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How to identify the quality of PTFE packing
Weaving density:
The most critical factor affecting the performance of GRAFI-SEALGT5110 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 now is to suggest that in most applications, GT5110 fiber woven PTFE packing, which is as tight and orderly woven as possible, will produce the best results for specific applications. Experience tells us that tightly woven PTFE packing not only resists wear and squeezing, but also does not deform under elevated temperatures, thereby reducing the adjustment of PTFE packing and effectively controlling leakage.
On the other hand, the loose weaving of the PTFE packing will result in an increase in the length of the PTFE per pound. This does not mean that users who use these loose PTFE packing will benefit from it. On the contrary, in the actual filling process, the filling of the stuffing box will consume more of this loose packing, so the aramid fiber packing is unlikely to have such theoretical savings. In fact, the cost of repairs will increase with the replacement of PTFE packing and the increase in downtime. An effective method for increasing the density of PTFE packing is that the manufacturer recompresses the tightly woven PTFE packing. This will make the PTFE packing tighter, evenly flat, and the four corners at right angles. [Oil-containing PTFE Packing Oil-free PTFE Packing White PTFE Packing Black PTFE Packing]
Size range:
Another factor that affects the effect of PTFE packing is its choice of size. However, the Fluid Sealing Association adopts a default attitude toward the practice of deviating from the original size in both dimensions. We emphasize that dimensions should be avoided larger than the standard size. The GT5110 PTFE packing can be operated at less than or equal to the standard size. In this way, the woven PTFE packing can be installed correctly under some special conditions. It minimizes downtime and the likelihood of installation failure. Wheel woven and formed seal rings are two effective ways manufacturers can follow to follow the dimensional specifications.
Weaving integrity:
Although some PTFE packings are braided and sheathed. However, in many applications, the GT5110 fiber is woven in a form of heart-weaving. Because this structure is suitable for GT5110 fiber, it has the most significant effect in the field of pump sealing. According to the fluid seal association graphite composite gasket identification, the core-woven PTFE packing has: "The fibers are tightly entangled, as a whole, not easy to unravel and separate during maintenance. It will not be loose without the envelope. The core-woven PTFE packing is more uniform in density and has the potential to maintain lubrication. "The PTFE packing woven by the non-threading method is ideal for many occasions without the need for heart-weaving. Of course, the same is the way to weave, the methods used by various companies are not the same. However, as a heart-weaving, all weaving is carried out around a straight fiber. By this surrounding motion, the strands are entangled, with the result that the braid (tetrafluoro-residue) is tough and integral. Some weavers reduce the use of central straight strands, and weaving is only focused on the outer or four corners of the PTFE packing. Others place too many strands in the inner or center of the PTFE packing. Although different methods produce different weaving effects, the most important criterion for performance is the density of the weave. Of course, if the design of the core weave is neglected, the PTFE packing will cause the strand to break under the tensile stress and lose the combined effect of the weaving. [Teflon packing pure PTFE packing PTFE braided packing PTFE aramid packing]
We recommend that, if possible, the weaving of PTFE packing should be produced on machines with multiple spindles and multi-tracks. The multi-number of spindles means that there are more strands entangled, and as a result, the PTFE packing becomes durable. The PTFE packing produced on the four-track machine is flatter and smoother than the outer surface of the PTFE packing produced on the three-track machine. This will undoubtedly improve the sealing efficiency of the PTFE packing and reduce the sealing effect. Pressing force. However, we also recognize that in some cases (especially in small-sized PTFE packing), the use of four machines may not be appropriate.
Performance component integrity:
After considering the overall performance standards of PTFE packing, GT5110 fiber has been carefully designed. In a pure environment, all of its test indicators are optimized. End users should be careful not to add extra lubricant when servicing PTFE packing, which will make the original performance of PTFE packing not fully utilized. 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.
We have found on some occasions that some weavers incorporate other strands into the GT5110 fiber to make it look more attractive. This is understood from the market logic that can be understood at high water-based disk prices, but this is not feasible. Even a small amount of addition will damage the overall performance of the GT5110 PTFE packing. For example, adding a material with poor thermal conductivity will reduce the thermal conductivity of the PTFE packing. It also exacerbates the wear and tear of the equipment. Adding a chemical-resistant pH range that does not meet the GT5110 fiber standard will limit one of the main advantages of GT5110 PTFE packing – versatility. If hard materials are added, it will increase the wear and tear of the equipment and affect the service life. Some woven commercial inexpensive filler fibers are added to the center of the PTFE packing to reduce cost. Although these fibers are dyed or similar in shape to the GT5110 fiber, they significantly reduce the efficiency of PTFE packing. Therefore, we believe that the PTFE packing effect of GT5110 fiber is most ideal.
[Fluoric packing is marked with PTFE packing technology PTFE packing performance]
Hebei Innovation Sealing Material Co., Ltd.
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