Hydraulic Fluid Contamination contamination on surface before laser cleaning
Alessandro Moretti
Alessandro MorettiPh.D.Italy
Laser-Based Additive Manufacturing
Published
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

CompoundConcentrationExposure LimitHazard ClassStatus
Acrolein0.5 mg/m³0.23 mg/m³toxic⚠️ Exceeds Limit
Formaldehyde1.2 mg/m³0.37 mg/m³carcinogenic⚠️ Exceeds Limit
Carbon Monoxide15 mg/m³29 mg/m³toxic✓ Within Limit
Particulate Polycyclic Aromatic Hydrocarbons0.8 mg/m³0.2 mg/m³carcinogenic⚠️ 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