwanted chemical reactions in sensitive environments. The reliable supply of High-Purity Nitrogen is a cornerstone for manufacturing excellence in electronics, pharmaceuticals, and advanced materials.

Basic Information

CAS No.	7727-37-9
UN No.	UN1066 (Nitrogen, compressed) or UN1977 (Nitrogen, refrigerated liquid)
Molecular Formula	N₂
Hazard Classification	2.2 (Non-flammable, non-toxic gas) – primarily an asphyxiant in confined spaces.

Key Attributes & Parameters

Purity	Available in standardized grades
Critical Impurity Specifications (for 99.999% Grade)	Oxygen (O₂): < 3 ppmv Moisture (H₂O): < 3 ppmv (often <1 ppmv for advanced applications) Total Hydrocarbons (THC): < 0.5 ppmv (as CH₄) Carbon Dioxide (CO₂): < 1 ppmv Particulates: Filtered to 0.01 μm or better.
Physical State	Colorless, odorless, tasteless gas; supplied as a compressed gas or a cryogenic liquid for bulk efficiency.
Dew Point	Can reach -76°C or lower, indicating extreme dryness.

Features & Advantages

Ultra-Inert & Dry Atmosphere

Provides an environment virtually free of oxygen and moisture, crucial for protecting sensitive materials from oxidation, hydrolysis, and degradation.

Superior Contamination Control

Extremely low levels of hydrocarbons and particles prevent surface contamination, film defects, and catalyst poisoning in high-tech manufacturing.

Consistent Process Performance

Guaranteed purity ensures repeatable results in critical processes like semiconductor doping, heat treating, and pharmaceutical packaging, enhancing yield and quality.

Versatile and Safe

As a non-flammable, non-reactive gas, it is safe for a wide range of applications, from blanketing flammable chemicals to purging pipelines and reactors.

Functional Characteristics

The primary function of High-Purity Nitrogen is to create and maintain controlled, inert atmospheres. It acts as a blanketing gas to displace oxygen and moisture from headspaces in tanks and packaging. As a purging gas, it evacuates air and contaminants from process equipment and pipelines before operation or between product changeovers. In analytical applications, it serves as a carrier or zero gas. Its inertness stems from the strong triple bond between nitrogen atoms, making it unreactive under most conditions. For critical applications, point-of-use purifiers are often employed to achieve the final purity level required at the tool.

Primary Application Fields

Semiconductor & Electronics Manufacturing

Used in wafer fabrication for purging, blanketing, sputtering, and as a carrier gas. Critical for processes like chemical vapor deposition (CVD), etching, and annealing.

Pharmaceuticals & Biotechnology

Blanketing of oxygen-sensitive products, purging of reactors and filling lines, inerting for solvent recovery, and packaging to extend shelf-life (Modified Atmosphere Packaging - MAP).

Metals & Heat Treatment

Providing inert atmospheres for annealing, sintering, and brazing to prevent scaling and decarburization of high-value metals.

Analytical & Laboratory

Serves as a carrier gas in Gas Chromatography (GC), purge gas in Spectroscopy, and for instrument calibration.

Food & Beverage

Nitrogen flushing in packaging (e.g., for coffee, snacks) to prevent oxidation and spoilage.

Laser Cutting

Used as an assist gas for cutting non-ferrous metals like aluminum to achieve clean, oxide-free edges.

Customer Collaboration Case

A contract manufacturer producing advanced micro-electromechanical systems (MEMS) sensors for automotive safety was struggling with low production yields. A root cause analysis identified that trace oxygen and moisture in their furnace atmosphere during a critical annealing step were causing oxidation and stress in the delicate silicon structures. We implemented a tailored high purity nitrogen supply solution, delivering 99.9995% nitrogen with guaranteed oxygen levels below 1 ppm and moisture below 2 ppm. We designed a closed-loop delivery system with real-time oxygen analyzers at the furnace inlet. The consistent, ultra-dry inert atmosphere provided by our high purity nitrogen eliminated the oxidation issue. This intervention resulted in a 25% increase in functional device yield per wafer and significantly improved the long-term reliability of the sensors. This partnership demonstrated that our High-Purity Nitrogen was not merely a utility but a critical process parameter enabling next-generation device manufacturing.

FAQ

Q: How are UN numbers and hazard categories determined for the export of hazardous chemicals? What are the consequences of incorrect classification?

A: The UN numbers and hazard categories are determined based on the physical and chemical properties of the products (such as flash point, corrosiveness, toxicity), in accordance with the "United Nations Recommendations on the Transport of Dangerous Goods". For example, ethanol has UN1170 (Class 3 Flammable Liquids), and sodium hydroxide has UN1824 (Class 8 Corrosive Substances). Incorrect classification can result in: invalid customs declaration, customs seizure and fines, safety accidents during transportation, and possible legal liability. Our company has professional hazardous goods classification personnel to verify and issue authoritative transportation assessment reports to ensure accurate classification.

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