HexWeb® HRH-10

HexWeb® HRH-10 product line and mechanical properties when tested per MIL-STD-401B using 12.7mm core thickness. The typical values represent the mean average of a relatively large number of test values obtained from many blocks of honeycomb.

*Manufactured with various raw material configurations, mechanical properties vary accordingly

Dielectric Constant

HexWeb® HRH-10 has been evaluated and approved for numerous specifications. In addition, HexWeb® HRH-10 meets the following parameters and properties: Configuration - The cell size of hexagonal core will give the nominal cell dimensions in mm across the flats (nodes) of the cell. Cell size determination will be made by measuring the length of 10 consecutive cells in 6 random locations and averaging the results. Visual defects (offset sheets, double layers, localized cell distortion, nodal delamination, color variation, resin coat uniformity and surface finish) are inherent to the process and allowable defects as long as density and mechanical properties are obtainable. Anything considered significant or potentially prejudicial will be communicated in advance of delivery for assessment. Density - The tolerance on honeycomb density, when measured on a minimum of 1640 cm3 of core, will be ±10%. Flame Retardance - HexWeb® HRH-10 will meet the “self extinguishing” classification of FAA Air Crash Worthiness Rules and Regulations Section 25.853.* Water Migration - Does not exceed one cell water migration in 24 hours when tested per MIL-STD-401B.

Several honeycomb cores have been tested for thermal conductivity. The figure to the right shows the results of this evaluation for HexWeb® HRH-10. The thermal conductivity constant varies with cell size and core thickness because the air convection affects inside the cells. Note the following values were obtained with the heat flow from top to bottom of the panel.

HexWeb® HRH-10 has been tested for shear and compressive strength at elevated temperatures and time exposures up to 500 hours. Because the Nomex softens between 230 to 260°C, the properties drop off rapidly at those temperatures; however, when returned to ambient conditions, most of its original strength is retained.

HexWeb® HRH-10 honeycomb is typically available in the following sizes.

Thickness Tolerance

Tolerances on cut thickness are as follows:

• 3 to 50mm tolerance will be ± 0.125mm
• 50 to 100 tolerance will be ± 0.25mm
• 100mm and over tolerance will be ± 3.0mm
• Tolerance for block purchases will be ± 50.0mm

Different L, W & T tolerances may be available upon special request, subject to review. For large volume requirements it may be possible to supply sheets to your specific size at little or no additional charge. Please be aware tight tolerances are not always possible because of the flexible nature of this material.

Dimensional Nomenclature
T = Thickness
L = Length in the ribbon direction
W = Width in the direction of expansion, or direction perpendicular to the ribbon

Hexagonal Cell

Overexpanded Cell