Continued Discussion: Comparative Analysis of the Properties and Performance of Different Materials Used for Centrifuge Filter Screens

Release time:

2016-11-24

Overview:

Centrifuge

　　 Centrifuge The filter screen is a critical component of a centrifuge, so it’s impossible to cover everything in a single article. Today, we’ll continue our discussion by comparing and analyzing the performance characteristics of filter screens made from different materials. The key performance indicators we’ll focus on include elongation at break, recoverability, abrasion resistance, heat resistance, softening point, and melting point.
　　First, let’s start with the materials used for centrifuge filter screens. We’ll compare four common materials—polyester, polypropylene, nylon, and vinylon. The first property we’re going to analyze is elongation at break. According to Baidu, “elongation at break” is an indicator used to measure the relative strength of fibers. In practical production, rather than directly measuring it using the hanging method, the value is typically derived from tensile strength calculations. The concept is that the length (in kilometers) at which the gravitational force acting on a single fiber equals its breaking strength is considered the elongation at break. Research and experimental studies have shown that polyester has an elongation at break ranging from 30% to 40%, while polypropylene’s elongation at break is higher than polyester’s. Nylon’s elongation at break falls between 18% and 45%, and vinylon’s ranges from 12% to 25%. Based on these figures alone, it’s difficult to establish a clear ranking among these materials. Therefore, it’s crucial for both potential buyers and centrifuge manufacturers to engage in more communication and thorough discussions!
　　Next, let’s analyze the recovery performance. Here, the editor would like to focus on the centrifugal filter mesh made of nylon. Pay close attention—now is the time to really underline and emphasize: when nylon is stretched by 10%, its recovery rate exceeds 90%. This is a distinctive feature of nylon. As for other materials, polypropylene performs better than polyester, while vinylon falls into the poorer category.
　　Next, we’ll analyze wear resistance—a key performance characteristic of centrifuge filter screens that deserves close attention. While proper maintenance can certainly benefit a centrifuge, choosing the wrong filter screen from the very beginning—specifically, one that lacks sufficient wear resistance—can render even the best maintenance efforts ineffective. Therefore, this performance feature is extremely important. According to extensive data, polyester and nylon exhibit excellent wear resistance, followed by polypropylene, and finally, vinylon.
　　After reviewing the three points above, we need to take a good look back—especially focusing on the third point. Centrifuge The wear resistance of the filter mesh and, secondly, the resilience of the nylon material.
　　Next, let’s move on to the last three of the six performance characteristics. The fourth characteristic is heat resistance. Since heat resistance is primarily categorized based on temperature, and temperatures are specified in precise degrees, we’ll simply list them in descending order according to their maximum heat-resistant temperatures: Polyester > Nylon > Vinylon > Polypropylene (for detailed temperature classifications, please refer to the table below; under appropriate conditions, consult the centrifuge supplier).

Performance Comparison Table for Centrifuge Filter Meshes of Common Materials:

Performance	Polyester	Polypropylene	Nylon	Vylon
Elongation at break	30-40%	Greater than Polyester	18-45%	12-25%
Responsive	Very good	Slightly better than polyester	The recovery rate exceeds 90% at a strain of 10%.	Poorer
Wear resistance	Very good	Good	Very good	Better
Heat resistance	170℃	Slight shrinkage at 90℃	Slight shrinkage at 130℃	Slight shrinkage at 100℃
Softening point	230℃-240℃	140℃-150℃	180℃	200℃
Melting point	255℃-265℃	165℃-170℃	210℃-215℃	220℃

　　 Speaking of heat resistance, we naturally have to talk about temperature. Temperature is inherently divided into high and low ranges. From this, we can infer that centrifuges will encounter high temperatures during operation. Consequently, when working at high temperatures, phenomena such as softening and melting may occur. Both of these—softening and melting—are closely related to heat resistance and can be quantified by temperature. Let’s start with softening. The softening point of centrifuge filter screens varies depending on the material used. For polyester, the softening point ranges from 230°C to 240°C; for polypropylene, it’s between 140°C and 150°C; and for nylon, it’s around 180°C—note that for nylon, the softening point is a specific temperature rather than a temperature range. Similarly, for vinyl, the softening point is also at 200°C. Given these softening temperatures, you can roughly estimate the melting points as well: typically, the melting point is about 20°C higher than the softening point. Thus, for polyester, the melting point is approximately 255°C to 265°C; for polypropylene, it’s around 165°C to 170°C; for nylon, it’s between 210°C and 215°C; and for vinyl, it’s 220°C.
　　The above is a general performance analysis of the common materials used for centrifuge filter screens. As this is merely one person’s perspective, there may be some inaccuracies. We welcome your calls to provide additional insights, discuss, and make corrections. We hope to work together to develop a more effective and precise comparison methodology for the benefit of all. Centrifuge Buyers, please take note!

Laboratory centrifuges employ different separation methods.

The application field of a centrifuge determines the material.