Frequently asked question about pvdf
9
PVDF (Polyvinylidene Fluoride) What is the minimum and maximum use temperature for PVDF Industrial Pressure Piping? Under supported conditions and using a chemical compatibility chart, PVDF can be used continuously up to 150C and most manufacturers rate it to 140C in chemicals that have little attack on PVDF. As it relates to cold weather, PVDF is not brittle until ‐40C, but most recommendations are to use ‐30C as the lower limit in case there is some type of impact that occurs on the system. Flexible PVDF copolymers generally do better at very low temperatures compared to PVDF homopolymers but they can all handle relatively cold weather.
-
Upload
hudi-leksono -
Category
Business
-
view
137 -
download
1
description
Transcript of Frequently asked question about pvdf
PVDF (Polyvinylidene Fluoride)What is the minimum and maximum use temperature for PVDF IndustrialPressure Piping?
Under supported conditions and using a chemical compatibility chart, PVDF canbe used continuously up to 150C and most manufacturers rate it to 140C inchemicals that have little attack on PVDF. As it relates to cold weather, PVDF isnot brittle until ‐40C, but most recommendations are to use ‐30C as the lowerlimit in case there is some type of impact that occurs on the system. FlexiblePVDF copolymers generally do better at very low temperatures compared toPVDF homopolymers but they can all handle relatively cold weather.
What are the most common chemicals handled byPVDF that attack less expensive materials?
It is common to use PVDF piping to handle hotChlorine, Methyl Chloroform, Hydrochloric Acid, SaltWater, Chlorobenzene, Sodium Hypochlorite (pH < 12),Sugars, Sulfuric Acid (97 % and less), Chlorinated Salts,Phosphoric Acid, Hydrofluoric Acid, Metallic Chlorides,Acid Mixtures, Bromine, Hydrobromic Acid, Bromo‐benzene, Brominated Salts, Iodine, Salicylic Acid,Methane Sulfonic Acid, Acetic Acid (<50%), MethylAlcohol, Chromic Acid, Nitric Acid, Deionized Water,Ozone, Biodiesel, Bioethanol, Hydrocarbon and alcoholbased fuels and mixtures.
Can PVDF piping be steamcleaned?
Studies have beenpublished that after over 50steam cycles at 127C, PVDFpiping had no change inproperties versus a controlsample. It is common tosubject PVDF piping to lowpressure steam in bio–pharma applications.
What joining methods are readily availablefor PVDF piping systems?
Generally PVDF pipe is joined eithermechanically or by fusion welding. PVDFsystems are offered by several pipemanufacturers in socket fusion, butt fusion,beadless butt fusion (BCF Bead CreviceFusion), infrared fusion, electrofusion,flanged mechanical, threaded mechanical,fiberglass reinforced flanged, and threaded.
What food and water regulatory listingsare available for PVDF?
Certain grades of PVDF are listed by NSFfor NSF‐51 (hot food contact) and NSF‐61(hot potable water).Certain grades comply with USP Class 6testing.Certain grades comply with Sanitary 3Atesting.Certain grades comply with FDA Title 21CFR 177.2510 and CFR 177.2600 forrepeated use with food contact. Theremay be other listings and it is good to justcontact the manufacturers of PVDF foradvice.
What flame and smoke testing listings are available forPVDF?
Certain grades of PVDF have FM 4910 listing forSemiconductor Facilities. Certain grades of PVDF arelisted to UL 2024 for plenum rated racewayconduits. Certain grades of PVDF are listed to ASTM E8425/50 rating tested in sheet form (one listed producteven has a 0/0 rating), and have achieved a 0/20, 5/40rating tested as pipe geometry with the tunnel full inwidth and length as designed in the test with no additionof water or other potentially extinguishingmedia. Certain grades of PVDF comply with 25/50 ratingfor ULC S102.2. Certain grades of PVDF are used bycompanies that make listed wire and cable products forplenum areas in buildings. PVDF Foams with density aslow as 0.03 specific gravity have passed ASTM E84 25/50rating and have achieved FM 4910 listing. There may beother listings, and it is good to just contact themanufacturer for written confirmation.
Can PVDF pipe be exposed to nuclear radiation?PVDF has been used up to 1000 mega‐rads ofradiation exposure by government laborato‐ries. There is much documentation about the useof PVDF in nuclear reclamation facilities.
What typical industries use PVDF piping tohandle chemical processing?
The following industries use PVDF pipingsystems: Pulp & Paper, Chlor‐Alkali, MetalPreparation, Petrochemical, Food & Beverage,Pharmaceutical /Biotech, Wastewater, Pesticides,Fertilizer, Semiconductor /Electronics, Institutional(Schools, Colleges and Universities), BrominatedChemicals, Marine, and General ChemicalHandling.
What is the abrasion resistance of PVDF?
Reported Tabor Abrasion Resistance shows PVDF tocompare favorably with Nylon and UHMW‐PE. This is over2 times more resistant than many commodity polymersand 100 times more resistant than PTFE.
How resistant to sunlight is PVDF? PVDF is very resistant to sunlight. It is commonly used inSolar Panels as a 40 year life protective film, long life paintfinishes for tall buildings and airports, and outdoor wiringand piping.
What final products are readily available in PVDF tocompliment piping systems? Flexible tubing, fittings,films, coated ducting, pumps, nozzles, flowmeters, valves,tanks, membranes, fabrics, dump tower packing, filterhousings and nuts & bolts are readily available in stock formaking a complete chemical handling system from PVDF.
THANK YOU
