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PTFE COATED GLASS FABRICS (TVT)

General Characteristics

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MEREFSA markets high quality glass and aramid fabric and mesh (PTFE coated glass and aramid fabrics). During the manufacturing process they are coated with PTFE several times to obtain a smooth, uniform thickness, obtaining an inert, non adherent, foodstuff contact apt, and high temperature resistant (up to +270ºC)

As with pure PTFE, PTFE emulsions can be filled with different products to enhance mechanical or electrostatic properties. The most common filler is graphite (antistatic PTFE coated fabric), which provides a better conductivity and occasionally glass and mica fillers for better mechanical properties.

PTFE coated glass fabrics are mostly used as non adherent items in heat sealing applications in packaging industry and thermoforming processes, conveyor belts in processes involving sticky products or high temperatures, such as lining of gliding surfaces, oven cooking sheets for pastry industry and dyeing, printing, silk screen printing in textile industry, etc.

Our maximum width in PTFE coated glass fabrics is 3300 mm, the most common size being 1000 mm in 30 metre length rolls. These rolls can be supplied with a silicone-based adhesive backing up to 1500 mm wide (maximum working temperature +240 º C) or chemically etched for further adhesion. Maximum width for mesh is 3600 mm.

We keep a permanent stock in 0.08 mm – 0.13 mm – 0.16 mm – 0.25 mm thick PTFE coated glass fabrics, with and without adhesive backing. We slit rolls upon request from 3 mm to 1495 mm wide. Also kept in stock are our PTFE coated glass cooking sheets (Qualiflon) and our Silicone coated cooking mats (Qualisil) in several standard sizes. We can supply any size on request.

Upon request we use thse materials to manufacture belts. Depending on the customer's needs, we can supply Alligator, Clipper, Bullnose, Peek, heat-sealed or castellated splice, together with sealed and/or sewn lateral reinforcements.

Technical Data Sheet

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PTFE COATED GLASS FABRICS STANDARD
Propierties Units 0,08 mm 0,13 mm 0,15 mm 0,25 mm
General
Characteristics
Substrate Type Woven Fiberglass
Coating Medium Polytetrafluoroethylene
Operating Temperature ºC -73 ºC / +260ºC
Standard Width (s) mm 1000-1250-1500 1000-1250-1500-2000 1000-1500 1000-1500
Overall Thickness mm 0,075 0,120 0,140 0,235
Coated Weight g/m 150 260 295 485
PTFE Content % 64 58 63 59
Breaking Strength
(w / f)
Nw/5cm 800 / 450 1280 / 1095 1300 / 1200 2250 / 1395
Tear Strength
(w / f)
Kg 0.70 / 0.41 1.70 / 1.00 0.91 / 0.68 2.40 / 1.60
% Elongation
( minimum )
@ break 2.5 / 2.3 3.1 / 3.1 3.0 / 4.0 5.0 / 4.5
Dielectric Strength V / 1000 505 625 1200 750
Adhesion resin to substrate Nw/5cm   22.7 / 21.9 23.7 / 24.9 36.8 / 34.1


MEREFSA reserves the right to alter any of the elements quoted in the above specification without prior notice. Please note that the above information is given in good faith and should be considered as a guide only. Suitability of the product for all applications is at the discretion of the user.

Chemical Resistance Chart

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PTFE coated glass fabrics (TVT)
Chemical Products Pure Carbon Graphite Bronze Glass Fibre
Acetaldehide Excellent Excellent Excellent Excellent
Acetone Excellent Excellent Excellent Excellent
Aluminium Sulphate Excellent Excellent Good Excellent
Ammonium chlorate Excellent Excellent Bad Excellent
Ammonium hidroxide Excellent Excellent Bad Good
Aniline Excellent Excellent Bad Excellent
Benzene Excellent Excellent Excellent Excellent
Boric acid Excellent Excellent Excellent Excellent
Brine Excellent Excellent Excellent Excellent
Bromium (Anhidrous) Excellent Bad Bad Good
Carbon disulphate Excellent Excellent Excellent Excellent
Chloracetic acid Excellent Excellent Good Excellent
Clorobenzene Excellent Excellent Excellent Excellent
Chloroform Excellent Excellent Excellent Excellent
Cromic acid Excellent Good Bad Good
Citric acid Excellent Excellent Excellent Excellent
Diethyl ether Excellent Excellent Excellent Excellent
Ethyleneglycol Excellent Excellent Excellent Excellent
Fatty acids Excellent Excellent Excellent Excellent
Iron chlorate Excellent Excellent Bad Excellent
Iron sulphate Excellent Excellent Bad Excellent
Fluorosilic acid Excellent Good Bad Bad
Formic acid Excellent Excellent Excellent Excellent
Freon (liquid) Excellent Excellent Excellent Excellent
Hydroborid acid Excellent Excellent Bad Good
Hydrochloric acid Excellent Excellent Bad Good
Hydrocianic acid Excellent
Hydrofluoritic acid Excellent Excellent Bad Bad
Acid solution of iron sulphate Excellent Excellent Bad Bad
Maleic acid Excellent Excellent Excellent Excellent
Mercury salts Excellent Excellent Good Excellent
Naphta Excellent Excellent Bad Good
Naphtaline Excellent Excellent Bad Excellent
Nickel salts Excellent Excellent Excellent Excellent
Nitric acid (0-50%) Excellent Excellent Excellent Excellent
Nitrobenzene Excellent Excellent Excellent Excellent
Phenol Excellent Bad Bad Good
Phosphoric acid Excellent Excellent Excellent Excellent
Phtalic acid Excellent Excellent Good Excellent
Picric acid Excellent Excellent Excellent Excellent
Pyridine Excellent Excellent Excellent Excellent
Salicilic acid Excellent Good Bad Good
Silver nitrate Excellent Excellent Excellent Excellent
Sodium carbonate Excellent Excellent Excellent Excellent
Sodium hydroxide Excellent Excellent Excellent Excellent
Sodium nitrate Excellent Excellent Excellent Excellent
Sodium peroxide Excellent Excellent Bad Excellent
Sodium silicate Excellent Excellent Bad Excellent
Sodium sulphat Excellent Good Bad Bad
Sulphuric acid Excellent Excellent Excellent Excellent
Tannic acid Excellent Excellent Bad Good
Tartaric acid Excellent Excellent Bad Good
Trichloroethylene Excellent Excellent Bad Bad
Zinc chlorate Excellent Excellent Bad Bad


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