Materials technical info

To properly fill your needs, it is important to know how technical textiles characteristics can influence the production efficiency. From fiber type to the weave method, the adequate combination of proprieties will certainly improve your project results. A good starting point would be the fiber material: it is the dominant characteristic of a technical textile, being determinant to the filter response once in contact to the production environment. 

DLTT mainly provide products in the following synthetic fibers: Polyester, Polypropylene, Polyamide, PTFE, PPS, Aramid, Acryl, Fiberglass. Each one of them provide excellent technical properties in the final result.

Due to its favorable price, versatility and great performance ratio, polyester is the most commonly used fiber in filter media, especially in dust collection segments. This is a strong and abrasion resistant fiber that works up to 150°C, it is also resistant to acids, solvents and oxidizing agents. It is necessary being aware of polyester’s tendency to hydrolyze at elevated temperature, so moisture can degrade the fibers and cause them to return to their basic constituents. This leads to pulverization of the fibers and serious loss of strength. The main areas of application for Polyester filters are: mining, cement industry, iron and steel industry, aluminum and non ferrous industry, ceramic industry, and many others. 

A relatively low temperature fiber with fairly excellent chemical resistance. Its applications goes from the chemical industry, pre-filtering solvents and acids, to liquid solid separation with strong acidic and alkaline conditions. PP fibers can not be hydrolyzed, and are susceptible to oxidants. This fiber can be used almost universally in temperatures below 90°C. It has a low density, and as a result PP felts are quite thick, almost 50% thicker than the same polyester weight. The fiber is very susceptible to static charge, so the felts are often reinforced by the incorporation of either conductive fibers or a conductive scrim, or even a combination of fibers, helping to dissipate potential static electrical discharges. It has excellent resistance to hydrolysis, acids and alkalis, a smooth surface, with more defined pore sizes and good air permeability. It also presents a lower fiber output, lower density, and high mechanical properties.

Made from 100% PTFE fiber stamped in a three-dimensional structure, this fiber, used as filter media, has properties such as excellent flexibility, high tensile strength, low friction coefficient, creep resistance, high and low temperature resistance, corrosion resistance and anti-aging characteristics. PTFE filter material can meet the requirements of aggressive environments with wide temperature and PH ranges. Since PTFE resin material has very low permeability, it is widely used in the chemical industry excellent barrier resin. The life of PTFE filter material is guaranteed for more than 4 years as long as the temperature is controlled below the maximum operating of 240 °C. PTFE needle felts are used in areas such as waste incineration, carbon black production, combustion filtering and dust collection.

PPS felt is one of the main filter materials able to process the high temperatures. It can also maintain the intensity and inherently carry chemistry, preserving a good filtration performance even in the most hideous environments. Its characteristics makes PPS filter felts the ideal pick to waste incineration and power plant. Although it is important to take notice that this is a fiber which has low oxidation resistance at high temperatures, and will have it operating capacity reduced if the oxygen in the smoke (O2 content) is above 10% and the operating temperature is above 165°C.

Aramid’s high thermostable performance enables it to work well under acid-based conditions at 204°C for a long time. Its high performance in terms of portability and foldability helps to extend the life of the filter material. The high ventilation performance reduces the pressure drop of the dust collector, saves energy and associated costs. Its high performance in its thermal stability and low contraction performance guarantees the end product filter bag size to remain stable. Aramid fiber is chemically resistant to weak acids, weak alkalis and organic solvents. It has a high breaking strength and elongation at break ratio, characteristics that guarantee an end product of high intensity filter materials and good value. Because of its flame retardant with self-extinguishing nature, it is widely used in metallurgical plants, coal-fired boilers, cement plants, and many other applications. 

When used as a filtration media, Acrylic has good acid and alkali resistance, anti-oxidation and hydrolysis resistance, it also has great mechanical properties, an optimal heat stability in both dry and wet conditions, exceptional resistance to light, weather, mold and bacteria. It is widely used in metallurgy, chemical, building material, powerhouse, mechanism industry, petroleum, medicine, printing and dyeing, food and beverage and other industries. 

This is a high temperature resistant filter material with reasonable structure and excellent performance. It is abrasion resistant, low stretch shrinkage ratio, high intension, three-dimensional microporous structure, high porosity, low gas filter resistance, and has higher speed and efficiency. Compared to other high-temperature chemical fiber felt, it has the advantage of a good price-performance ratio. It is broadly used in the chemical, steel and iron, and carbon black industries, as in power and cement plants, as well in filter bags. 

Also known as Nylon, this material is ranked as one of the most resistant kinds of fiber. PA is widely used in automobile tire and ceramic manufacturing, mining, steel, waste and water treatment, metallurgy, rubber and many other industries due to its high strength, good resistance and permeability, as well as its easy stripping. To better perform its characteristics, PA fibers should not be submitted to temperatures above 130ºC

Due to its recyclability, polyethylene is a eco-friendly fabric, it is also safe for contain potable water and and long-term reliability. Polyethylene is durable and tough, it is resistent to corrosion and has freeze-break features.