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3M CeQUINBORD CGA Inorganic Insulating Board is a high inorganic content board composed primarily of glass fibers and microfibers, inorganic fillers, and less than 10 percent organic binders. It is capable of long-term performance at temperatures exceeding 250°C. CeQUINBORD CGA board is available as trimmed 48" x 48" (1220
mm x 1220 mm) boards in thicknesses ranging from 1/32" (.79 mm) to 3/8" (9.5 mm).

Agency approvals & self certifications

3M CeQUIN and CeQUINBORD Inorganic Insulating Papers are designed to provide high-temperature performance in electrical insulation systems. CeQUIN papers have undergone extensive thermal aging evaluation per UL 1446, “Standard for Systems of Insulating Materials – General,” and as a result are UL Recognized as suitable for use as major ground insulation in systems rated through Class 220(R).

Several UL Recognized Insulation systems are listed under IPT File No. E65007 in the OBJS2 category for Class 130(B), Class 155(F), Class 180(H), and 220(R) applications. This open file is free for use by any electrical apparatus manufacturer by contacting the nearest UL office. This file is also recognized by UL as being in compliance with International Electrotechnical Commission (IEC) Publication 85, “Thermal Evaluation and Classification of Electrical Insulation.”

RoHS 2002/95/EC


  • Dry-Type Transformers (ground, barrier, spacer sticks, core tubes, pads, end fill)
  • Spiral and convolute wound tubing
  • Traction motors, generators
  • Switchgear
  • Flame barrier applications for home appliances and electronic devices
  • Heat sinks
  • Specialty gaskets

Physical characteristics

The high inorganic content of CGA boards provides exceptional thermal and dielectric stability for high-temperature electrical insulation applications, along with good thermal conductivity to help dissipate heat build-up in electrical equipment. CGA boards are easily impregnated and fully compatible with standard varnishes and resins, and since they do not readily absorb moisture, they do not require extended drying time prior to saturation. CeQUINBORD CGA board is UL Recognized as suitable for use in electrical insulation systems rated from Class 130(B) through Class 220(R).

CeQUINBORD CGA board is a UL Recognized Component with both 94V-0 and 94-5VA Flame Class Ratings (1.6 mm minimum thickness). It can be used in applications
requiring flame retardant materials or where maximum resistance to flame burnthrough is required.

Typical properties

Not for specifications. Values are typical, not to be considered minimum or maximum.
Properties measured at room temperature 73 °F (~23 °C) unless otherwise stated.


Property Typical value Test method
Nominal thickness 0.8 mm
1/32 inch
1.6 mm
1/16 inch
2.4 mm
3/32 inch
3.2 mm
1/8 inch
4.8 mm
3/16 inch
6.4 mm
1/4 inch
ASTM D-654
Basis weight 0.88 kg/m2
1.6 lb/yd2
1.81 kg/m2
3.3 lb/yd2
2.6 kg/m2
4.8 lb/yd2
3.52 kg/m2
6.5 lb/yd2
5.18 kg/m2
9.5 lb/yd2
6.64 kg/m2
12.2 lb/yd2
ASTM D-202
Tensile strength, MD 55 lb/inch
96 N/cm
80 lb/inch
140 N/cm
130 lb/inch
228 N/cm
190 lb/inch
333 N/cm
215 lb/inch
376 N/cm
240 lb/inch
420 N/cm
ASTM D-828
Elongation, MD < 2% < 2% < 2% < 2% < 2% < 2% ASTM D-828
Dielectric strength 4.5 kV 12 kV 14 kV 20 kV 24 kV 28 kV ASTM D-149
Moisture absorption < 1% < 1% < 1% < 1%  < 1% < 1% ASTM D-644


Shelf life & storage

This product has a 5-year shelf life from date of manufacture when stored in a humidity controlled storage (10 °C/50 °F to 27° C/80 °F and <75% relative humidity).

All statements, technical information, and recommendations related to 3M’s products are based on information believed to be reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and determine if it is suitable for your intended application. You assume all risks and liability associated with such use. Any statements related to the product, which are not contained in 3M’s current publications, or any contrary statements contained on your purchase order, shall have no force or effect unless expressly agreed upon, in writing, by an authorized officer of 3M.

3M is a trademark of 3M Company.