MATERIALS, ADHESIVES AND COATINGS
HexWeb CR-PAA — 5052/5056 aluminum honeycomb core with phosphoric acid anodizing
Country: · Model: HexWeb CR-PAA
CR-PAA is an aerospace aluminum honeycomb core made of 5052 and 5056 alloy foil, coated by phosphoric acid anodizing. It is intended for wing high-lift panels, flaps, floors, fairings and nacelle parts operating in a corrosive environment.
- Foil alloys
- 5052, 5056 (aerospace)
- Coating
- phosphoric acid anodizing (PAA) with a transparent protective film
- Designation
- CR-PAA – cell – alloy – density, e.g. CR-PAA-1/4-5052-4.3N (N — unperforated walls, P — perforated to order)
- Sheet
- 48 × 96 inches (+3/+4 inches), ≈32 ft²
Technical specifications
| Foil alloys | 5052, 5056 (aerospace) |
|---|---|
| Coating | phosphoric acid anodizing (PAA) with a transparent protective film |
| Designation | CR-PAA – cell – alloy – density, e.g. CR-PAA-1/4-5052-4.3N (N — unperforated walls, P — perforated to order) |
| Sheet | 48 × 96 inches (+3/+4 inches), ≈32 ft² |
| Thickness tolerance | ±0.005 inch (0.25–3.999 inches); ±0.062 inch (≥ 4 inches) |
| Density tolerance | ±10 % |
| Advantage | outperforms standard honeycomb per AMS-C-7438 in salt spray and crack growth tests |
| Processing | splicing, machining, forming to curvature |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The coating forms a transparent protective film that bonds to the aluminum surface as a dense, stable layer. In aviation, such anodizing is done before structural bonding, so it also increases the strength and durability of the skin-to-honeycomb joint. In salt spray and crack propagation tests the material outperforms the standard core per AMS-C-7438. The designation consists of type, cell size, alloy and density, for example CR-PAA-1/4-5052-4.3N, where N means unperforated walls (perforated P are made to order). The standard expanded sheet is 48 × 96 inches, about 32 ft². The thickness tolerance is ±0.005 inch for 0.25–3.999 inches and ±0.062 inch for greater thicknesses, and the density tolerance is ±10 %. The sheet can be obtained with adhesive splicing, with bevels, formed to curvature and drilled. Besides the hexagonal cell, Flex-Core, corrugated and reinforced higher-density honeycombs are produced.
How to choose
The 5052 or 5056 alloy and the cell size with density determine the load-bearing capacity, and perforation of the walls is needed if the assembly must be vented. Non-metallic HRH-36 is lighter, and HRP/HTP do not conduct current and withstand up to 177 °C. CR-PAA is chosen when the panel is in a humid or aggressive environment, and so that the aluminum protection matches the preparation before bonding.
Request a price and lead time
HexWeb CR-PAA — 5052/5056 aluminum honeycomb core with phosphoric acid anodizing. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What alloys is the CR-PAA foil made of?
From aerospace aluminum alloys 5052 and 5056.
What does the letter N in CR-PAA-1/4-5052-4.3N mean?
N denotes unperforated cell walls; perforated P are made to order.
What is the size of a standard CR-PAA sheet?
48 × 96 inches, equal to approximately 32 ft², in expanded form.
What are the density and thickness tolerances?
Density ±10 %. Thickness ±0.005 inch for 0.25–3.999 inches and ±0.062 inch for greater thicknesses.
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