October 1990 Additives for Polvmers Epoxy filler for boats Core material for GFW structures Carbon fibres Glass reinforced nylons specially developed chlorinated alicyclic hydrocarbon. This combination has a high temperature resistance, (up to 3OOOC) and good electrical properties. A new two-part epoxy filler is available from International Paint’s Yacht Division, for profiling on wood and metal hulls and in osmosis treatment of GFW hulls. Known as Inter-fill830, it replaces Interfill 500 at the same price but with a number of benefits. It has an SG of only 0.74, compared with 1.00 for the earlier formulation, and is easier to sand, with smaller microspheres which enable a finer finish to be achieved. Depths up to 2 cm can be filled without sagging, the company says. Impag Great Britain has introduced a new core material for the production of light weight GRP structures. Called Spheretex, the material is a combination of hollow microspheres with reinforcing fibre. This can be in a woven, continuous form or as a random chopped strand mat. Future grades may use aramid or carbon fibres, says the firm. Typically, resin absorption is 40% lower than conventional cores which do not contain microspheres. Additionally, the presence of microspheres reduces the density, and so specific weight, by up to 50% compared to conventional materials. RK Carbon will shortly commence production of a 23,000 filament count commercial grade carbon fibre, which it says will offer cost savings of up to 25% compared with 6,000 and 12,000 filament fibres. Designated KK 20K the new grade is produced from a much cheaper, and more readily available, acrylic precursor than the specialised precursors normally used. Atochem has added two long-fibre reinforced grades to the Rilsan nylon range, which it says are suitable for thinner and lighter injection moulded engineering components. Key properties of mouldings, compared with standard fibre-length reinforced grades, are impact resistance up by around 200%, improved dimensional stability and abrasion resistance, reduced moisture absorption, and improved surface finish. Designated MA 4505 FL and MA 4506 FL, they contain 30 and 50% of long fibres respectively, and are supplied as 15 mm long granules. Universal masterbatches Universal colour masterbatches have been introduced by Colourfast in the UK. Based on a multi-component carrier said to obviate the possibility of degradation of the physical 01990 Elsevier Science Publishers Ltd. 11

Core material for GRP structures

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Page 1: Core material for GRP structures

October 1990 Additives for Polvmers

Epoxy filler for boats

Core material for GFW structures

Carbon fibres

Glass reinforced nylons

specially developed chlorinated alicyclic hydrocarbon. This combination has a high temperature resistance, (up to 3OOOC) and good electrical properties.

A new two-part epoxy filler is available from International Paint’s Yacht Division, for profiling on wood and metal hulls and in osmosis treatment of GFW hulls. Known as Inter-fill 830, it replaces Interfill 500 at the same price but with a number of benefits. It has an SG of only 0.74, compared with 1.00 for the earlier formulation, and is easier to sand, with smaller microspheres which enable a finer finish to be achieved. Depths up to 2 cm can be filled without sagging, the company says.

Impag Great Britain has introduced a new core material for the production of light weight GRP structures.

Called Spheretex, the material is a combination of hollow microspheres with reinforcing fibre. This can be in a woven, continuous form or as a random chopped strand mat. Future grades may use aramid or carbon fibres, says the firm.

Typically, resin absorption is 40% lower than conventional cores which do not contain microspheres. Additionally, the presence of microspheres reduces the density, and so specific weight, by up to 50% compared to conventional materials.

RK Carbon will shortly commence production of a 23,000 filament count commercial grade carbon fibre, which it says will offer cost savings of up to 25% compared with 6,000 and 12,000 filament fibres.

Designated KK 20K the new grade is produced from a much cheaper, and more readily available, acrylic precursor than the specialised precursors normally used.

Atochem has added two long-fibre reinforced grades to the Rilsan nylon range, which it says are suitable for thinner and lighter injection moulded engineering components. Key properties of mouldings, compared with standard fibre-length reinforced grades, are impact resistance up by around 200%, improved dimensional stability and abrasion resistance, reduced moisture absorption, and improved surface finish.

Designated MA 4505 FL and MA 4506 FL, they contain 30 and 50% of long fibres respectively, and are supplied as 15 mm long granules.

Universal masterbatches Universal colour masterbatches have been introduced by Colourfast in the UK. Based on a multi-component carrier said to obviate the possibility of degradation of the physical

01990 Elsevier Science Publishers Ltd. 11