Fiber composites since 1985

Other resin systems in fiber composites

In addi­tion to poly­ester, vinyl ester and epoxy, there are a num­ber of oth­er sys­tems with spe­cial prop­er­ties that are also used to pro­duce fiber composites:

Phe­no­lic resins
Phenolic’s are par­tic­u­lar­ly char­ac­ter­ized by high tem­per­a­ture resis­tance and low-smoke, large­ly non-tox­ic fire behav­ior. Room-tem­per­a­ture cur­ing sys­tems con­tain high­ly cor­ro­sive com­po­nents that make han­dling dif­fi­cult and attack machin­ery dur­ing post-pro­cess­ing. The mechan­i­cal prop­er­ties of phe­no­lic resins are poor, and they are brit­tle and fragile.

Cyanate ester
Cyanate esters, which have excel­lent di-elec­tric prop­er­ties, are used in the man­u­fac­ture of radomes and anten­na claddings. Com­bined with fiber rein­force­ments of quartz, these resins are vir­tu­al­ly radiotransparent.

When max¬≠i¬≠mum tough¬≠ness is required, polyurethanes ‚ÄĒ often com¬≠bined with oth¬≠er resins to increase their inher¬≠ent¬≠ly poor com¬≠pres¬≠sive strength ‚ÄĒ are the first choice. Cur¬≠ing requires iso¬≠cyanates, which are harm¬≠ful to health.

For air intakes in tur¬≠bine engines and oth¬≠er high-tem¬≠per¬≠a¬≠ture aero¬≠space appli¬≠ca¬≠tions, high tem¬≠per¬≠a¬≠ture strength (250¬įC) is required, which is achieved by bismaleimides.

At the upper end of the price scale are the poly¬≠imides at over EUR 80/kg. They sur¬≠pass the bis¬≠maleimides in terms of tem¬≠per¬≠a¬≠ture resis¬≠tance; work¬≠ing ranges up to 300¬įC are pos¬≠si¬≠ble. Some of the raw mate¬≠ri¬≠als from which poly¬≠imides are made are tox¬≠ic, so that their pro¬≠cess¬≠ing by hand is not rec¬≠om¬≠mend¬≠ed. Pro¬≠cess¬≠ing is com¬≠pli¬≠cat¬≠ed any¬≠way, as water is released dur¬≠ing cur¬≠ing, and the strength of these resins is not very high. Their appli¬≠ca¬≠tion is lim¬≠it¬≠ed to mil¬≠i¬≠tary com¬≠po¬≠nents on mis¬≠siles and aircraft.


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