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Aviation Industry


  • Floor Boards

  • Bulk Heads

  • Galleys

  • Partitions

Core Specification For Aviation:

1. Core Specification :  This specification covers all metallic Honeycomb Floor Panels (This has been prepared as an equivalent to Boeing specification BMS-4-10N).
a)Metetrial                      3003- -Aluminum Foils

b) Aluminum Foil Thickness                    .068mm

c) Call size                                          6.3mm
d) Core Density                          85-100 kg/m3
2. Panel Specification : (Equivalent to Boeing BMS–4 10N Specification)   a) Panel Thickness                             10.4 mm
b) Face Sheet           Aluminum Alloy 202–T3(USA)
c) Face Sheet Thickness:

     i) Top  Sheet                                   .6 mm

    ii) Bottom Sheet                              .35 mm

3. Face Material:

For both top and bottom face, material specified in Section -2 shall be used.

4. Sandwich Construction:

i) Any sandwich bond line shall not have voids greater than 6.35 mm (.25in) in the maximum dimension. Inspection will be made on the peel test specimens.

ii) In any 150 mm* 150 mm area (6” *6”) 94 percent of bond line shall be void free and shall be bonded to the core and face sheets. Voids and bubbles less than 04 mm (1/6 in) shall be disregarded. Inspection will be made on peel test specimens.

iii) Splices in the face material shall be allowed only when specified in purchase order or in Engineering Drawing. When splices are allowed; splice plates shall be submerged and kept flush within 0.13 mm (0.005 in) across and for full length of the splice. The splice plates shall be of same thickness for the skin of splice. The Maximum gap at the splice shall not exceed 0.13mm (0.05 in). The distance between a splice in a top skin and a splice in a bottom skin shall not be less than 305 mm (12 in) except when the splice in the top skin runs perpendicular to the splice in bottom skin. The distance from the long edge of the splice plate to the nearest panel edge parallel to it shall not be less than 51 mm (2 in).

iv) The face of the panels shall be bonded to core with hot cutting (65c to 70c) modified epoxy adhesive.

5.1 Weight : Kg/mf2    : 3.42                                   Lb/ft2      : 0.80
5.2 Panel Thickness: i) Determine the thickness in accordance with ASTM C366 [Substitute the word ‘Panel’ for ‘Core’]                                 ii) Measure the thickness around periphery as inward as possible with the tester.
5.3  Warpage : When tested in accordance with section 6-3 of the panel shall not exceed 0.635 mm (0.025 in) per 305 mm (12in) of panel length or width.
5.4 Peel Strength : When tested in accordance ASTM1781 of the minimum 5 specimens tested at least 3 individual peel values shall not be less than 23.1 kg-mm [15lb-in] per 76 mm [3 in] width.                                                         Peel Clmber:                   [Kg cm]): 36.88
5.5 Resistance to Water Absorption : After immension in water in accordance with Section 6.3 the minimum peel strength value shall not be less than 70% of  value reported in Section 5.4.
5.6 Core Flatness : The test shall be carried in accordance with ASTMC 366. The bonding face of the core shall be flush within .5mm [.02in] across the splice for the full length of splice.
5.7 Core Shear Strength : Test shall be carried out in accordance with MIL-STD 401 core shear in bending. Use a span of 305 mm (12”) with quarter point loading.          b) Short Beam Shear Strength                  kg/mm2: 0.173                 Lb/in2: 246.0
5.8 Long Beam Bending :

Test shall be carried out in accordance with MIL-STD 401 Flexure of 508 mm [20”] long specimen with quarter point loading a cross head speed of 12.5mm [.5”] /minute. Specimen width shall be 76mm +_ 1.3mm (3”+- 0.05”).                          b) Flexural Strength.  Kg/cm2: 28.39                                           Lb/in2: 41*103

6. Material Test Methods : All tests are carried cut at ambient room temperature [16c to 29c]
6.1 Panel Weight : i) Weight the panel on a scale accurate to 4.5 gms (0.01-lb) and record the weight.                                                         ii) Determine and record the area of the panel in mtr2(lb/ft2).                                                  iii) Determine and record the weight in kg/mtr2 (lb/ft2).
6.2 Warpage :

i) Place the panel on flat, rigid surface with concave side up.                                           ii) Place straight edge across the concave side of the panel, from one edge to the other. The straight edge shall extent not more than 1.3 kg[3bl] per 305 mm[12”] of the panel width [the dimension perpendicular to the edge of the straight edge].

6.3 Resistance to Water :

i) Five transverse and longitudinal each of peel test specimens (to the dimension specified by ASTMD 1781) shall be submerged in distilled water at 21C to 26.6 for 30 Days +- 2 hours. The depth of the water above the specimen shall not be more than 25 mm (1”). The specimens shall then be removed, blotted dry and tested for peel strength in accordance to section 6.4 within 6 hours after removal from water.




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