Technical data

General information

FITS PEI panels fulfils all FAA regulations for aircraft interiors. Both Airbus and Boeing performed the relevant tests. The FITS OSU values under 30/15 and smoke density < 5, ensure that FITS will also fulfil future requirements.

FITS PEI panels have totally supported facings; the vertical oriented foam provides the panels a very high compression strength; FITS’ bending strength is even better then Nomex panels. Strength and stress tests performed by Airbus, Bremen, confirm these excellent mechanical properties (further information on request).

The FITS design prevent panels having a L- or W-direction. The evenly distributed foam will ensure homogeneity over the whole panel and prevents side effects (gaps in the core structure).

The design of making facings and foam from the same polymer in one step, ensures a very high peel strength. This, together with the vertical foam, will make FITS panels very rigid and damage tolerant (both the facings and structurally).

FITS panels have a very high temperature resistance with a Tg of 215 °C. Even in hot or humid conditions, FITS properties are maintained. FITS panels only absorb 1% water, even after storing the panel for a period of 1 year at 80°C and at a 90% RH. Furthermore, there is no growth of fungus.

4 point bending test results


thickness
density foam
FITS panel*
10 mm
85 kg/m³
FITS panel*
8 mm
90 kg/m³
FITS panel*
6 mm
90 kg/m³
test
limit
Nomex panel*
11 mm
48 kg/m³ epoxy adh.
4-point bending
max. load
858 N A-t
(Airbus-tested)
810 N

645 N
(Airbus-tested)
700 N

730 N (L-dir.)

Maximum bending displacement 21 mm
24 mm
35 mm
15 mm
4-pnt bending
max. load 80 °C
730 N
85% retention
(Airbus tested)
675 N,
85 % retention
500 N
71 %
65% retention
Max. bending* displacement 20 mm
Panel weight g/m² 2570 g/m²
2440 g/m²
2300 g/m²
2435 g/ m²

*Facings: 2/2 glass fabric, style 7781, PEI resin impregnated (32 ± 1%) and consolidated,
ABS5036-A02, Ten Cate(Cetex) at both sides.

Mechanical properties in-situ foam

Preliminary data sheet

Properties of in-situ foam panels of 8-10 mm thickness.

Density 
in-situ foam
kg/m³
80
90
110 Test method
Compression strength Mpa
1.8
2.5
3.5 ASTM C365-57
Compression modulus Mpa
110
130
160
Shear Strength Mpa
0.8*
1.2*
1.5*
ASTM C273-61
Shear Modulus Mpa 12*
19*
26*
Flatwise tensile strength Mpa
2.5*
4*
5*
ASTM C297-61
Climbing drum peel strength N.mm/mm 80 90 125 ASTM D1781

* Minimum values, which are expected to be guaranteed in the production of larger panels;
Actual values are 10 - 15 % higher.

Impact properties


density
thickness
FITS panel*
85 kg/m³,
10 mm
FITS panel*
90 kg/m³,
8 mm
Nomex*
48 kg/m³, epoxy adh.
10 mm
Nomex**
48 kg/m³,
10 mm
Impact testing
Gardner impact test 10 inch/lb, dent, local no change in structural integrity 9.3 inch/lb,
honeycomb crushed, local no structural integrity
Gardner impact test
Part manufacturer
test results
About equal,
dent, local no change in structural integrity
About equal,
dent, local no change in structural integrity
About equal,
honeycomb crushed, local no structural integrity
Part manufacturer test results

* Facings 2/2 US style 7781, PEI, consolidated.
** Facings 2/2 US style 7781, cured phenolic.

Flammability

Flammability test results of FITS panels at Airbus in Bremen.

Panel configuration 2/2* 2/2* 2/2+dec.** 2/2 + dec.** Limit
Panel thickness  mm 6 10 6 10
Foam density kg/m³ 90 85 90 85
Panel weight kg/m² 2.26 2.58 2.26 2.58
Decoration film decor.

PSA PSA
OSU-total
2 min. kW/m² HR
8 8 28 27 65
OSU - peak
in 5 min.  kW/m² HRR
25 32 32 32 65
Smoke  density 3 1 57 52 150
Vertical Bunsen, 12 sec.
Burn length mm
After flame time(s)
After flame time drips
57
0
0
57
0
0
64
0
0
48
0
0
203
15
0
Vertical Bunsen, 60 sec.
Burn length  mm
After flame time(s)
After flame time(s) drips
118
0
0
92
0
0
125
0
0
93
0
0
152
15
3

*  Number of layers consolidated PEI US-style 7781 glass fabric (ABS5036-A02)

Recyclable at part level

In the future FITS parts can be recycled by:

1: Grinding and use it as short fiber injection molding material.
2: Solving the PEI from the parts, removing the solvent and re-use the PEI polymer in the manufacturing of films.
Grinding the glass fiber and melt the fibers to reuse it as glass
3: Solving the polymer and use the solution in the manufacturing of prepreg by solvent impregnation. Grinding the glass fiber and melt the fibers to reuse it as glass.

Thermal conductivity

according ISO 8301

Panel
FITS* t=10 mm
Foam: 85kg/m³
FITS* t=7.7 mm
Foam: 85kg/m³
FITS* t=20 mm
Foam: 90kg/m³
Nomex* t=10.9 mm
HRH: 448kg/m³, epoxy bonded 75 gr/m²
Temp. Average Cond. (W/mK) Average Cond. (W/mK) Average Cond. (W/mK) Average Cond. (W/mK)
0.0 °C 0.04197 0.04270 0.04395 0.04820
10 °C 0.04405 0.04421 0.04583 0.05101
20 °C 0.04572 0.04567 0.04764 0.05366
50 °C 0.05111 0.05040 0.05380 0.06208
-10 °C 0.04070 0.04204 0.04267 NT
Panel weight gr/m² 2582 2448 3528 2440

* Facings: ABS5036-A02, 2 layers of consolidated glass fabric US Style 7781 reinforced
PEI(PolyEtherimid) thermoplastic, Cetex from Ten Cate Advanced Composites.