Thermal Compound Deposits contamination on surface before laser cleaning
Yi-Chun Lin
Yi-Chun LinPh.D.Taiwan
Laser Materials Processing
Published
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

CompoundConcentrationExposure LimitHazard ClassStatus
Carbon Monoxide5-50 mg/m³29 mg/m³toxic✓ Within Limit
Carbon Dioxide100-500 mg/m³9000 mg/m³irritant✓ Within Limit
Formaldehyde1-10 mg/m³0.37 mg/m³carcinogenic✓ Within Limit
Acetaldehyde1-15 mg/m³45 mg/m³carcinogenic✓ Within Limit
Particulate Polycyclic Aromatic Hydrocarbons2-20 mg/m³0.2 mg/m³carcinogenic✓ 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