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PE (Polyethylene) Membranes

PE (Polyethylene) Membranes

STERLITECH https://www.cotecno.cl/shop/pe-polyethylene-membranes-629497 https://www.cotecno.cl/web/image/product.template/629497/image_1920?unique=2c0d65f

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Descripción general

Preguntas frecuentes

Q. Will Sterlitech Track Etch filter membranes keep liquid behind the filter and let gases pass through?

A. PVP-Free Polycarbonate membranes have a water contact angle of approximately 90° and will not spontaneously wet out with liquids that have a surface tension equivalent to or greater than water (1 dyne). Due to the low water contact angle, polycarbonate membranes do not make effective vent filters. Low differential pressures will allow liquid water to break through the pores. We recommend membranes with a higher water entry pressure such as Hydrophobic PTFE, Hydrophobic Polyethylene, and Oleophobic Polyester for venting applications. Effective vent filters will allow permeation of gasses, while blocking liquid from entering the pores. Water vapor and other gases will pass through a hydrophobic vent membrane.

The maximum operating temperatures for Sterlitech filter membranes are listed below.

  • Sterlitech Silver Metal - 427°C
  • Sterlitech Ceramic - 350°C
  • Sterlitech Polycarbonate Track Etch - 140°C
  • Sterlitech Polyester - 140°C
  • Sterlitech Nitrocellulose (MCE) - 130°C
  • Sterlitech Nylon - 180°C
  • Sterlitech Polyethersulfone (PES) - *130°C
  • Sterlitech Polypropylene - 82°C
  • Sterlitech Cellulose Acetate - 135°C
  • Sterlitech PTFE (Laminated) - 130°C
  • Sterlitech PTFE (Unlaminated) - 260°C
  • Sterlitech PVC Data not available

*5.0um and 8.0um - max temp is 180°C

Nominal Tamaño de poro ratings are provided as a general indication of filter retention. It is understood that some quantity of particles greater than, and equal to, the nominal Tamaño de poro ratings will pass through the filters into the filtrate. Some manufactures may associate nominal Tamaño de poro ratings with percentage filtration efficiencies. Nominal Tamaño de poro ratings vary from manufacturer to manufacturer and, consequently, are not necessarily equivalent. Filters from different manufactures with similar nominal Tamaño de poro ratings may not actually exhibit similar retention characteristics.

Absolute Tamaño de poro ratings are typically based on retention studies performed using challenge suspensions of standard microorganism cultures or particles of known size. Absolute Tamaño de poro ratings represent the size of the smallest microorganisms or particles completely retained during these studies. Absolute Tamaño de poro ratings are almost always correlated to bubble point Especificaciones that are used for quality control during membrane manufacturing. For the most part, absolute Tamaño de poro ratings, especially those based on microbial retention, are comparable from manufacturer to manufacturer. There is more uncertainty for absolute Tamaño de poro ratings based on particle retention studies, especially for Tamaño de poro ratings <0.2µm, since there are no standard methods for these studies.

Regardless of Tamaño de poro ratings, it is important to understand that application conditions do influence particle retention. Even filters with absolute Tamaño de poro ratings can be operated in conditions that will allow unexpectedly sized particles to pass.

The Tamaño de poro refers to the diameter of the individual pores in a Filtro de membrana. Tamaño de poro is typically specified in micrometers (µm). Most membranes and filter media actually contain a distribution of pore sizes. Nominal Tamaño de poro ratings typically refer to the predominant Tamaño de poro of a filtration media; pores larger and smaller than the nominal rating may be present. Absolute Tamaño de poro ratings typically refer to the largest Tamaño de poro of a membrane and it is expected that all pores will be equal to or smaller than the absolute rating.

For the polycarbonate track-etch (PCTE) and polyester track-etch (PETE) Filtros de membrana, porosity is the percent of the total surface area occupied by the pores; it typically ranges from <1% to 16%. For the other Filtros de membrana, porosity is the percent of the total volume occupied by the pores; it typically ranges from 40 to 80%.

The bubble point is the minimum amount of pressure required to push air bubbles through the largest pore of a wet membrane. The bubble point is inversely proportional to the pore diameter, as the pore diameter decreases the bubble point increases and vice versa.

Retention efficiency of Filtros de membrana can be directly measured by challenging the filters with suspensions of standard microorganism cultures or particles of known size. Unfortunately, such efficiency testing is necessarily destructive. However, since retention characteristics are dependent on Tamaño de poro, it is possible to correlate destructive challenge testing results to non-destructive membrane bubble point tests. In this manner, the relationship between membrane Tamaño de poro and membrane bubble point is empirically determined. Typically, a minimum bubble point can be determined and specified for a particular Tamaño de poro rating. The bubble point Especificación is then used for quality control during membrane manufacture. The bubble point can also be used by the consumer as a nondestructive test to verify membrane integrity before and/or after use.

Sample packs allow the customer to purchase small quantities of Filtros de membrana at nominal cost, with various diameters and pore sizes as selected. This allows the customer to preform trials as needed to determine the optimal filter for their application before committing to purchasing standard pack quantities.

Especificación
0.1 µm · 200 x 200 · pack 5
0.1 µm · 25 mm · pack 100
0.1 µm · 300 x 3000 · pack 1
0.1 µm · 47 mm · pack 100
0.1 µm · 90 mm · pack 25
0.2 µm · 200 x 200 · pack 5
0.2 µm · 25 mm · pack 100
0.2 µm · 300 x 3000 · pack 1
0.2 µm · 47 mm · pack 100
0.2 µm · 90 mm · pack 25
0.45 µm · 200 x 200 · pack 5
0.45 µm · 25 mm · pack 100
0.45 µm · 300 x 3000 · pack 1
0.45 µm · 47 mm · pack 100
0.45 µm · 90 mm · pack 25
Tamano de poro 0.1 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.2 0.2 0.45 0.45 0.45 0.45 0.45
Tamano de paquete 5 100 1 100 25 5 100 1 100 25 5 100 1 100 25
Diametro (mm) — 25 — 47 90 — 25 — 47 90 — 25 — 47 90
Tamano de hoja 200 x 200 — 300 x 3000 — — 200 x 200 — 300 x 3000 — — 200 x 200 — 300 x 3000 — —
Rating Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute Absolute
Espesor 60-90 60-90 60-90 60-90 60-90 80-110 80-110 80-110 80-110 80-110 125-168 125-168 125-168 125-168 125-168
Caudal de agua limpia 3 3 3 3 3 6.8 6.8 6.8 6.8 6.8 12.5 12.5 12.5 12.5 12.5
Punto de burbuja 2.48-3.45 2.48-3.45 2.48-3.45 2.48-3.45 2.48-3.45 1.65-2.21 1.65-2.21 1.65-2.21 1.65-2.21 1.65-2.21 1.03-1.45 1.03-1.45 1.03-1.45 1.03-1.45 1.03-1.45