Epoxy foil resins

The “5M s.r.o.” company developed and has patented a very efficient technology for manufacturing sophisticated and relatively inexpensive composite structures called LETOXIT Foil Technology, to be abbreviated LF TECHNOLOGY. It’s one of the forms of RFI (resin film infusion) technologies.

It’s an easy way how to manufacture fibreglass parts with no harmful risks, involving easy application. The principle of our technology is to interpose dry fabric with layers of resin and a hardener in the form of some foil with an exactly defined thickness, which we offer under the brand name LETOXIT® LFX.

The lamination itself is very easy, progressively putting down layers of some reinforcement (layers of fabrics) and epoxide foil LETOXIT® LFX according to required final properties of such laminated material. We recommend this phase to be done with perforating the foil LETOXIT LFX to get better results. After stacking up all layers, air is sucked out in the whole composed layer to further put it into a hardening oven. The hardening process then requires a bit higher temperatures to liquefy resin in the first phase (resin melts down because of the temperature) to consequently impregnate (saturate) the fabric. In the second stage, the resin is then hardened under standard hardening temperatures (120°C). Nevertheless, there are also other types of resin, getting hardened at even 80°C.

This production technology is suitable for all possible applications that require having nice surface with keeping a clearly defined resin and reinforcement ratio.

ADVANTAGES

  • Time saving production – textile is saturated and cured in one step
  • No autoclave needed to use
  • Dry method of lamination free of odour and harmful substances
  • Three times faster method in comparison with liquid resins
  • Smooth and glossy surface of final products directly from the mould with no need to apply gelcoat
  • Financial costs savings when stored (compared to prepregs)

APPLICATION

  • Production of sandwich composite panels
  • Aviation (floors, interior and exterior composite parts, floors)
  • Car industry (production of tuning parts for motorbikes and cars)
  • Health care (x-ray tables production, composite orthoses)
  • Sport equipment (canoes, paddles, skis)

 

Epoxy foil resins
Resin LETOXIT Basis Curing Tg (°C) Max Tg (°C) Characteristics Techn. sheet
(°C)  (min)
LFX 023 epoxy 120 60 95 100 for glass fabrics  TL LFX 023 EN
LFX 035 epoxy 120 60 122 125 for carbon fabrics  TL LFX 035 EN
LFX 038 halogenated epoxy 120 60 127 135 self extinguishing (FAR 23)  TL LFX 038 en
LFX 056 epoxy 120 60 120 125 self extinguishing (FAR 25)  TL LFX 056 EN
LFX 060 epoxy 120
(80)
20
(240)
120 125 fast curing, for carbon  TL LFX 060 EN
LFX 062 phenolic 120 45 80 103 self extinguishing (DIN 5510-2, FAR 25)  TL LFX 062 EN
LFX 162 epoxy 120
(80)
20
(240)
95 100 fast curing, for glass  TL LFX 162 EN

Package

  • area weights 240 g/sqm, 360 g/sqm and 480 g/sqm
  • width of the roll 1000 mm
  • quantity on the roll depends on the area weight:
    • 240 g/sqm: 70 sqm on the roll
    • 360 g/sqm: 50 smq on the roll
    • 480 g/sqm: 40 sqm on the roll
  • minimal order 1 roll

The foil can be stored for 1 month at temperatures up to +20°C, for 3 months at +5°C and up to 1 year at -18°C without any change of its properties. Be sure not to exceed +30°C at transport and storage.

 

Technical data
Resin LETOXIT Density (g/cm3) Peak (120°C, min) Max. flexural stress (MPa) Flexural modulus of elasticity (GPa) Impact strength of pure resin (kJ/m2)
Pure resin Composite Pure resin Composite
LFX 023 1,19 4,65 120 – 125 540** 3 – 3,1 18,9** 45 – 50
LFX 035 1,19 5,5 120 – 125 580** 3,2 – 3,3 17,1** 30 – 35
LFX 038 1,39 10,5 100 610** 3,2 – 3,3 19,5** 12
LFX 056 1,35 6 110 480*** 3,3 – 3,4 15*** 22
LFX 060 1,19 4 145 487*** 3,2 14*** 24,7
LFX 062 1,19 9,4
LFX 162 1,28 3,7 540** 18,9**

** 12 layers glass fabric 163 g/m2 twill + 5 layers Letoxit LFX 300 g/m2. Resin content 44%
*** 12 layers glass fabric  163 g/m2 twill + 8 layers Letoxit LFX 200 g/m2. Resin content 50%

 

 

Application video

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