HexWeb® CR III

Identification & Functionality

Chemical Family

Aluminum Compounds

Core Type

Aluminum Honeycomb

Composite Materials Functions

Core Material

Technologies

Composite Materials

Product Families

Composite Materials — Core Materials

Honeycomb

Features & Benefits

Materials Features

Corrosion Resistant,

High Strength

Product Highlights

• Aerospace structural grade honeycomb
• Excellent corrosion resistance
• Highest strength and rigidity to weight ratio as a sandwich core
• Maintain corrosion protection at elevated temperatures
• Available in 5052 and 5056 alloys

Applications & Uses

Markets

Automotive & Transportation,

Electrical & Electronics

Applications

Electrical & Electronics — Parts & Components

Housings & Enclosures

Automotive & Transportation — Transportation

Aerospace & Aviation,

Marine,

Rail & Mass Transit

Applications

Aluminum HexWeb® CR III Specification Grade honeycomb materials are predominantly used in sandwich structures to meet design requirements for highly engineered structural components. As a structural core material, it finds applications in all types of aerospace vehicles and supporting equipment where sandwich structure offers rigid panels of minimum weight, aerodynamic smooth surfaces, and high fatigue resistance. The same structural properties are also used for commercial applications such as tools, snow and water skis, bulkheads, and floors. Other nonstructural uses are directional air/fluid flow control, RF shielding, and energy absorption.

Properties

Mechanical Properties

Mechanical properties of HexWeb® CR III 5052 and 5056 alloy honeycomb are shown in Table I and II, respectively. A major advantage of the HexWeb® CR III organo-metallic polymer coating over typical coatings is that HexWeb® CR III is much more resistant to salt spray exposure combined with a prior elevated temperature exposure. Shear strength retention after 350°F heat aging for up to 500 hours and 30-day salt spray exposure is approximately 88% of room temperature properties with no salt spray exposure; weight loss is considerably less than the maximum permissible per MIL-C-7438 for corrosion resistant aluminum honeycomb.

Table I: HexWeb® CR III 5052 Hexagonal Aluminum Honeycomb
Typical values (typ) are presented below, as well as minimum average (min) for a product type.

Cell Size	Nominal Density pcf	Compressive Strength					Crush Strength psi	Plate Shear
		Bare		Stabilized				L Direction			W Direction
		Strength psi		Strength psi		Modulus ksi		Strength psi		Modulus ksi	Strength psi		Modulus ksi
	typ	typ	min	typ	min	typ	typ	typ	min	typ	typ	min	typ
1/8	3.1	285	200	300	215	75	130	210	155	45	130	90	22
1/8	4.5	550	375	570	405	150	260	340	285	70	220	168	31
1/8	6.1	980	560	1020	680	240	450	560	455	98	340	272	41
1/8	8.1	1500	1000	1560	1100	350	750	800	670	135	470	400	54
1/8	10	2100p	1575p	2250p	1685p	-	-	980p	735p	175.0p	550p	415p	65.0p
1/8	12	2700	2100	2900	2200	900	-	1940l	1250l	-	1430l	1000l	-
5/32	2.6	220	150	240	160	55	90	165	120	37	100	70	19
5/32	3.8	395	285	410	300	110	185	270	215	56	165	125	26.4
5/32	5.3	690	490	720	535	15	340	420	370	84	270	215	36
5/32	6.9	1080	770	1130	800	285	575	590	540	114	375	327	46.4
5/32	8.4	1530	1070	1160	1180	370	800	760	690	140	475	420	56
3/16	2	160	90	175	100	34	60	120	80	27	70	46	14.3
3/16	3.1	290	200	335	215	75	130	210	155	45	125	90	22
3/16	4.4	520	360	550	385	145	250	330	280	68	215	160	30
3/16	5.7	820	560	860	600	220	390	460	410	90	300	244	38.5
3/16	6.9	1120	770	1175	800	285	575	590	540	114	375	328	46.4
3/16	8.1	1600	1000	1720	1100	350	750	725	670	135	480	400	54
1/4	1.6	90	60	100	70	20	40	85	60	21	50	32	11
1/4	2.3	190	120	210	130	45	75	140	100	32	85	57	16.2
1/4	3.4	340	240	370	250	90	150	230	180	50	140	105	24
1/4	4.3	500	350	540	370	140	230	320	265	66	200	155	29.8
1/4	5.2	590	500	760	510	190	335	410	360	82	265	200	35.4
1/4	6	990	630	1100	660	235	430	530	445	96	340	265	40.5
3/8	1	50	20	55	20	10	25	45	32	12	30	20	7
3/8	1.6	90	60	95	70	20	40	85	60	21	50	32	11
3/8	2.3	190	120	200	130	45	75	135	100	32	80	57	16.2
3/8	3	285	190	310	200	70	120	200	145	43	125	85	21.2
3/8	3.7	370	270	410	285	105	180	250	200	55	160	115	26
3/8	4.2	520	335	560	355	135	220	310	255	65	200	150	29

Test data obtained at 0.625 inch thickness

p = preliminary
x = predicted values
I = beam shear for 12.0 pcf products.

maximum block size 48 in. x 60 in., maximum thickness = 1.00 in.

Table II: HexWeb® CR III 5056 Hexagonal Aluminum Honeycomb
Typical values (typ) are presented below, as well as minimum average (min) for a product type.

Cell Size	Nominal Density pcf	Compressive Strength					Crush Strength psi	Plate Shear
		Bare		Stabilized				L Direction			W Direction
		Strength psi		Strength psi		Modulus ksi		Strength psi		Modulus ksi	Strength psi		Modulus ksi
	typ	typ	min	typ	min	typ	typ	typ	min	typ	typ	min	typ
1/8	3.1	320	250	350	260	97	170	250	200	45	155	110	20
1/8	4.5	710	475	690	500	185	320	440	350	70	255	205	28
1/8	6.1	1120	780	1200	825	295	535	690	525	102	400	305	38
1/8	8.1	1750	1200	1900	1300	435	810	945	740	143	560	440	51
5/32	2.6	250	180	265	185	70	120	200	152	37	115	80	17
5/32	3.8	450	360	500	375	140	235	335	272	57	195	155	24
5/32	5.3	820	615	865	650	240	420	550	435	85	325	250	33
5/32	6.9	1220	920	1340	1000	350	650	760	610	118	430	360	43
3/16	2	190	110	200	120	45	75	140	105	27	85	50	13
3/16	3.1	380	250	410	260	97	170	265	200	45	150	110	20
3/16	4.4	620	460	670	490	180	310	425	340	68	245	198	27
3/16	5.7	920	685	1000	735	270	480	565	480	94	330	280	36
1/4	1.6	100	75	110	80	30	50	90	78	20	60	38	10.5
1/4	2.3	240	145	265	155	58	100	180	130	32	100	62	15
1/4	3.4	400	300	480	315	115	200	290	230	50	175	130	22
1/4	4.3	580	440	620	465	172	300	400	325	67	230	190	27
1/4	5.2	790	600	820	645	230	410	490	425	84	300	245	32
3/8	1	55	25	60	35	15	35	55	45	15	35	25	6.8
3/8	1.6	100	75	110	80	30	50	90	78	20	60	38	10.5
3/8	2.3	215	155	225	155	58	100	170	130	32	95	62	15
3/8	3	320	240	340	260	92	160	245	190	43	145	100	19

Test data obtained at 0.625 inch thickness.

Technical Details & Test Data

Specifications

HexWeb® CR III expanded aluminum honeycomb materials meet the requirements of Military Specification MIL-C7438 where applicable.

Packaging & Availability

Standard Dimensions

Dimensional Nomenclature

T = Thickness, or cell depth
L = Ribbon direction, or longitudinal direction
W = Transverse direction, or direction perpendicular to the ribbon

HexWeb® CR III 5052 and 5056 aluminum honeycomb is available in the following standard size:

On special orders Hexcel has the capability of manufacturing HexWeb® CR III honeycomb panels in the L dimensions up to 60 inches maximum, W dimensions up to 150 inches maximum, and T dimensions up to 34 inches maximum, subject to limitations on some products. Larger sizes may be produced by splicing.

L	W	Nominal Sq.Ft.
48 in. + 3 in. - 0 in.	96 in. + 4 in. - 0 in.	32

Dimensional Tolerances
Tolerances on cut thickness for standard size and smaller sheets are as follows:

Sheet Thickness	Standard Tolerances
0.250 in. to 3.999 in.	± 0.005 in.
4.000 in. and over	± 0.062 in.