Discussion on the four basis for distinguishing the quality of PTFE packing
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There are four main aspects that affect the quality of PTFE packing:
1. Size range:
Another factor that affects the effectiveness of PTFE packing is its size choice. However, the Fluid Sealing Association adopts a default attitude toward the deviation from the original size in both dimensions. We emphasize that the size should be avoided larger than the standard size. GT5110 PTFE packing can work in less than or equal to the standard size. With this method, the braided PTFE packing can be properly installed under some special conditions. It minimizes downtime and the possibility of installation failure. Wheel pressure braiding and forming seal rings are two effective ways for manufacturers to follow dimensional specifications.
2. Woven density:
The most critical factor affecting the performance of fiber woven PTFE packing is its weaving density. However, weaving itself is very artistic, and weaving density is often difficult to reflect with numerical values. What we can do at present is to suggest that, for most applications, we should use those woven PTFE packings that are as closely and regularly weaved as possible, which will produce the best results for specific applications. Experience tells us that tightly woven PTFE packing not only resists wear and extrusion, but also does not deform at elevated temperatures, which reduces the adjustment of PTFE packing and effectively controls leakage.
On the other hand, loose weaving of PTFE packing will lead to an increase in the length of PTFE packing per pound. This does not mean that users who use these loose PTFE packings will benefit from it. On the contrary, in the actual packing process, filling the stuffing box will consume more of this loose filler, so the theoretical savings of aramid fiber packing cannot be achieved. In fact, maintenance costs will also increase with the replacement of PTFE packing and downtime. An effective way to increase the density of PTFE packing is for the manufacturer to compress the tightly packed PTFE packing again. This will make the PTFE packing more compact and evenly flat, and the four corners are at right angles.
3. The integrity of performance components:
After considering the performance standards of PTFE packing, GT5110 fiber was carefully designed. In a pure environment, its experimental indicators are all optimal. The end user should pay attention not to add extra lubricant when overhauling the PTFE packing, which will make the original excellent performance of the PTFE packing not fully exerted. Because this will increase the weight of the PTFE packing and reduce the plasticity, the PTFE packing will lose its impact resistance and the maintenance cost will increase accordingly.
4. Weave integrity:
Although some PTFE packings are braided and jacketed. However, in many applications, the weaving of GT5110 fibers is done in the form of a through-weave. Because this structure is suitable for GT5110 fiber, it has the most significant effect in the field of pump sealing. According to the fluid sealing association graphite composite gaskets identification, the PTFE core packing weaving through the heart has: "The tight intertwining between fibers, like a whole, is not easy to untie and separate in maintenance. It will not loose in the absence of envelopes. The woven packing of the woven PTFE cores has a more uniform density and has the potential to maintain lubrication. "The use of non-through-weave PTFE packings, in many cases, is not ideal for weaving. Of course, the same is used for weaving through the heart, and the methods used by various companies are not the same. However, as weaving through the heart, all weaving is carried out around a straight fiber. Through this movement around, the strands are tangled, and as a result, the braid (PTFE packing) is tough and becomes a whole. Some weavers reduce the use of central straight strands, and weaving only focuses on the outer layer or corners of the PTFE packing. Others place too many strands on the inner or center of PTFE packing. Although different methods produce different weaving effects, the main criterion for performance is the density of weaving. Of course, if we ignore the design of the weaving through the heart, the PTFE packing will cause the strands to break and lose the weaving effect when the tensile stress is applied.
Material:Filter Glass,BK7
Dimension: 4mm-160mm - 0.20mm
Squares/Rectangles:1mm-165mm
Thickness:0.5mm-4mm
Wavelength range:190nm to 4.5um
Thickness tolerance:+/-0.01mm-0.1mm
Edges:Fine
Ground Flatness:Up to Lambda/10
Surface quantity: 80/50-20/10 Scratch/Dig