FEP & PFA Glass Backed Laminates

FEP & PFA Belts are increasingly popular due to their nature & their inertness.

FEP & PFA Glass Backed Laminates

Often used for Production Belts

glass-backed-fepThis remarkable material combines the proven chemical resistance properties of FEP or PFA film with a glass backed cloth which is formed into one homogeneous entity.

This almost indestructible material is free from any fillers or binders. It is inert to virtually all chemicals and solvents and offers a surface which is the ultimate in non-stick.

The knitted glass cloth backing is designed to allow bonding to almost any substrate or overwrapping with GRP. The glass cloth will accept epoxy polyesters, thermosetting resins and some general purpose adhesives so long-lasting bonds are easily achieved Laminate Construction

Since FEP and PFA are stress-crack resistant and the glass cloth is multi-directional, thermoforming is possible.

Holscot Fluoropolymers has used these materials extensively in vessel and tank lining projects. Indeed, we were the first company to complete a column glass backed FEP reinforced by GRP. We can supply dished ends and custom forming’s if required or advise on all aspects of thermoforming.

Sheets are typically 1150 mm wide or 1220 mm wide. Thicknesses are standard at 2.3mm thick polymer plus the thickness of the glass backing but other thicknesses are available up to 6mm.

Fluoropolymer-film-and-sheetThicknesses from 0.01mm to 2.4mm (0.001″ to 0.090″)

  • Excellent thermal stability: Usable throughout a wide thermal range -200 to +200°C (-328 to +392°F)
  • Chemical Inertness: Resists almost all chemicals, such as strong acid, strong alkali, salt, and organic solvent.
  • Anti-stick property: The lowest surface energy of all Fluoropolymer films; displays excellent mould release and anti-stick properties.
  • Electrical reliability: High electrical insulation characterised by low-dialectic constant and dissipation factor and by high dialectic strength over a wide range of temperature and frequency.
  • Resistance to weathering: Inert to outdoor exposure; with unchanged mechanical and physical properties after 10 years.
  • Non-flammability: Will not burn in air or gas having an oxygen concentration of less than 95%.
  • High transparency: Transparent, with an excellent transmission of ultraviolet rays and visible rays; lowest refractive index of all Fluoropolymer films; characterised by very low light reflection.

Standard Specifications of FEP Film

Thickness Size and Weight of Roll
mm inches Width (mm) Length (m) Weight (kg) approx…
0.025 0.001 1150 or 1220 200 or 183 13
0.05 0.002 1150 or 1220 200 or 183 25
0.1 0.004 1150 100 25
0.25 0.010 1250 80 50
0.5 0.020 1250 40 50
1.0 0.040 1250 20 50
1.5 0.060 1250 25 100
2.4 0.090 1250 15 100

Also available:

  • Surface treatment for bonding applications.(sizes from 0.025mm to 0.1mm treated by corona discharge, larger sizes chemically etched)
  • Pigmented films available for specialist applications (e.g. release film) red, white, black, chromed.
  • Perforated films available for release film applications.
  • Standard widths are 1150mm or 1250mm depending on thickness, larger sheets can be supplied by use of Holscot’s welding techniques which provide a virtually indiscernible joint.
  • Other thicknesses available upon request.

Holscot Production FEP and ETFE Film

Holscot is now producing FEP film in gauges up to 1.5mm and widths up to 1180mm. This means that we now have individual flexibility in producing the product that you require at the right price. Some thinner gauge films can also be produced in ETFE for particular use in architectural structures. For more details of this application visit the section on Archtectural.

PFA Film

Holscot can supply PFA in a similar range to FEP film but also in thicknesses up to 6mm. Quotations on request

FEP Film Properties

Property Value Units Method
Physical Properties
Specific Gravity 2.15 ASTM D1505
Tensile Strength (machine direction) 290 Kg/cm2
Tensile Strength (transverse direction) 275 Kg/cm2
Elongation (machine direction) 350 %
Elongation (transverse direction) 360 %
Bending Resistance >100,000 cycles
Co-efficient of friction (static) (to steel ball) 0.1-0.4 Bauden-Rebens
Contact Angle (water) 110-115 degrees
Optical Properties
Transmittance (wavelength 0.2 to 3) 95 %
Refractive Index 1338 N25
Thermal Properties
Melting Point 270 °C
Lowest temp of thermal decomposition 420 °C 10°C/min temp rise
Specific heat 0.28 Cal/g.cm
Co-efficient of thermal conductivity 6×10-4 Cal/sec °C.cm ASTM C177
Co-efficient of linear expansion 8.3-10.5×10-5 1/°C ASTM D696
Heat Shrinkage Rate (machine direction) -0.4 % 0.005mm 30 min at 150°C
Heat Shrinkage Rate (transverse direction) +0.3 % 0.005mm 30 min at 150°C
Electrical Properties
Dielectric Constant 103 – 109Hz (22°-2°C) 2.05 ASTM D150
Dissipation Factor 103 Hz (22°-2°C) <0.0002 ASTM D150
Dissipation Factor 106 Hz (22°-2°C) 0.0004 ASTM D150
Dissipation Factor 103 Hz (22°-2°C) 0.0015 ASTM D150
Volume Resistivity (22°C) 1018 Ohm-cm ASTM D257
Dielectric strength 13 Kv/100microns ASTM D149
N2 Gas 120×10-10 Cm3.cm/cm2.sec.atm ASTM D1434
O2 Gas 370×10-10 Cm3.cm/cm2.sec.atm ASTM D1434
H2 Gas 1080×10-10 Cm3.cm/cm2.sec.atm ASTM D1434
CO2 Gas 970×10-10 Cm3.cm/cm2.sec.atm ASTM D1434
CH4 Vapours 66×10-10 Cm3.cm/cm2.sec.atm ASTM D1434
Ethylene Vapours 44×10-10 Cm3.cm/cm2.sec.atm ASTM D1434
Moisture Permeability 1.6 g/m2. 24hrs
Water absorption <0.01 %, 24hrs ASTM D570
Critical Oxygen Index >95 % by vol.
Water, moisture Excellent
Sunlight, ultraviolet rays Excellent

These values are typical performance data, not intended to be used as design data

Custom Belts in Fluoropolymer

Holscot has carried out extensive development in the production of continuous belts using fabric backed fluoropolymers – both FEP and PFA. The strength of the fabric provides stability whilst the FEP and PFA offers the properties of Non Stick and Chemical Resistance. The belts are formed using Holscot’s machine welding technology which provides a smooth seam at the joint which will ensure the end product is not marked.

Our installation teams can travel worldwide to carry out the final closing seam on site.

FEP Release Film for Carbon Fibre Lamination lay up

During the lay up process of carbon fibre lamination, a thin gauge film must be used to prevent the vacuum bagging components adhering to the uncured laminate. Because of the high temperature of the curing process, the film needs not only to be anti adherent but also resistant to elevated temperature. FEP fulfils this criteria and is used in its thinnest gauges (25 and 50 micron). In some cases, visibility of the film is a necessity so pigmented FEP is used (white or red).