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Basic products

  • PREFEN COMPOSITE PROFILES
  • COMPOSITE GRATINGS
  • COMPOSITE COVERS

Structures

  • COMPOSITE RAILINGS
  • WALL-MOUNTED AND FREE-STANDING COMPOSITE LADDERS
  • CABLE RUNS
  • COMPOSITE FOOTBRIDGES
  • COMPOSITE STAIRCASES
  • WATERWORKS STRUCTURES
  • ENERGY INDUSTRY PRODUCTS

OTHERS

  • LAMINATED PRODUCTS
  • Composite ballistic protection plates
  • PREFAPREG SMC
  • PRESSING
  • PREFA REBAR COMPOSITE REINFORCEMENT
  • custom products
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  • Waterworks
  • Chemistry
  • Roads and Bridges
  • Railways
  • Energy Industry
  • Piers and Docks
  • Structural Reinforcement
  • Civic Construction
  • Windows and Doors
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 COMPANY NAME AND ADDRESS

 

PREFA KOMPOZITY, a.s., Kulkova 10/4231, 615 00 Brno, Czech Republic

The Company’s business registration number (IČ) is 26949881,

its VAT registration number (DIČ) is CZ26949881.

It is entered into the Commercial Registry of the Regional Court of Brno, File B-4276.

Tel.: +420 541 583 297, +420 541 583 208

email: kompozity@pre­fa.cz

 

 MANUFACTURING PLANT AND WAREHOUSE

 

Havránkova 11, 619 00 Brno – Dolní Heršpice, Czech Republic

 

 COMPANY MANAGEMENT

 

Chairman of the Board

Ing. Miloš Filip • tel.: +420 541 583 292 • filip@prefa.cz

Director of the company

Ing. Pavel Stryk • tel.: +420 541 583 208, +420 728 082 107 • stryk@prefa.cz

 

 TECHNOLOGY AND SALES

 

Sales manager

Ing. Marek Šlapanský • tel.: +420 541 583 297, +420 606 610 178 • slapansky@pre­fa.cz

Sales assistant

Petra Stryková • tel.: +420 606 076 043 • strykova@pre­fa.cz

Project and technology manager

Ing. Michal Došlík • tel.: +420 541 583 241, +420 734 755 956 • doslik@prefa.cz
 

 DEVELOPMENT AND INNOVATION DIVISION

 

Director of Development and innovation division

Ing. Jan Prokeš, Ph.D. • tel.: +420 724 054 563 • prokes@prefa.cz

Development technician

Ing. Ondřej Sedláček • tel.: +420 724 954 756 • sedlacek@prefa.cz

Development technician

Ing. Ondřej Bezděk • tel.: +420 720 669 848 • bezdek@prefa.cz
 

 PRODUCTION

 

Director of manufacturing plant and warehouse

Ing. Jiří Bechný • tel.: +420 543 521 419, +420 602 510 758 • bechny@prefa.cz

 

 

Contact us:

Fields marked with * are required
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Product certificates

Profiles PREFEN  PDF
Gratings PREFAGRID and PREFAPOR   PDF
Covers PREFAPLATE PDF
Railings PREFASAF PDF
Ladder PREFALAD PDF
Composite reinforcement PREFACARB (cz) PDF
Reinforcing rods PREFA REBAR (cz) PDF

Declaration of conformity / Declaration of performance

Profiles PREFEN (DoC) PDF
Gratings PREFAGRID a PREFAPOR (DoC) PDF
Covers PREFAPLATE (DoC) PDF
Railings PREFASAF (DoC) PDF
Ladders PREFALAD (DoC) PDF
Shaft ladders PREFALAD (DoP) PDF
Composite reinforcement PREFACARB (DoP – cz) PDF
Reinforcing rods PREFA REBAR (DoC – cz) PDF

Assessment

Fire interaction class C-s2, d0, construction products (cz)  PDF
Fire interaction class B fl-s1, flooring materials (cz) PDF
Antistatic (cz) PDF
PREFEN – surface resistance PDF
Statement of the Mining Office (cz) PDF
Reference list – Utility  tunnel (cz) JPG
Thermal conductivity (cz) PDF
Anti-slip properties (cz) PDF
Contact with drinking water PDF
Insulating properties of ladders (cz) PDF

ISO Certificate

Certificate ISO 9001:2016 PDF
Certificate ISO 14001:2016 PDF

Catalogs

Product catalog 2019 PDF
Railings and covers (cz) PDF
Leaflet covers PDF
FRP concrete reinforcement (cz) PDF
Leaflet PREFACARB (cz) PDF
Leaflet PREFEN 600HT (cz) PDF
Leaflet SMC PREFAPREG (cz) PDF
Profiles dimensioning (cz) PDF
Key features of PREFEN profiles (cz)  PDF

Program PREFEN

Calculation tables for PREFEN profiles (in Czech l.)  XLS format

 

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MANUFACTURE AND ASSEMBLY OF COMPOSITE MATERIALS AND STRUCTURES

WE MAKE YOUR LOAD LIGHTER…

PREFA KOMPOZITY • Brno • Czech Republic

Production technology

WHAT ARE COMPOSITE MATERIALS?

Generally speaking, a composite is any material consisting of at least two principal components with significantly different physical properties. PREFA KOMPOZITY manufactures composite materials consisting of a binder matrix and fiber reinforcement. Most of our materials use organic polymer resins as the matrix and glass fiber as reinforcement; that is, they are fiber-reinforced plastics. Our fiber-reinforced plastics are sold under the trade name PREFEN.

Aside from production technology, the key parameters determining the properties of composite materials are:

Matrix type

  • Polyester the most common resin type, frequently used in construction
  • Vinylester – more demanding applications, including chemically corrosive environments and high mechanical and thermal load
  • Epoxide – applications most demanding on mechanical and electrical properties and chemical stability

Reinforcing fiber type

  • Glass – standard mechanical properties
  • Carbon – high elastic modulus and high dynamic load applications
  • Other fibers (principally aramid and basalt) for specific applications

Admixtures

The matrix resin may include a variety of admixtures to improve the properties of the resulting material; these include e.g. fire-retardants, UV stabilizers, electrical conductivity enhancers, etc.

Subsurface veil

An often underappreciated feature of composite materials, the veil enhances the product’s appearance and has a variety of practical functions; it is particularly essential in chemically corrosive environments and UV-intensive applications.

TECHNOLOGIES USED BY PREFA KOMPOZITY:

  • Pultrusion – opened and closed profiles, rods, plates, spiral-wound rods
  • Winding – round tubes
  • Molding – PREFAGRID walk-over and load-bearing gratings
  • Manual lamination – cover surfaces and edges, custom products
  • SMC – semiproduct for pressed products, manhole covers

PULTRUSION TECHNOLOGY

Pultrusion is a process for the continuous production of reinforced resins of varied shapes and lengths by pultrusion. The input material is a mix of liquid resin and reinforcing fiber. The material is machinedrawn over a heated steel mold.

The reinforcing material – usually glass fiber – is input as rovings and mats. Rovings, which are spools of wound fiber, are loaded into the rectifier, which distributes the rovings evenly throughout the workpiece cross-section and aligns the position of the mats.

All PREFEN profiles except solid bars have a thin subsurface polyester veil, saturated in resin. This serves to confine the reinforcing fibers to the interior of the piece and improves the chemical and UV resistance of the material, as well as its appearance. In the event of damage, the veil prevents the fibers from protruding out.

The next machine in the line soaks the fiber, mat, and veil in a liquid mix of resin, filler, coloring, catalyst, and optionally further admixtures to improve the material’s physical properties.

 

Once out of the bath, the workpiece has the general shape of the final product. It then enters another rectifier, which presses out excess resin and further shapes the piece, which is then passed to the hardening mold.

The heated mold is where the thermosetic reaction takes place and the piece hardens.

The finished material is machine-drawn out of the mold and cut into bars of required length – usually 6,000 mm.

 

Moulding

is used for production of molded gratings PREFAGRID.

HEIGHT
14 mm 20 mm and 25 mm 30 mm 38 mm 50 mm 60 mm
prefagrid1 prefagrid2 prefagrid3 prefagrid4 prefagrid5 prefagrid6

Gratings in form of a square grid pattern are produced from polyester resin reinforced only with unidirectional rovings (without mats and subsurfacing veils in contrast to the assembled, bar-type gratings).

After filling, the mold is heated and the chemical reaction completely cures the product, which is then demolded and after processing is ready for further use.

The walking surface is provided with an anti-skid layer consisting of quartz sand embedded into epoxide resin.

Molded grating is edge bearing and can rest on all four sides. This is an asset as far as the structural rigidity is concerned.

PREFAGRID gratings are produced in large plates, which are then divided according to customer requirements. The plates have different maximum dimensions. The largest dimension is 1,220 x 4,660 mm. However, in specific cases it is necessary to check their availability with our sales representatives.

Manual lamination

Lamination technology types:

  • Pressing
  • Manual lamination
  • Spraying (may be combined with manual lamination)

Chimney extension assembly
A chimney hood made by manual lamination
Restoration of the hull - combination of spraying and manual lamination
A chimney segment being made by spraying
Manualy laminated custom product
Part of laminated shower enclosure

Manual lamination

Manual lamination consists of adding successive layers of resin and fiber into a mold. The matrix is usually polyester resin; the reinforcing fiber is glass, mainly mats, optionally with rovings. 

We use manual lamination to manufacture all cover surfaces and edges; complex shapes are also possible. This method allows affordable production of small orders that would otherwise suffer from machinery setup costs.

Sprayed products

Spraying consists of using a spraying machine to deposit a mix of resin and short glass fibers into a mold or directly onto a surface. This method requires a degree of skill and experience in spraying, preparing the surface to be sprayed, and preparing the liquid material.

We primarily use spraying to manufacture bulky parts and to repair damaged surfaces of other materials (mainly concrete and metal).

PRESSING

In molding technology, SMC (Sheet Molding Compound), BMC (Bulk Molding Compound) and prepregs are used. These materials are sized and placed in a mold where they are formed into the desired shape by heat and pressure and then cured.

A DN600 manhole cover being pressed

Our pressing machine specifications:

  • Pressing table surface 1,120 x 1,320 mm
  • Maximum pressing force 1,000 tons
  • Hardening temperatures up to 200 degrees Celsius

BMC

BMC (Bulk Molding Compound) is a composite material consisting mainly of thermosetting resin (most often polyester) and fiberglass (length <25 mm). BMC is used primarily for the production of products by pressing or injection molding, which is then formed into the desired shape and cured under heat and pressure.

BMC materials are widely used in the construction, wiring and automotive industries. BMC is also applied in industry, services, households and medicine.

BMC production

BMC is a polymer composite material that is made by mixing chopped glass fibers with a thermosetting resin and mineral fillers. The resins used are most commonly unsaturated polyester or vinyl ester resins. Thermoplastic additives, catalysts, inhibitors, separators, thickeners and pigments are used to improve the final properties of the product and molding process.

GLUES PRODUCTION

Generally, two-component chemically cured binder systems based on acrylic, polyester or epoxy resins are used.

Construction two-component glues
Construction two-component glues
Construction two-component glues - sold in tubes or foil

Our production equipment is capable of filling rigid cartridges or plastic foil packaging with one- or two-component materials.

PREFEN – product characteristics

PREFEN 505

resin isophthalic polyester
standard color light grey
UV stabilizer included
application general use

PREFEN 525

resin isophthalic polyester with fire interaction class B
standard color light grey
UV stabilizer included
application generally for reduced flammability

PREFEN 535

resin isophthalic polyester with fire interaction class A
standard color light grey
UV stabilizer included
application generally for reduced flammability

PREFEN 536

resin isophthalic polyester with fire interaction class A
standard color dark grey
UV stabilizer excluded
electrostatics included
application generally for reduced flammability and avoidance of static electricity

PREFEN 605

resin vinyl ester
standard color grey
UV stabilizer included
application structions in highly corrosive environment

PREFEN 625

resin vinyl ester with fire interaction class B
standard color grey
UV stabilizer included
application energy industry products

PREFEN 700

resin epoxy with carbon fiber
standard color black
UV stabilizer excluded
application reinforcement of concrete structures and foundations

KEY FEATURES OF PREFEN PROFILES

PREFEN structural composite pultruded profiles offer many advantages:

  • Low weight
    Easy and safe handling – up to 4 times lighter than steel (nominal density 1,800 Kg/m³)
  • Flexible
    Unlike metals, composite does not permanently deform when subjected to impact or overload
  • Chemically stable
    Composites are highly resistant against a variety of chemicals, do not corrode in air, and do not require painting or other protective finishing
  • Electrically non-conductive
    Composite structures do not need grounding and are suitable for applications with electrocution, lightning, and wandering current risks
  • Easy machining
    Composites are easy to machine, with a cutting resistance on par with hardwood. Furthermore, composite machining does not create the hazardous sharp edges and splinters produced by steel. 
  • UV resistant
    Ultraviolet radiation is a natural component of sunlight and generally tends to degrade organic materials. PREFEN composites feature three-level UV protection: The resin includes UV stabilizing agents, the subsurface polyester veil absorbs some UV, and structures for high-exposure applications are painted with polyurethane to prevent long-term discoloration.
  • High service life
    The useful service life of composite materials depends on a variety of factors, the most important of which are aggressive chemicals, weather conditions (temperature, humidity, subzero conditions), UV exposure, and high-temperature environments. Our technology department will review your requirements and propose a suitable material solution. Assuming operational requirements are met, composite materials generally last for the lifetime of the structure.
  • Hygienically safe
    PREFEN is officially attested safe for immersion in potable water.
  • Excellent mechanical strength
    Tensile strength from 240 to 1,000 MPa with glass fiber; up to 3,000 MPa with carbon fiber
  • Fire-retardant
    Thanks to fire-retardant admixtures, we can supply materials with fire interaction class (pursuant to ČSN EN 13501-1) Bfl – s1 for flooring materials; C – s2, d0 for other materials.
  • Nominal thermal conductivity
    As low as 0,19 W.m-1.K-1 in materials with thermal bridge suppression requirements
  • Sustained thermal resistance
    Between 100 and 180 °C, depending on resin type 
  • Surface resistivity
    Standard materials on the order of 1012 Ohm; upon request as low as 106 Ohm
PREFA KOMPOZITY a.s. - Logo

Products

  • PREFEN COMPOSITE PROFILES
  • COMPOSITE GRATINGS
  • COMPOSITE COVERS
  • COMPOSITE RAILINGS
  • WALL-MOUNTED AND FREE-STANDING COMPOSITE LADDERS
  • CABLE RUNS
  • COMPOSITE FOOTBRIDGES
  • COMPOSITE STAIRCASES
  • WATERWORKS STRUCTURES
  • ENERGY INDUSTRY PRODUCTS
  • LAMINATED PRODUCTS
  • Composite ballistic protection plates
  • PREFAPREG SMC
  • PRESSING
  • PREFA REBAR COMPOSITE REINFORCEMENT
  • custom products

Reference Orders

  • Waterworks
  • Chemistry
  • Roads and Bridges
  • Railways
  • Energy Industry
  • Piers and Docks
  • Structural Reinforcement
  • Civic Construction
  • Windows and Doors

Technology

  • WHAT ARE COMPOSITE MATERIALS?
  • PULTRUSION TECHNOLOGY
  • Moulding
  • Manual lamination
  • PRESSING
  • BMC
  • GLUES PRODUCTION
  • PREFEN – product characteristics
  • KEY FEATURES

Development and Innovation

  • Development and Innovation

About the Company

  • Company characteristics

PREFA KOMPOZITY, a.s.

kompozity@prefa.cz
Company name: PREFA KOMPOZITY, a.s.
Address: Kulkova 10, 615 00 BRNO, CZ
Phone: +420 541 583 297, +420 541 583 208
E-mail: kompozity@prefa.cz
Registration number: CZ 26949881
© 2019 Prefa Kompozity a.s., subsidiary company of Prefa Brno a.s.
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