Why Choose Our Ultra High Purity Fittings
- Made from 316L high-purity stainless steel and the sulfur content ≤ 0.005%.
- Compliance with international standards such as ASME, 3A, ISO9001 and so on.
- Offer a complete product range and support non-standard sizes and structural customization.
- Provide technical support including suggestions, pressure verification and welding guidance.
Reliable Ultra High Purity Fittings Supplier
Our premium-grade 316L material quality, surface roughness Ra ≤ 0.3 μm, and tolerances consistently maintained within ±1mm are critical factors to keep your system’s long-term reliable operation.
Through comprehensive manufacturing processes and strict quality control systems, our ultra high purity fittings keep stable performance in high-purity gas, high-purity chemicals, and clean fluid systems, providing a reliable fluid connection foundation for your production line.
Types of Ultra High Purity Fittings
Mainly used to change the flow direction of the pipeline, such as 90° or 45° turns. The inner wall is smooth and electro-polished to reduce particle deposition and turbulent pollution.
The three-port designs switch the flow direction or divert the fluid in the UHP system. And they adopt curved transitions to offer you no dead corners in the flow path.
Adopting a streamlined transition with electro-polishing treatment, make your fluid smoothly transition at the variable diameter position and avoid materials accumulation or pollution.
Used to support, position and fix the key pipeline connection points. Commonly applied in high-pressure joints, diaphragm valve interfaces and connection segments of key equipment.
Features of Ultra High Purity Fittings
The stainless steel’s sulfur content is less than 0.005% and extremely low impurities, which can reduce particle contamination and metal ion leaching for you.
The ordinary hygiene level Ra is usually ≤ 0.8μm, while OMSS ultra high purity fittings usually achieve Ra less than 0.25μm or lower to meet your needs.
UHP systems usually adopt butt welding, face sealing or metal sealing structures. These maintain stable sealing under high pressure or high vacuum conditions.
Adopt streamlined inner wall transition structures to avoid right-angle turns or structural dead corners, allowing flow smoothly and decrease particle deposition and pollution accumulation.
It can operate stably for several years or even over ten years, significantly saving the cost from spare parts procurement and replacement.
From liquid nitrogen cryogenic (-196℃) environment to CVD process high temperature (above 300℃), the ultra high purity fittings can maintain dimensional stability and reliable sealing.
High-purity 316L combined with an electro-polishing surface can effectively enhance your ultra high purity fittings’ corrosion resistance and reduce pollution.
Standardized dimensions and precise processing make it easier to match with your piping system, which saves installation time and decreases the adjustment workload.
Customization Capability
OMSS offers a wide range of standard sizes from metric outer diameters of 6 mm to 154 mm, and supports special sizes and structural designs as well. If you need non-standard elbow angles, special connection forms, or customized pressure ratings, we can also provide matching solutions based on the pipeline layout and operating conditions.
Testing and Verification
Each batch of ultra high purity fittings undergoes hydraulic tests, pneumatic tests, and welding performance tests to keep consistency in size, surface quality, and welding performance. Before leaving the factory, we will conduct comprehensive tests such as pressure, leakage, surface roughness, and particle size. Moreover, we can provide you with a complete verification package, including material certificates, cleaning reports, roughness reports and dew point tests.
Packaging and Clean Protection
We will seal all the ultra high purity fittings’ connection ports with special plastic protective caps to avoid particles or dust from entering during transportation. And each pipe fitting is packaged independently and protected by double or multiple layers of clean bags to save the external contamination risk. At the same time, we can also provide cleanroom grade packaging services for you to ensure the product is clean and reliable from production to on-site installation.
Applications of Ultra High Purity Fittings
The large amount of high-purity gases and chemicals need to be transported through pipelines to production equipment with extremely high purity requirements in the semiconductors and electronics. Due to its high-purity materials, low-roughness inner surfaces, and highly reliable sealing structures, ultra high purity fittings can effectively reduce particle generation and contamination risks while ensuring stable sealing under high-vacuum or high-pressure conditions.
Ultra high purity fittings can effectively prevent internal wall residue and microbial attachment. And it can make your cleaning and sterilization operations more easy and convenient as well. For production lines that need to meet GMP audits, their stable material performance and high cleanliness surfaces can help enterprises more smoothly pass audits and validations, and decrease compliance risks in the production process.
In laboratories, high-end manufacturing, or special gas supply systems, high-purity nitrogen, argon, hydrogen or other special gases must maintain ultra-high purity. Ultra high purity fittings’ high sealing performance effectively avoids external air from entering the system and reduces the source of particles in the pipeline to give you stable purity gas. So they are commonly applied in gas pressure regulating units, distribution manifolds and equipment connection interfaces.
The high-value-added fine chemical production processes are extremely sensitive to product impurity levels. While using ultra-high purity pipe fittings can reduce the materials contamination risk in the pipeline system and minimize residue buildup within pipes. This enhances your products’ stability, which is commonly adopted for pure chemical transportation pipelines, reactor feed lines, and solvent distribution systems.
- Certificate of Compliance
Customer Reviews
We have strict requirements for surface finish and hygiene standards in pharmaceutical equipment. OMSS stainless steel fittings showed excellent workmanship, with smooth surfaces and precise machining. Their products helped us meet our equipment assembly requirements and maintain reliable production performance.
MichaelOMSS supported our custom stainless steel fitting project from drawing confirmation to final production. Their engineers provided useful suggestions on material selection and processing details. The finished components matched our requirements well and performed reliably in our food equipment applications.
JohnWe purchased sanitary tri clamp fittings and stainless steel ferrules from OMSS for our beverage processing system. The dimensions were accurate, the polishing was clean, and the fittings connected smoothly with our existing pipes without additional adjustment. The consistent quality helped us improve installation efficiency.
Emily
The biggest difference lies in the cleanliness level and manufacturing control standards.
Ordinary sanitary fittings are usually used in the food or beverage industry with a surface roughness Ra ≤ 0.8 μm. While Ultra high purity fittings are mostly used in semiconductor or pharmaceutical systems, they usually require an inner surface roughness with Ra ≤ 0.4 μm or even less than 0.25 μm, and undergo electrolytic polishing treatment.
In addition, UHP fittings have more stringent requirements in material composition control, welding end face structure, surface residue control, and cleanroom packaging.
The pressure and vacuum capacity of UHP fittings mainly depend on your structural design, material grade and connection method.
For common high-pressure models, the working pressure can typically reach 0 to 150 bar. In some special designs or small-sized fittings, the pressure level can be even higher. For applications requiring high vacuum conditions, such as semiconductor equipment or analytical instrument systems, our ultra high purity fittings can support vacuum levels of 10⁻⁹ mbar.
In ultra high purity systems, welding connections are usually more reliable than threaded connections.
Welding connections can form a continuous and smooth inner wall structure through orbital welding. This can fluid retention areas and particle accumulation points and also significantly reduces the leakage risk for your system.
In contrast, threaded connections are prone to gaps or hidden spaces, which are not conducive to maintaining the cleanliness for high-purity fluid systems. Therefore, they are less used in high-purity applications.
If the verticality, wall thickness consistency, or end roundness control is not strict,they may cause edge deviation, uneven inner wall in the weld seam, or local welding defects during the welding process. These problems affect the welding quality and also form particle sources or fluid dead zones in the system operation. So we usually strictly control the flatness, dimensional tolerances, and surface conditions for ultra high purity fittings to keep your pipeline inner wall remaining continuous and smooth after welding.
Even trace amounts of dust, oil, or chloride residues can affect the purity of gases or chemicals for high-purity fluid systems. Therefore, ultra high purity fittings usually undergo strict cleaning procedures before leaving the factory and are dried and packaged in a cleanroom environment.
This can avoid the product secondary contamination during transportation and storage, allowing the fittings to be directly used in a hundred or thousand-level cleanroom installation environment after unpacking.
What Are Ultra High Purity Fittings ?
The ultra high purity fittings also known as UHP fittings are high-precision fluid connectors specially designed for ultra-clean fluid transportation systems. During the long-term operation, they prevent particle generation, metal precipitation, gas leakage, and fluid contamination, which could guarantee the stability and cleanliness for the entire process system.
So they are widely adopted in semiconductor manufacturing, photovoltaic cell production, display panel manufacturing, biopharmaceutical engineering, special gas transportation systems, and high-purity chemical supply systems.
Connection of Ultra High Purity Fittings
Butt Weld
Butt Weld connection is one of the most common and reliable connection methods in ultra high purity systems. By using automatic track welding equipment to directly weld the pipes and pipe fittings, which can form an overall structure without dead corners or gaps, effectively avoiding particle retention and micro-leakage problems. If your project requires extremely high system sealing and stability, ultra high purity fittings with butt welded is usually the preferred choice.
Face Seal
Face Seal connection is a common detachable ultra high purity fitting connection method. The metal gasket undergoes slight plastic deformation under the clamping force of the nut, to fill the sealing surface to achieve a metal-to-metal seal.This design can provide you with high cleanliness, easy disassembly, and extremely low leakage rate, which meets requirements for high vacuum or special gas systems.
Metal Seal
Metal Seal connection is mainly used in high pressure, special gases, and high-reliability instrument systems. Compared to ordinary sealing, metal seal can still maintain stable sealing performance under high temperature, high pressure, and corrosive environments.
It should be particularly noted that in ultra-high purity systems, ordinary threaded connection structures are usually not recommended.
Installation Precautions for Ultra High Purity Fittings
Install In A Clean Environment
Ultra high purity fittings are usually packaged in double-layer clean packaging. It is recommended to open the packaging and install the fittings in a clean room or a partially clean environment to prevent particles in the air from entering the pipeline system.
Use Dedicated Cleaning Tools
Please use dedicated clean non-fibrous cloth, oil-free tools, and clean gloves to make your fittings and connection parts are not contaminated in any form.
Strictly Control Installation Torque
For VCR or face-sealed connection components, you’d better take calibrated torque wrenches for installation and lock them tightly according to the torque values specified in the product manual. Excessive torque may damage the sealing surface, while insufficient torque may lead to leakage.
System Purging After Completion
After installation, you need to purge with high purity nitrogen to remove tiny particles, residues, or solvents inside the pipe system. It is also recommended to cooperate with particle detection or leakage detection to avoid your system not meeting the design requirements.
