Solvay’s fluoropolymers are used to make microfiltration and ultrafiltration flat sheet and hollow fiber membranes for a wide range of bioprocessing and medical filtration applications.
Molecular weights with controlled viscosities along with very high purity levels make these materials an excellent choice for membranes covering a broad range of porosity and shapes.
Excellent chemical resistance combined with hydrolytic stability, high strength and the ability to operate over a broad pH range makes these polymers the right choice for membranes used in demanding end-use environments.
(1) 10% NMP, 23°C, 50 rpm
(2) Melt flow condition 230°C, 5.0 kg (ASTM D 638)
(3) Melt flow condition 230°C, 2.16 kg (ASTM D 638)
(4) Melt flow condition 275°C, 2.16 kg
(5) Melt flow condition 275°C, 5.0 kg
(1) Measured at 50 mm/min
(2) Measured at 2.5 mm/min
(1) In absence of UV light
(2) Maximum 40 MRad
"+": Polymer is resistant. Any increase in weight is less than 2% and any decrease in weight is less than 0.3%. The tensile yield strength is at least 85% of the initial value.
"0": Use of polymer is limited. Response does not meet above criteria. For example, weight increase may be more than 2%. However, the polymer can be used if stress is low.
"–": Polymer is not resistant. There is considerable alteration of the polymer, such as dissolution or chemical or physical degradation.
1. In general Solef is very resistant to inorganic acids. In carboxylic acids, the acidity does not affect polymer performance, although swelling may occur.
2. Dipolar aprotic solvents is a huge class of chemicals: some are solvents for PVDF (e.g. NMP) while some can be recommended for use in contact with PVDF at low temperatures (e.g. butyl acetate).
3. Chlorine and ozone are able to generate free radicals that can attack PVDF. In conditions promoting the formation of radicals (e.g. UV light), care must be taken for the use of the polymer as chemical attack was observed.
4. Gamma radiation could damage PVDF depending on the radiation dose. Good resistance was observed up to 20-40 MRad, but chemical attack may occur at higher doses.
DMF: N,N-Dimethyl Formamide
DMSO: Dimethyl Sulfoxide
TEP: Triethyl Phosphate
For further specifications and details regarding these agency approvals, please contact your local sales representative.
Solef® PVDF homopolymers are used to make durable, long-lasting membranes. Their toughness, chemical resistance and oxidative stability allow membranes to tolerate a wide variety of feed streams and cleaning methods. These materials are soluble in conventional processing solvents to make hollow fiber and flat sheet membranes by DIPS and TIPS processes.
Solef® PVDF homopolymers are made using a suspension-type polymerization process which provides a linear, gel-free product. They are available in powders and pellets that cover a wide range of molecular weights. High molecular weight grades improve fiber strength and minimize fiber breakage.
Solef® is also a broad MWD grade of PVDF with low crystallinity and physical properties of standard homopolymers. Solef® 460 also has a relatively high concentration of chain branches that give it unique resistance properties in certain applications.
*Data from GPC in DMAc with calibration in polystyrene**10% solids solution in NMP, 25°C
Halar® ECTFE is based on ethylene and chlorotrifluoroethylene. It offers outstanding chemical resistance over a broad temperature range and is stable at pH levels from 1 to 14.
Because of its exceptional chemical resistance, the material cannot be processed using solution phase inversion. Instead, it must be processed at temperatures close to its melting point (200 –240°C) using a TIPS process for hollow fibers. Two grades having different molecular weights and melt temperatures are available.
Algoflon® PTFE (polytetrafluoroethylene) is an inert, non-toxic polymer with unique performance and processing attributes. It is available in fine coagulated white powders produced by dispersion polymerization, then processed by paste extrusion into a fibrous matrix with structural integrity.
Algoflon® DF powders are easily expanded after extrusion of the polymeric matrix without the use of soluble fillers, foaming agents or chemical additives. This process generates the physical creation of a huge number of small pores in the structure of an object made of PTFE, providing an exciting new level of performance properties.
AquivionTM PFSA (perfluoro sulfonic acid polymer) is a functionalized perfluoro-ionomer produced from vinyl fluoride monomer and sulfonyl fluoride vinyl ether. The polymer’s short, low molecular weight side chains make it unique among ionically conductive perfluoropolymers and impart unique performance advantages.