HexWeb HRH-36 and HRP/HTP — non-metallic honeycomb cores (para-aramid/phenolic, fiberglass/phenolic)

Country: · Model: HexWeb HRH-36, HRP/HTP

HexWeb HRH-36 and HRP/HTP are non-metallic honeycomb cores for lightweight sandwich panels, fairings, radomes, interior parts and wing high-lift devices. HRH-36 is made of para-aramid paper with phenolic resin, HRP/HTP of fiberglass, and works up to 177 °C.

HRH-36: KEVLAR N636 paper + phenolic resin; block size 48×96 inches; thickness 0.125–32 inches
HRH-36 density: 3.0–6.0 lb/ft³ (≈48–96 kg/m³), cell 1/8 inch; OX version 3/16
Compression HRH-36-1/8-3.0: ≈1.9 MPa (275 psi) unstabilized; L shear ≈1.5 MPa (215 psi)
HRP/HTP: fiberglass fabric + heat-resistant phenolic resin; service temperature up to 177 °C (350 °F); hexagonal, OX-Core, Flex-Core geometries

Request a quote All specifications

Technical specifications

HRH-36	KEVLAR N636 paper + phenolic resin; block size 48×96 inches; thickness 0.125–32 inches
HRH-36 density	3.0–6.0 lb/ft³ (≈48–96 kg/m³), cell 1/8 inch; OX version 3/16
Compression HRH-36-1/8-3.0	≈1.9 MPa (275 psi) unstabilized; L shear ≈1.5 MPa (215 psi)
HRP/HTP	fiberglass fabric + heat-resistant phenolic resin; service temperature up to 177 °C (350 °F); hexagonal, OX-Core, Flex-Core geometries
Conformity (HRP/HTP)	MIL-C-8073 Class II, AMS3715; tested per AMS-STD-401
Properties	low moisture absorption, thermal stability, good dielectric and thermal insulation properties, thermoformability
Processing	machining, forming to curvature to order
Shipping	Casa Grande, Arizona (USA)

Specifications are taken from the manufacturer’s technical documentation. Updated 11/06/2026.

Description

HexWeb HRH-36 is made from KEVLAR type N636 paper impregnated with phenolic resin; other resins are possible on request. The material absorbs little moisture, is thermally stable and has smooth cell walls. Compared with denser NOMEX honeycombs, it reduces the weight of the structure and thermoforms well. The designation reads as type, cell size, nominal density; for example, HRH-36-1/8-3.0 means a 1/8 inch cell and a density of 3.0 pounds per cubic foot. Standard densities are 3.0, 4.5 and 6.0 lb/ft³, and for curved parts there is the expanded OX version. Blocks are 48 × 96 inches in size, with a thickness from 0.125 to 32 inches. For HRH-36-1/8-3.0 the TDS gives a compressive strength of about 1.9 MPa and an L-direction shear strength of about 1.5 MPa. HRP, made of fiberglass fabric impregnated with phenolic resin, is designed for temperatures up to 177 °C (350 °F) with short-term excursions above, and HTP is a related series. Tests per AMS-STD-401 confirm conformity to MIL-C-8073 Class II and AMS3715. The slicing thickness tolerance is ±0.006 inch up to 2 inches and ±0.010 inch for 2–4 inches.

How to choose

The choice depends on temperature. For most sandwich parts where weight matters, aramid HRH-36 is taken, and where dielectric properties and heating up to 177 °C are needed (radomes, heat shields), the fiberglass HRP/HTP is suitable. Aluminum CR-PAA is better for panels in a corrosive environment, and for stiffened panels there is the STRUCTIL core.