Engineering plastics & insulation materials
Fibre Composites – GFRP, CFRP and Laminates
Lightweight, high-strength carbon or glass fibre parts and heat-resistant insulating laminates – by Murtfeldt and DoTherm.
- Fibres (Murtfeldt): carbon, glass, aramid, basalt, natural fibres
- Processes: filament winding, prepreg autoclave, liquid impregnation
- DOGLAS (GFRP): continuous temperature 155–300 °C depending on grade
- DOGLAS 155, 230 R, 240, 280: UL 94 V0; DOGLAS 250 M: CTI 600
- DOTEX: phenolic resin with cotton or paper fabric, up to approx. 120 °C
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Overview: Fibre Composites
Fibre composites consist of fibres that provide strength and stiffness and a matrix that embeds and protects the fibres and distributes the load. The result is parts with high strength at low weight that resist corrosion and can be tailored to mechanical, thermal and chemical requirements. Murtfeldt makes them to customer specification from carbon, glass, aramid, basalt or natural fibres with epoxy, UP or phenolic resin or a thermoplastic matrix – by filament winding, prepreg autoclave moulding or liquid impregnation, including milling, bonding and assembly.
For parts under thermal and electrical stress, DoTherm, now part of the MOESCHTER Group, supplies thermoset laminates: DOGLAS is a glass fibre reinforced plastic (GFRP) made from glass fabric, roving fabric or mats, combined with resin systems such as polyester or epoxy, rated for continuous use up to 300 °C depending on grade. DOTEX is a phenolic resin composite with cotton or paper fabric for up to about 120 °C. Both are supplied as semi-finished products and parts to drawing.
FAQ: Fibre Composites
What is the difference between GFRP and CFRP?
GFRP is reinforced with glass fibres, CFRP with carbon fibres. The fibre largely determines the mechanical, thermal and chemical properties of the composite, while the matrix governs aspects such as temperature and chemical resistance. Murtfeldt uses CFRP, for example, as a tube in hybrid conveyor screws for greater stability. For insulating parts, DoTherm offers DOGLAS GFRP laminates combining good electrical insulation with low thermal conductivity.
How heat-resistant are DoTherm GFRP laminates?
According to DoTherm, the DOGLAS grades cover continuous temperatures from 155 °C to 300 °C and, depending on grade, up to 320 °C for short periods. DOGLAS 200 LC is designed for particularly low thermal conductivity of 0.13 W/mK, DOGLAS 250 M for very good electrical insulation with CTI 600. The values were measured on standard test specimens and may differ on the finished part depending on geometry.
Which manufacturing processes are used for composite parts?
Murtfeldt names three processes. In filament winding, fibres are laid precisely onto rotating cores, for light, highly loadable parts. In prepreg autoclave moulding, pre-impregnated fibres cure under pressure and heat into parts with high strength and a clean surface. Liquid impregnation soaks dry fibres with resin and makes complex parts cost-effective. Parts are then milled, bonded, finished and assembled.
What is the phenolic composite DOTEX used for?
DOTEX is a thermoset composite of phenolic resin with cotton or paper fabric. DoTherm cites good mechanical strength, good friction and sliding properties, excellent insulating and damping behaviour and outstanding machinability at temperatures up to about 120 °C. According to DoTherm, it covers many requirements in industrial plants cost-effectively; DOTEX 110 with cotton fabric is available as sheet and as tube.
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