Solid Boron Nitride - Grades M & M26

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Solid Boron Nitride - Grade A

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Solid Boron Nitride - Grades M & M26

Solid Boron Nitride Grade M is a truly hydrophobic advanced ceramic. Composed of boron nitride and silica, it is completely resistant to moisture and has a MIL-I-10A grade of L542, a test requiring immersion in water for 48 hours prior to testing at elevated frequencies. Grade M is suitable for the most severe electrical applications. It is an excellent refractory material at temperatures up to 1400°C, and is unparalleled in resistance to thermal shock.

Applications

	High temperature electrical insulators and vacuum furnace supports which require electrical resistivity, high temperature strength, thermal shock resistance and low chemical resistivity
	Crucibles and containers for high purity molten metals
	Tools and refractories for glass forming which provide non-wetting, non-B₂O₃ containing contacts
	Radar components and antenna windows which require exacting electrical and thermal properties

Typical Properties
Typical Chemical Analysis	Grade M	Grade M26
Boron¹	18-20.25%	26.5-28.7%
Nitrogen ¹	22.5-25.5%	32.8-35%
Oxygen²	-	-
Calcium¹	.01%³	.01%³
Silica (SiO₂)¹	60%	40%¹
Other Inorganic¹	.02%	.05%
Trace Metals	.05%	.05%
TOTAL	100%	100%
B₂O₃*	.2%	.2%

*B₂O₃ is given for clarification and is not part of the elemental analysis

¹ Wet Chemistry - ² LECO Oxygen - ³ Optical Emission Spectroscopy

Typical Physical Properties
Typical Physical Properties	Grade M	Grade M26
Percent BN:	40	60
Percent SiO₂:	60	40
	Parallel Perpendicular	Parallel Perpendicular
Volume Resistivity (ohm-cm) @ RT: @150°C:	1.7 x 10¹⁵ 5.1 x 10¹⁵2.4 x 10¹³ 3.3 x 10¹³	6.4 x 10¹⁴ 2.9 x 10¹⁵2.4 x 10¹³ 8.5 x 10¹³
Dielectric Constant (@ IMHz) @RT: microware frequency: @ RT, 8.8 GHz:	4.21 3.87 3.86 4.08	4.48 3.89 3.89 4.28
Dieletric Strength: volts/mil & (volts/mm)
Sample thickness: 10 mil. Tested up to 25kV) 25 mil	1670 (65748) >1000 (>39370)	1690 (66535) >1000 (39370)
Dissipation Factor (Loss tangent)
@RT @ 1 MHz @150°C @ 1 MHz @RT @ 8.8 GHz	.0016 .0035 .0017 .0055 .0011 .0005	.0017 .0061 .0094 .0062 .0039 .0006
Loss Factor @RT @ 1 MHz @150°C @ 1 MHz @RT @ 8.8 GHz	.0067 .0140 .0077 .0230 .0042 .0020	.0076 .0230 .0440 .0250 .0150 .0260
Surface Resistivity (ohms/ )@ RT @150°C	8.5 x 10¹⁶ 1.4 x 10¹⁵	4.2 x 10¹⁶ 1.5 x 10¹⁵