TUW-1904 Electronic Coating

TUW-1904 Electronic Coating raises solids to 4%, so a single pass lays down 0.5–6 μm — two to three times the thickness of the 2% grades. Thickness buys a longer diffusion path for corrosive species: in salt spray, sulphur-bearing gas and cleaner immersion, thin coatings tend to fail first, and adding thickness is the most direct fix.
TUW-1904 Electronic Coating is also stable to 175 °C and visible under blue or UV light, which suits whole-board protection for automotive electronics, outdoor equipment, industrial controls and coastal high-humidity sites. The trade-off is slower drying and higher consumption, so the selection logic is simple: 1700 or 1902 indoors, 1904 where the environment is genuinely aggressive.

 

- Appearance: Transparent liquid
- Solids content: 4% fluoropolymer
- Carrier solvent: Hydrofluoroether (HFE)
- Density (25 °C): 1.52 g/mL
- Flash point: None
- Film thickness (reference): 0.5–6 μm
- Thermal limit: Polymer withstands 175 °C
- Inspection: Visible under blue or UV light

 

1. PCB moisture and corrosion protection — Boards and modules facing salt spray, corrosive gas or repeated cleaning.
2. Anti-migration barriers — Grease and oil creep control on displays, motors and lubricated assemblies.
3. Hydrophobic and oleophobic surfaces — Repellency against water, hydrocarbons, silicones and photoresists.
4. Rework-friendly process — Solvent removal and local strip before solder repair.

 

Thicker films are less forgiving of surface contamination — oil causes dewetting and pinholes, so clean or plasma-treat first. A single very heavy coat can skin over while still wet underneath; extend drying or apply two passes.
Keep solution below 150 °C and dry film below 250 °C at 16–27 °C and under 60% RH. For rework, swell with the matching solvent and peel; strip locally before soldering so the thicker film does not impair wetting.
Thicker film also means more fluid: at equal area, TUW-1904 Electronic Coating consumes roughly twice what a 2% grade does, so quote on delivered film thickness rather than price per kilogram. On deep holes and blind cavities the coat builds at the entry and thins inside — adjust spray angle and confirm by cross-section.

 

1 kg, 5 kg and 20 kg pails with 500 g samples. Stocked in South China and shipped with TDS, SDS and batch COA.