Quality Standards
Precision-tested acetylene meeting international industrial standards
At Jirut Industrial, quality is not just a goal—it's our foundation. Every cylinder of acetylene undergoes rigorous testing to ensure it meets or exceeds Thai Industrial Standards (TIS) and Japanese Industrial Standards (JIS) requirements.
Internationally Recognized
TIS 229-2540
Thai Industrial StandardThe primary standard governing acetylene gas quality in Thailand. Defines two quality classes based on purity and contaminant levels.
JIS K1902-1980
Japanese Industrial StandardInternational benchmark for dissolved acetylene quality. Widely recognized across Asia for industrial gas applications.
Purity & Contamination Limits
Detailed specifications for each quality grade. Lower contamination levels indicate higher purity.
| Parameter | Class 2 Industrial | Class 1 Laboratory | AA Grade Premium | JIS K1902 Japan |
|---|---|---|---|---|
| Acetylene Purity | ≥ 98.0% | ≥ 99.5% | ≥ 99.6% | ≥ 98.0% |
| Phosphine (PH₃) | < 500 ppm | < 50 ppm | < 25 ppm | — |
| Hydrogen Sulfide (H₂S) | < 500 ppm | < 50 ppm | < 25 ppm | — |
| Moisture (H₂O) | < 0.25% | < 0.25% | < 0.25% | — |
| Ammonia (NH₃) | — | — | — | — |
Class 2 - Industrial Grade
Standard grade suitable for general welding, cutting, and heating applications. Cost-effective solution for everyday industrial use.
Class 1 - Laboratory Grade
High-purity grade for precision welding and applications requiring minimal contamination. 10x lower impurity levels than Class 2.
AA Grade - Premium
Ultra-high purity for specialized laboratory and research applications. Exceeds standard requirements with 99.6% purity.
Testing Methods
Purity Measurement
Acetylene purity is measured using DMSO (Dimethyl Sulfoxide) absorption method, providing accurate quantification of acetylene content.
Contaminant Detection
GASTEC sampling pump with specialized detector tubes measures phosphine, hydrogen sulfide, and ammonia levels in parts per million (ppm).
Flame Quality Test
Oxy-acetylene flame testing verifies gas quality. Proper purity produces a light blue inner cone flame reaching approximately 3,000°C.
Flame Temperature Reference
Oxy-acetylene flame quality indicator
Behind the Scenes
A glimpse into our quality control processes and production facilities.
Our Quality Commitment
With over 50 years of experience, we have built our reputation on consistent quality and reliability. Every batch is tested, every cylinder is inspected, and every customer receives the same premium standard that has defined Jirut Industrial since 1974.