When wiping lenses, wafers and PCB pads in Class 100 cleanroom environments, many factories have encountered the following issues: after wiping, minute fibres and particles remain on the surface of the workpieces, whilst the wiping solution leaves water marks, resulting in defects on high-value workpieces. Such problems often stem not from operational procedures, but from an inadequate match between the selected lint-free cloth and the application. Li Jieqing 3109A ultra-fine lint-free cloth is a precision wiping consumable developed specifically for Class 100 wiping applications.
Why are standard polyester cloths unsuitable for Class 100 wiping?
Ordinary polyester lint-free cloth has relatively large fibre diameters and relies on a fibre mesh to trap larger particulate contaminants; its adsorption capacity for sub-micron particles is limited. If the edge-sealing process is not carried out properly, there is a risk of fibres shedding from the edges. When wiping optical lenses or wafer surfaces in Class 100 environments, shed fibres and residual particles can directly cause defects in the workpieces, resulting in high rework costs.
To achieve effective Class 100 wiping, the fabric’s fibre structure, edge-sealing process and cleaning and purification procedures are all indispensable; these are precisely the areas that Li Jieqing, the manufacturer of dust-free wipes, has focused on refining in its 3109A product.
Ultra-fine fibre structure enhances particle adsorption capacity
Li Jie Qing’s 3109A ultra-fine lint-free cloth is woven from a composite of polyester and nylon in an ‘island-type’ ultra-fine fibre structure. The fibres have a very small diameter, creating a dense network of capillary micro-pores within the fabric. Compared to ordinary polyester cloth, it does not merely block particulate matter; it also utilises the capillary effect to capture and trap sub-micron dust and oil residues, thereby reducing the likelihood of secondary particle transfer onto workpiece surfaces during the wiping process, making it suitable for use as an optical wiping cloth.
The product utilises a laser-sealed edge process to minimise fibre shedding at the edges; the finished product is washed with 18 megohm deionised water and then packaged in a cleanroom environment to control the levels of ions and non-volatile residues on the fabric surface. It is suitable for Class 100 cleanroom environments and can be used in processes such as chip packaging, lens cleaning and precision PCB pad wiping.
Distinguishing between operating conditions: choosing the right wiping cloth reduces defects
As a Class 100 cleanroom cloth, the 3109A is particularly suitable for the delicate wiping of precision components; for general workstations such as dust removal from large-area equipment casings, standard polyester cleanroom cloths may be selected to balance usage costs. During use, when combined with electronic-grade solvents and adhering to operational guidelines—such as wiping once only and avoiding repeated wiping of the same area—the risk of defects caused by wiping is further reduced.
Post time: Sep-28-2026