

Yi-Chun LinPh.D.Taiwan
Laser Materials ProcessingPublished
Dec 16, 2025
Thermal Compound Deposits Contamination
Thermal paste contamination arises from silicone or metal-based materials used in CPU cooling systems and it forms when paste spreads beyond interfaces during assembly or operation. This contaminant shows unique greasy texture and strong adhesion so it differs from dry dust or oxide layers by resisting simple wiping. On copper and aluminum surfaces, it hardens over time and removal challenges include residue buildup because paste bonds tightly. Laser cleaning works effectively since pulses vaporize paste without harming underlying nickel-plated areas.
Safety Information
Critical safety data for laser removal operations
Fire/Explosion Risk
low
Toxic Gas Risk
moderate
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 |
|---|---|---|---|---|
| Carbon Monoxide | 5-50 mg/m³ | 29 mg/m³ | toxic | ✓ Within Limit |
| Carbon Dioxide | 100-500 mg/m³ | 9000 mg/m³ | irritant | ✓ Within Limit |
| Formaldehyde | 1-10 mg/m³ | 0.37 mg/m³ | carcinogenic | ✓ Within Limit |
| Acetaldehyde | 1-15 mg/m³ | 45 mg/m³ | carcinogenic | ✓ Within Limit |
| Particulate Polycyclic Aromatic Hydrocarbons | 2-20 mg/m³ | 0.2 mg/m³ | carcinogenic | ✓ Within Limit |
Ventilation Requirements
Air Changes Per Hour
12
Exhaust Velocity
0.5 m/s
Filtration Type
carbon
Particulate Generation
Respirable Fraction
80%
Size Range
0.1 - 10 μm
Substrate Compatibility Warnings
- •Thermal damage possible to underlying materials - conduct test patch first
- •May leave residue on certain substrates requiring secondary cleaning
- •Avoid use on heat-sensitive materials near electronics

