3M
Scotchcast Electrical Resin 265
TM
One-Part,
Unfilled Epoxy Powder Resin
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Class B (130oC)
Fast curing
Excellent electrical properties
Excellent thermal shock and impact resistance
Scotchcast resin 265 is manufactured by a fusion blend
process, insuring that each individual particle of powder
contains all the components necessary to effect a complete
cure and attain stated performance properties.
3MTM ScotchcastTM Electrical Resin 265 is a widely used,
well-known general-purpose powder epoxy resin. A onepart, general purpose, clear, rapid curing product, unfilled
powered epoxy resin system capable of coating various
substrates.
Typical Properties*
Property
Value
Colour
Specific Gravity1 (cured)
Electric Strength3 – 250 to 375 microns or 12 to 15 mil coating
Clear
1.16
51.3 kV/mm or 1300 V/mil
Thermal Shock2 – 10 cycles – 75oC to 155oC
250 to 375 microns, 3.2mm sandblasted steel panel
Impact Resistance2
250 to 375 microns, 3.2mm sandblasted steel panel
Gardner 15.9mm Radius Impact Tester
Thermal Conductivity4
Abrasion Resistance2 – Removed from 250 to 375 microns coating
Gel Time2 @ 193oC hot plate
*Not recommended for specification purposes. Product specifications will be provided upon request
Test Methods
1 – ASTM D-792
2 – 3M Test Method
3 – ASTM D-149
4 – MIL-I-16923E
Passes
18.0 N/m
4.9 x 104 (cal/sec/cm2/oC/cm)
.20 grams
60 seconds
Usage Information
Method of Application
Coating is accomplished by using either standard or
electrostatic spraying or fluid bed techniques. Before
application of the powder, the part to be coated must be
heated to a temperature above the melting point of the resin.
On contact with heated article, the resin melts, flows out and
bonds to the substrate. The powder can be applied
electrostaically to either a hot or cold part. A post cure is
usually required to cure the product fully.
Conventional varnish and trickle impregnation resins used
for wire holding and anchoring of performed coil windings
can be replaced by ScotchcastTM Resin 265 in applications
where only impregnation of the outermost windings is
required. Fluid bed dipping is the most common means of
applying the powder in this type of application. Preheating
of the coils can be accomplished by conventional means of
by resistance heating. The latter allows for selective
deposition of the powder on only the windings.
Self-support coils can also be fabricated using this resin,
thereby eliminating the need for bobbins, strapping and
taping. In such a coil winding application, wire is run
through a 15-20% solution of resin 265 in acetone. (In using
solvents, care must be exercised as recommended by their
supplier to prevent health of flammability hazards.) After a
solvent flash, the individual laminations can be handled and
stacked as if they were bare laminations. Completed stacks
can then be bonding using only contact pressure and heat.
Bonding of stator, rotor and transformer laminations is
another use ScotchcastTM Resin 265. The advantages are the
elimination of bolts, rivets, pins and welds and the reduction
of eddy currents and operating noise. A 15-20% solution of
resin 265 in acetone is applied to individual laminations
before stacking. After a solvent flash, the individual
laminations can be handled and stacked.
Curing
The cure of resin 260 to a thermoset condition involves a
time/temperature relationship. The figures opposite indicate
the temperature and time necessary to obtain the resin’s
adhesion impact and chemical resistance characteristics.
Time does not include that required to reach the cure
temperature. The user must determine the time required for
the coated substrate to reach listed temperatures.
Preheated Temperature Range
Prior to applying resin 265, the part must be preheated to a
temperature ranging from 163oC (325oF) to 232oC (450oF).
The optimum preheat temperature depends upon the size,
heat capacity and configuration of the object to be coated, as
well as the method of application. The ideal coating
temperature will vary for each application and is best
determined by experimentation.
Handling and Safety Precautions
Read all Health Hazard, Precautionary, and First Aid
statements found in the Material Safety Data Sheet and/or
product label of chemicals prior to handling or use.
Storage
Laboratory evaluation indicates that the usable shelf life of
this product is twenty four months (24) from the date of
manufacture when stored at temperatures not exceeding
27oC (80oF), providing the material is stored in its original
container. Care should be taken when removing resin form
the original shipping container to prevent inclusion of
foreign material. After resin removal, the bag should be
retired immediately. This will help to avoid agglomeration
caused by excess moisture. For best results, store in a cool,
dry place.
Important Notice
Technical information provided by 3M is based on experience and/or tests
believed to be reliable but their accuracy is not guaranteed and the results
may not be relevant to every user’s application.
Cure Temperature
149oC (300oF)
177oC (350oF)
204oC (400oF)
232oC (450oF)
Time
30 minutes
10 minutes
30 seconds
20 seconds
For this reason 3M does not accept responsibility or liability, direct or
consequential, arising from reliance upon any information provided and the
user should determine the suitability of the products for their intended use.
Nothing in this statement will be deemed to exclude or restrict 3M’s liability for
death or personal injury arising from its negligence.
All questions of liability relating to 3M products are governed by the seller’s
terms of sale subject where applicable to the prevailing law.
If any goods supplied or processed by or on behalf of 3M prove on inspection
to be defective in material or workmanship, 3M will (at its option) replace the
same of refund to the Buyer the price of the goods or services.
Except as set out above, all warranties and conditions, whether express or
implied, statutory or otherwise are excluded to the fullest extent permissible at
law.
3M is a trademark. Printed in the UK. Copyright 3M United Kingdom PLC
3M
Electronics &
Insulation Group
3M United Kingdom PLC
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