AQUA-THERM BC-365 is a water soluble modified polyester varnish. This environmentally friendly varnish was especially developed for its excellent stability.

 

Features and advantages:

• Excellent moisture resistance
• Outstanding adhesion and flexibility
• Good bonding strength
• Excellent stability
• Fast curing cycle
• Flashpoint over 200°F
• MW-35 wire UL approved, compliant with ASTM D-3251 for twisted pair wire-180°C rating, and spiral coil-200°C rating. UL system can reach up to 220°C.

 

Product characteristics:

 

• Color/appearance when delivered: Transparent amber
• Percentage of solids: 65-75
• Specific gravity at 70°F: 1.11
• Viscosity at 77°F with Brookfield RTV Spindle #2 and 10rpm speed: 1,000-5,000 cps
• Coating thickness per side: 1-3 mils
• Drying time on copper strip at 300°F: 10-20 minutes
• Diluent: Water
• pH value: 8-10

 

Electrical characteristics:

 

Dielectric strength in dry state, compliant with ASTM D-115, measured in volts/meter:

Dry state: 3000

Wet state: 3000

 

Mechanical performance:

 

Bonding strength of MW-35 wire spiral coil after thermal curing, compliant with ASTM D-2519:

Temperature at 25°C: 30 pounds

Temperature at 155°C: 10 pounds

 

Applications:

The following cycle is recommended as a starting point for treating most equipment, but is for reference only:

 

Preheat the parts to 220°F.

Cool down to 110°F.

Soak in the varnish for 5-20 minutes.

Drain for 5-20 minutes.

Bake* for 4-6 hours at 275°F, or* for 2-4 hours at 300°F, or* for 1-3 hours at 325°F.

*Time is calculated from when the equipment reaches the baking temperature.

 

Dilution and paint maintenance:

For optimal results, BC-365 should be diluted with regular tap water before use. A starting solid content of 35% is recommended. Diluting one part water with one part varnish will result in approximately 35% solid content. After dilution, the pH value should be checked using a pH meter. If necessary, DOLPH’S VM-3008 pH adjuster should be used to adjust the pH to 9-10. If the pH of the local tap water is low, DOLPH’S T-362 diluent can be used for dilution.