3M Scotchcast 265 Resin | 3M Scotchcast Powder Resins

3M Scotchcast Powder Resins

3M Scotchcast 265 Resin

3M Scotchcast 265 Resin is a 1-part, powder electrical resin used to coat flat surfaces, corners and high points. This general purpose epoxy based 3M Scotchcast resin has a low melt viscosity and minimum build making this unfilled powder ideal for a variety of coating, bonding, and saturation applications.

Scotchcast 265 is a powder which is simply applied to the heated windings where it melts, flows into the wire interstices and cures.

3M Scotchcast Electrical 262 is made from a fusion blend process to provide a complete cure and meet required performance properties. It offers a continuous, tough moisture and chemical resistant dielectric coating to a variety of substrates.

It is ideal for applications that need excellent thermal and mechanical shock resistance. Its high dielectric strength offers excellent electrical insulating property to the resin, making it an ideal insulator for creating a barrier between 2 conductors.

3M Scotchcast Electrical Powder Resins

Typical Property Data – Powder Resins

3M Electrical Powder Resin Product Number – 265
Temperature Class – H
Cure Schedules (Temp/Time) – 149°C (300°F) 60 min, 177°C (350°F) 20 min, 204°C (400°F) 5 min , 232°C (450°F) 2 min
Specific Gravity – 1.16
Cut-Through Resistance – N/A
Edge Coverage (%) – N/A
Impact Resistance (inch-lbs. Newton Meters) – 160 inch-lbs (18.1 J)
Gel Time @ 193°C Hot Plate – 60 sec. @ 380°F (193°C)
UL System 1446 Approved File Number E163090 – UL 1446 thermal classification of 200°C (392°F) helical coil and 180°C (356°F) twisted pair with MW 35 magnet wire. File number E309208
UL 746B Comp. – E309208
Dielectric Strength (volts/mil) – 1,300 V/mil (51 V/micron) 12-15 mil (305 μm to 183 μm) film thickness
Volume Resistivity (Ohm-Cm at 23°C) – 10¹⁴
Colour – Clear

3M 265 Powder Resin

3M Scotchcast Powder Resin Selection Process

The best way to select the proper 3M Scotchcast Powder Resin is to consider the needs of the application and the proposed application method.

Step 1: Define what needs to be coated

What is it that needs electrically insulated?

Motor stator or armature core?
Transformer wire?
Coiled assembly?
3M offers a number of epoxy powder coatings suitable for use on a variety of applications.

Step 2: Determine the coating application method

How large or small is the component? Are there complex, hard-to-reach areas that need to be insulated? Will intricate masking be needed?

Knowing the size and geometry of the component helps determine the feasibility of powder coating as well as determining which application method is the most efficient. The most common application methods are:

Fluid Bed Dip – Components are preheated and dipped into a powder fluid bed or powder hopper. The epoxy begins to gel immediately upon contact with the hot substrate.
Venturi Spray – Components are preheated and powder is applied using venturi nozzles or powder spray guns. The epoxy begins to gel immediately upon contact with the hot substrate.
Electrostatic Spray – Powder is sprayed using an electrostatic application gun. This is a common method used by powder coaters globally. Powder is positively charged either by a high-voltage corona or triboelectric friction. The charged particles adhere to grounded components. Parts can be coated at room temperature; however, thicker film builds are obtained when applying powder to preheated components.
Electrostatic Fluid Bed – This is similar in construction to a standard powder fluid bed; however, the air feeding the powder chamber is electrostatically charged, creating a cloud of powder. The charged particles from the cloud adhere to grounded components. Parts are typically at room-temperature when coated using this method.

Step 3: Select the 3M Powder Resin that best fits the needs

What temperature will the coating be subject to? Is UL Recognition of importance? What dielectric strength is needed? What heating methods are available to cure the powder coating?

These are only a few of the questions that should be addressed prior to selecting a coating. The chart which begins on page 16 of the brochure will list a number of performance criteria that can help narrow down the product selection.

The substrate to which the powder epoxy is being applied plays an important role in the adhesion performance of the coating.
The 3M Scotchcast Powder Resins adhere well to carbon steel, aluminium and copper.
Surface preparation, oxidation, existing insulation coatings and substrate alloy need to be taken into consideration.
To obtain the best adhesion, substrate cleanliness is absolutely necessary.
Alloy selection may have an impact on coating adhesion as well.