Gillcore® HK is a Kevlar® N636 reinforced honeycomb. N636 is the commercial designation for DuPont's Kevlar paper for use in honeycomb core. It offers a significant 25% weight savings over Nomex® honeycomb.

Gillcore® HK is a Kevlar® aramid fiber reinforced honeycomb which is coated with heat resistant phenolic resin. Kevlar® honeycomb cores exhibit enhanced performance characteristics over Nomex® honeycomb core in the areas of weight, strength, stiffness and fatigue. Gillcore® HK provides a wide range of honeycomb types, including different cell sizes, cell geometries, paper thicknesses and densities, for commercial, military, aerospace and defense applications.


Para-Aramid Kevlar paper



Description Example

HK – 1/8 – 2.5 – OX


HK: designates aerospace grade Kevlar aramid fiber


1/8 (i.e.): cell size: 1/8, 3/16, 5/32 inches


2.5 (i.e.): nominal density: 2.0, 2.5, 3.0, 4.0, 4.5, 6.0lb/ft3


OX (i.e.): over expanded cells


HK131, HK132, HK141, HK162, HK163, HK262, HK322, HK1033, HK1061, HK2061, HK3061O



Hexagonal Core (ribbon dimension as block width)

Hexagonal Core (ribbon dimension as block length)

Overexpanded Core

L (Ribbon dimension)

Typical 48”




Maximum 65”

Maximum 96”

Maximum 50”

W (Dimension normal to ribbon)

Typical 96”




Maximum 144”

Maximum 48”

Maximum 144”


0.200 – 34”

0.200 – 34”

0.200 – 34”

Structural Orientation







Plate Shear:

L Direction



W Direction

Safety Datasheet


·         Physical state: Solid

·         Appearance: Flat Sheets and blocks

·         Color: Brown

·         Odor: Slight

·         pH: Not Applicable

·         Boiling point: Not Applicable

·         Flash point: Not Applicable

·         Vapor pressure: Not Applicable

·         Relative density: Not Applicable

·         Solubility: Insoluble in water

·         Reactivity: Not reactive under normal use and conditions

·         Chemical stability: Stable under normal use and conditions

·         Possibility of hazardous reactions: Hazardous polymerization will not occur

·         Incompatible materials: Strong oxidizing agents, strong acids and bases, especially oxalic and hydrofluoric acid and acyl halides

·         Hazardous decomposition products: Toxic fumes and gases, carbon dioxide, carbon monoxide, hydrogen cyanide, oxides of nitrogen and other toxic and irritation gases can be produced depending on condition of combustion

Technical Datasheet


·         Extremely high toughness, shear strength and shear modulus

·         Corrosion resistance

·         Fire resistant (self-extinguishing)

·         Excellent thermal stability

·         Good formability for curve forming


·         Exterior aircraft panels including trailing and leading edges, flaps, ailerons, radomes, fairings, helicopter blades, access panels and doors.

·         Sports and leisure industry such as surfboards, dividing berthing areas, staterooms and hulls for high-performance boats and ships.

·         Ceilings, walls and floors of portable structures. Heat formability for complex and contour components


·         Gillcore Kevlar honeycomb core is qualified to the following specifications:

·         Boeing BMS 8-124, Class 6, Type V, Grades 2.5, 3.0,4.0, 6.0; and Type VI, Grade 2.5

·         Airbus Industrie: AIMS 11-01-004 Grades D, F, P, T, W (ABS5341-A3, A5, C1, C5, C8)

·         Bell Helicopter: 299-947-386: Type 1, Grade A, Classes 2.0, 3.0, 4.5, and 6.0

·         Northrop-Grumman: ACS-MRS-5301, Class 1, 1/8” cell, 6 pcf density

·         Lockheed-Martin: 5PTMDL17-D

·         Meets flammability requirements of FAR 25.853 for cabin interiors and FAR 25.855 for cargo interiors