The sizes of our cylinders vary depending on their materials.
Our steel cylinders come in 3.4, 10, 15, 40, and 47 L sizes, whereas aluminum cylinders in 3.7, 10, and 30 L sizes. In addition, cylinders of 35 and 118 L sizes that are dedicated for specific components are available.

We provide valve specifications to meet customer requirements as much as possible. If the specifications of the gas valve you purchased do not match your existing regulator or equipment, you may purchase another connector from us.

We mainly use 22-RH and 22-LH–grade valves depending on gas flammability and sometimes use Compressed Gas Association (CGA) 350–grade valves depending on gas components. If you provide us with the grade you require, we will let you know whether that grade is available.
The materials of the valves that we use include brass, nickel plating, and SUS. The valve grades for the materials are determined according to the manufacturers' classification, and we select from them to meet the characteristics of the manufactured products.

Our regulator types can be classified into brass-Ni plated and SUS-316 types in terms of material, and one- and two-stage types in terms of function. The advantage of our one-stage products, which have one depressurizer, is that they adsorb a little amount of the gas contents as they have a small internal volume. However, their downside is that the indication values of the secondary gauge fluctuate with changes in the internal pressure of the gas cylinders. The downside of our two-stage products, which have two depressurizers, is that they adsorb plenty of the gas contents as they have a large internal volume. However, their advantage is that their secondary gauge indication values remain constant regardless of changes in the internal pressure of the gas cylinders. Accordingly, one-stage products are mainly used for applications where pressure is regulated in real time, whereas two-stage products are mainly used for applications where maintaining a constant setting pressure is important. For example, two-stage products are used as an equipment carrier gas.

We manufacture most products based on orders through optimal cylinder processing, manufacturing, and analysis methods depending on the components, the concentrations, and other customer requirements, so manufacturing periods vary greatly depending on the products. Accordingly, we indicate product manufacturing lead time on our offer sheet to meet your requirements. However, for some products for which frequent orders are placed, or for products that require a long-term supply stability, we keep an inventory through advance manufacturing. For details, contact the overseas sales staff (sales@rigas.co.kr) of the Management Planning Division.

We supply industrial standard gases of various mixture ratios according to customer requests, and our products are used for various purposes such as environmental measurement, petrochemical processes, toxic gas measurement, foul odor measurement, volatile organic compounds, excimer laser, and research/experiment. We also deal with various types of refrigerant gases and sell related parts such as regulators for high-pressure gases, analysis-specific regulators, and cylinder stands.

Standard gases are designated with durations during which their attribute values are maintained (guaranteed). To identify their duration of use (effectiveness), check the expiration dates indicated on their test reports and labels. Although you may use them after their expiration dates, we recommend that you conform to the expiration dates so that you can have the correct measurement values as the attribute values of some products may change after their expiration date.

We manufacture all products through the gas gravimetric method (ISO 6142: Gas Analysis—Preparation of Calibration Gas Mixtures. Part 1: Gravimetric Method), an absolute measuring method that maintains the traceability to the mole unit of the International System of Units (SI). In other words, we maintain traceability to KRISS Class 1, Weights, using the gas gravimetric method.
For some components, we carry out inspection to check if they conform to our quality control system by making a comparative analysis with the CRMs provided by national institutions (KRISS, NIST, VSL, NPL, etc.). In other words, RIGAS rechecks if traceability is maintained by verifying that the attribute values of the RIGAS CRM match those of the CRMs of the national institutions within the allowable uncertainty in the measurement.

We can provide the detailed data of the analysis equipment, conditions, chromatograms, etc., that are related to the product supplied to you if you request such information from us. However, for products that we did not supply, you may be required to pay a certain amount.

RIGAS analyzes products using various analysis methods. The analysis methods may vary depending on the components. For products of the same components, the analysis methods may vary depending on the concentration ranges. Therefore, if you provide us with the product components and concentrations to be analyzed, we can inform you of the analysis method and equipment.
Gas analysis requires a line that connects the cylinder with the equipment, a pressure regulator, an MFC for the flow control, an MFC controller for the setting flow of the MFC, and fittings for connecting related components.