We (Hong Kong Specialty Gases Co., Ltd.) have many years of experience in providing ultra high pure gases and gaseous chemicals. We assure you a reliable supply of high quality products. Our comprehensive line of pure gases assures the proper purity of your specific application.
Pure gases from Hong Kong Specialty Gases are classified by grade, since common purity designations such as Perpurified or High Purity vary among different suppliers and therefore have little meaning. Please read the following table for more information about the grading of our gases.
| Grade: |
Purity: |
Total Impurities: |
| 7N |
99.99999% |
100ppb |
| 6N |
99.9999% |
1ppm |
| 5N5 |
99.9995% |
5ppm |
| 5N |
99.999% |
10ppm |
| 4N5 |
99.995% |
50ppm |
| 4N |
99.99% |
100ppm |
| 3N5 |
99.95% |
500ppm |
| 3N |
99.9% |
1000ppm |
