3M
Scotchcast Electrical Resin 260
TM
One-Part, Class H, General Purpose
Epoxy Powder Resin
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Fast curing
Excellent electrical properties
Excellent thermal shock and impact resistance
Excellent heat, chemical and moisture resistance
Good cut-through resistance
Excellent flow
UL 1446 and IEC 85 Electrical Insulation System (EIS)
approval at class 120 (E), 130 (B), 155 (F) and 180 (H).
Also available as Scotchcast 260 CG, a coarse ground
version for improved electrostatic spray applications.
3MTM ScotchcastTM Electrical Resin 260 is a widely used,
well-known general purpose powder epoxy resin. A onepart, green pigmented, rapid heat-curing product, it is
designed to provide a continuous, tough, moisture and
chemical resistant dielectric coating to a variety of
substrates.
Scotchcast resin 260 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.
Resin 260 is applied to an object that has been heated to a
temperature above the melting point of the resin. On
contact with the preheated application surface, the resin
melts, flows to a controlled extent, then cures, bonding to
the substrate and coalescing into a smooth, continuous,
essentially uniform, thick coating. It effectively coats flat
surfaces and corners, as well as high points. Uses for
Scotchcast resin 260 include moisture proofing and
insulating armatures, stators, buss bars and toroid cores.
Typical Properties*
Property
Colour
Specific Gravity1 (cured)
Electric Strength3 – 250 to 375 microns or 12 to 15 mil coating
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
Cut-Through Resistance2 – 504g wt; 18 awg wire
Abrasion Resistance2 – Removed from 250 to 375 microns coating
Edge Coverage2 – 250 to 375 microns coating on flat
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
Value
Green
1.43
39,4 kV/mm or 1000 V/mil
Passes
11.3 N/m
215oC (410oF)
.08 grams
35 – 45%
12 – 16 seconds
Usage Information
Handling and Safety Precautions
Method of Application
The rapid cure of ScotchcastTM Resin 260 permits the use of
high-speed production methods. The power can be readily
applied by spraying techniques as well as through the use of
fluid bed dipping of preheated parts. Automated and manual
types of application equipment are both available.
Equipment manufacturers names can be suggested upon
request.
Curing
The cure of resin 260 to a thermoset condition is a
time/temperature relationship. The retained heat in
application units having high capacity is sufficient in many
cases to effect a cure of the resin without the need for postcuring facilities. For example, if an application surface can
retain a temperature of 204oC (400oF) for 30 seconds after
coating, it will be fully cured. Small articles, or those with
large surfaces-to-mass ratio, lose heat rapidly and may
require a higher preheat temperature and/or additional ovencuring.
The figures below represent nominal guidelines for
obtaining the resin’s adhesion, impact and chemical
resistance characteristics.
Cure Temperature
149oC (300oF)
177oC (350oF)
204oC (400oF)
232oC (450oF)
Time
30 minutes
10 minutes
30 seconds
20 seconds
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.
Insulation System
Scotchcast resin 260 has undergone extensive thermal
testing, and has UL 1446 and IEC 85 system approval as
major insulation for use in motor, transformer and coil
constructions for continuous use at class H (180oC)
temperature. The product is listed by UL under File Number
E163090, system Designation 3M 180-1.
To achieve Underwriters Laboratories and the International
Electrochemical Commission (IEC) requirements
component construction must meet UL and IEC
specifications and conditions of acceptability for proper and
safe use of the component or product.
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 260, the part must be preheated to a
temperature ranging from 150oC (302oF) to 260oC (500oF).
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.
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.
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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Market Place, Bracknell
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Tel: +44 1344 858000
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