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Core materials

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Gurit® – Core materials

Gurit is a leading company in core material development and manufacturing. Core materials in a sandwich structure make the composite stiffer and lightweight. Gurit’s versatile product range includes suitable core material regardless of the specifications and manufacturing processes. Core materials are available in plain or contour scrim.

Ideal storage temperature is 10 – 30 ºC and relative humidity under 70 %. Should not be exposed to direct sunlight.

 

PH-PLAIN    PH – PLAIN / perforated VIC CUT – vacuum infusion

 

Cuttings

Typically composite structures are not plain, so the core materials should bend. This can be achieved by thermoforming or axial cuts. For example, the cuts improves air removal and spreading of the resin.

 

SC – Single CUT     DC – Double CUT     CS – Contour Scrim

 

 

Thermoforming

In thermoforming processes the sheets are bent into demanded shapes. Gurit’s Corecell and PVC are thermoformable core materials. Recommended processing temperatures for each product are provided in the table below.

Process:

1. Warming

2. Forming

3. Postforming

Type  Product Recommended thermoforming temperature (ºC) Maximum thermoforming temperature  (ºC)
Gurit® Corecell™ SAN
(styrene acrylic nitrile)
M 110 120
Gurit® PVC
(polyvinyl chloride)
PVC 120 135
PVC HT 140 155

 

Hand lamination and infusion

All core materials are porous. The lower density and larger cell structure, the more resin is consumed. High resin consumption is also dependent on the manufacturing technique.

 

Prepreg/Sprint

Each core material type has a maximum temperature, where after their mechanical properties weaken.

 

Type  Product Normal processing temperature limit
Gurit® Corecell™ SAN
(styrene acrylic nitrile)
M 120 ºC in 1 h
Gurit® PVC
(polyvinyl chloride)
PVC not recommended for prepreg processes
PVC HT 120 ºC in 1 h

 

Core Brochure    Structural core processing guide

 

Gurit® Corecell™

Corecell core material was developed to account for the inadequacies of PVC foam. SAN-based (styrene-acrylonitrile) foams are the forerunning core materials due to their natural toughness and ductility compared to e.g. PVC or other vinylester-based core materials. Corecell core materials are characterized by low creep, good impact resistance, good impact strength, heat resistant, and hydrostatic pressure resistant. Corecell is the optimal solution especially for demanding structured layer applications. Corecell’s is temperature resistant up to 120 °C; depending on the quality.

Corecell is suitable for use with polyester, vinylester, and epoxy; however, compatibility testing is recommended before applicably utilized.

Corecell is approved by Lloyds, DNV GL, and ABS.

CorecellTM M-Foam is a new generation of Corecell. It is suitable for all composite processing and prepreg applications due to it’s high heat resistance and can be used to replace PVC foams.

Type M60 M80 M100 M130 M200
Density (kg/m3) 65 85 107,5 140 200
Color green blue/yellow black light brown brown
Panel size (mm) 1085×2606 1220×2240 1130×2275 1015×2045 1839×915
Panel thickness (mm) 5 – 38 5 – 38 5 – 32 5 – 32 5 – 30

Products ordered upon request. Panel inventory subject to change.

 

Gurit® PVC

NEW! Kevra offers its customers PVC foam manufactured in Europe. Nowadays, PVC core material is one of the basic raw materials used for manufacturing and mending of boats.

Gurit® PVC is a closed cell, cross-linked PVC foam. It provides superior strength to
weight ratio for all composite applications.

Other key features of Gurit® PVC include outstanding chemical resistance, negligible
water absorption, and excellent thermal insulation capabilities. It is compatible with
most common resin systems including epoxy, polyester and vinylester.

The product is approved by DNV.

 

 

Type / straight PVC 40* PVC 60 PVC 80 PVC 100* Others*
Density (kg/m3) 40 60 80 100
Color code light blue yellow green red
Sheet size (mm) 1330 x 2850 1150 x 2450 1020 x 2180 950 x 2050
Thickness (mm) 5, 10, 15, 20 3 – 50 10, 15, 20 5, 10, 15, 20

 

Type / contour scrim PVC 40* PVC 60 PVC 80 PVC 100* Others*
Density (kg/m3) 40 60 80 100
Color code light blue yellow green red
Sheet size (mm) 945 x 1130 1150 x 1220 1020 x 1080 950 x 1020
Thickness (mm) 5, 10, 15, 20 3 – 50 10, 15, 20 5, 10, 15, 20
*available in full packs on request

Also single PVC sheets are available from our stock, as well as sheets with other densities and different rutting and perforating (full boxes). Available upon request.

 

Chem Trends Hexcel EurocarbonUnited FoamMitsubishidiatex tfp

Kevra Oy
Ylästöntie 121 A
01740 Vantaa
General purchasing terms

tel. (09) 612 6820
kevra@kevra.fi

Open mon-fri 9-16

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