PVDF piping systems - ideal for special applications

Polyvinylidene fluoride (PVDF) is a thermoplastic fluoropolymer with very high purity, as it is a homopolymer without additives such as stabilizers and dyes. As a result, PVDF is physiologically safe and can be used in ultra-pure media. It also has high mechanical strength and very good chemical resistance. Compared to other fluoroplastics, PVDF can be processed easily and well.

General properties of PVDF:

physiological harmlessness, high purity
temperature resistant from -40° C to 150° C (depending on the type of stress)
good resistance to most inorganic acids, even at high temperatures
good mechanical properties
very good sliding properties, high surface smoothness
excellent abrasion resistance
UV-resistant
good weldability

Application areas of PVDF pipe systems:

Ultra-pure media supply
Chemical plants
Pharmaceutical plants
Semiconductor industry
Food industry
Piping systems
Apparatus engineering
Wet benches
Tank linings

Delivery program:

PVDF pipes
PVDF fittings for butt, IR and HPF welding
PVDF fittings for socket welding
HPF electrofusion couplers
PVDF valves
PVDF semi-finished products
Welding technology

Advantages of using PVDF pipes and fittings:

easy installation due to the use of IR, HPF, butt and socket welding
High-purity (HP) materials fulfils particularly high requirements with ultra-pure media
flame retardant according to UL 94-V0, FM-approved

Pressure table in bar for PVDF pipe systems according to ISO 12162 with a safety factor of 1.6

Temperature	SDR 21	SDR 33
20 °C	17,1	10.9
40 °C	14,1	9,0
60 °C	11,0	7,0
80 °C	8,3	5,3
120 °C	2,0	1,3

Behavior of PDVF under radiation exposure

Due to its chemical structure, PVDF has good resistance to UV and gamma radiation and is highly resistant to aging. Since it is a translucent material, the media are exposed to UV radiation.

Physiological safety of PVDF

PVDF is suitable for safe use for items intended for repeated contact with food in accordance with FDA "Title 21, Code of Regulations (USA) Chapter 1, part 177.2510". PVDF is approved for use in "US Department of Agriculture (USDA)" processing and storage equipment. PVDF also meets the criteria of "3-A Sanitary Standards for Multiple-Use Plastic Materials Used as Product Contact Surfaces for Dairy Equipment, Serial-No.2000".

Propagation of microorganisms in PVDF pipe systems

The surface of PVDF is just as unfavorable a breeding ground for microorganisms as glass. This is the conclusion of a study, ordered by Solvay and carried out by “Centre d'Enseignement et de Recherches des Industries Alimentaires et Chimiques” (CERIA in Brussels). Because of this property, PVDF is used in the food industry (e.g. in dairies) as well as in the pharmaceutical industry (e.g. for sterilizable precision dosing pipettes) and in the ultra-pure media sector of the semiconductor industry.

Chemical resistance of PVDF piping systems

PVDF has remarkable resistance to most inorganic and organic acids, oxidizing media, aliphatic and aromatic hydrocarbons, alcohols and halogenated solvents. It resists halogens - especially bromine (but not fluorine) - and weak alkalis. It is degraded by fuming sulfuric acid, some strongly basic amines, concentrated and hot alkalis, and alkali metals. Furthermore, it swells in strongly polar solvents such as acetone and ethyl acetate, and is somewhat soluble in aprotic solvents such as dimethylformamide and dimethyl sulfoxide.

As you can see, our PVDF pipe systems are ideally suited for special applications.

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