

Alessandro MorettiPh.D.Italy
Laser-Based Additive ManufacturingPublished
Dec 16, 2025
Hydraulic Fluid Contamination Contamination
Hydraulic-fluid contamination, it arises from leaks in heavy machinery, where petroleum-based oils seep gradually under vibration and pressure, forming sticky deposits that harden into tenacious oily films. These contaminants, they distinguish themselves by persistent adhesion that penetrates surfaces, unlike dry dust or watery residues; on steel, layers build slowly and tenaciously, aluminum shows quicker pore-deep spread, while concrete absorbs profoundly, yielding darkened stains. Removal proves challenging, as solvents fail against embedded oils and scraping risks damage, yet laser cleaning excels, its pulses vaporizing films effectively without harming substrates.
Safety Information
Critical safety data for laser removal operations
Fire/Explosion Risk
moderate
Toxic Gas Risk
high
Visibility Hazard
moderate
Required Personal Protective Equipment
Respiratory Protection
PAPR
Eye Protection
goggles
Skin Protection
gloves
Hazardous Fumes Generated
| Compound | Concentration | Exposure Limit | Hazard Class | Status |
|---|---|---|---|---|
| Acrolein | 0.5 mg/m³ | 0.23 mg/m³ | toxic | ⚠️ Exceeds Limit |
| Formaldehyde | 1.2 mg/m³ | 0.37 mg/m³ | carcinogenic | ⚠️ Exceeds Limit |
| Carbon Monoxide | 15 mg/m³ | 29 mg/m³ | toxic | ✓ Within Limit |
| Particulate Polycyclic Aromatic Hydrocarbons | 0.8 mg/m³ | 0.2 mg/m³ | carcinogenic | ⚠️ Exceeds Limit |
Ventilation Requirements
Air Changes Per Hour
12
Exhaust Velocity
0.5 m/s
Filtration Type
carbon
Particulate Generation
Respirable Fraction
70%
Size Range
0.1 - 10 μm
Substrate Compatibility Warnings
- •Laser may ignite residual hydraulic fluid causing flash fire
- •Thermal decomposition creates toxic byproducts even at low laser powers
- •Surface may become slippery from fluid mobilization

