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Test results are shown below:- Laser marks were made on type 304 stainless steel tags using a CO2 Laser. Tags
were totally immersed in the test solutions. |
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| Exposure Time | ||||||
| Organic Solvents | 1 Hour | 12 Hours | 24 Hours | 1 Week | ||
| Gasoline | No effect | No effect | No effect | No effect | ||
| Limonene | No effect | No effect | No effect | No effect | ||
| Methyl Ethyl Ketone | No effect | No effect | No effect | No effect | ||
| N-Butanol | No effect | No effect | No effect | No effect | ||
| Mineral Spirits | No effect | No effect | No effect | No effect | ||
| Xylene | No effect | No effect | No effect | No effect | ||
| Acetone | No effect | No effect | No effect | No effect | ||
| Propylene Carbonate | No effect | No effect | No effect | No effect | ||
| Ethanol | No effect | No effect | No effect | No effect | ||
| DMSO | No effect | No effect | No effect | No effect | ||
| Motor Oil | No effect | No effect | No effect | No effect | ||
| Acid/Bases | ||||||
| Hydrochloric Acid 35% | No effect | No effect | See notes below | |||
| Nitric Acid 68% | No effect | No effect | No effect | No effect | ||
| Sulfuric Acid (conc.) | No effect | No effect | No effect | No effect | ||
| Acetic Acid 99.5% | No effect | No effect | No effect | No effect | ||
| Hydrogrn Peroxide 30% | No effect | No effect | No effect | No effect | ||
| Sodium Hydroxide 25% | No effect | No effect | No effect | No effect | ||
| Ammonium Hydroxide 20% | No effect | No effect | No effect | No effect | ||
| Other | ||||||
| Boiling H2O | Soaked in boiling water for 1 hr. - no effect | |||||
| LN2 (Cold) | Dipped in liquid nitrogen - no effect | |||||
| Flame (Hot) | Heated in propane flame until cherry red - metal | |||||
| discolors, no effect on mark. | ||||||
| Hot/Cold Cycling | Marks heated red hot and immediately plunged in liquid nitrogen | |||||
| - metal discolors, no effect on mark | ||||||
| Notes: | ||||||
| Hydrochloric acid testing: | - Acid dissolves the steel tag and was not run over 12 hrs. long | |||||
| - After 1 hr. acid dissolved 0.2767 gms off of steel tag (4.7%), | ||||||
| laser mark was unaffected. | ||||||
| - After 12 hrs. acid dissolved 1.8057 gms off of steel tag (30.6%), | ||||||
| laser mark was unaffected, now having a distinctly raised feel. | ||||||
| Sulfuric acid testing: | - Acid discolors at approximately 96 hrs., mark appears to be | |||||
| slightly discolored. | ||||||
