With opening tolerances at ±2µm, ASTM Precision Electroformed Sieves consistently deliver greater accuracy for precision particle sizing operations than woven wire sieves. The wide range of opening sizes down to 5µm make them an ideal choice for very fine powders when used with vibratory or sonic shakers. Electroformed Sieves can be used with dispersing or wetting agents and also serve as a reliable reference standard when calibrated with glass beads or other reference materials. We recommend using ultrasonic cleaning methods for these precision sizing instruments.
Electroformed sieve cloth is formed using electrodeposition of nickel, producing a planar mesh with very consistent square openings. Each sieve is measured at over 100 random openings and supplied with a Certificate of Compliance to meet ASTM E161, ISO 565 and ISO 3310-3 standards.
Gilson Electroformed Sieves have stainless steel 8in (203mm) or 3in (76mm) diameter full or half-height stainless steel frames. The Electroformed cloth is bonded to the frame with an epoxy ring. The frame stacks with ASTM E11 woven-wire sieves. The support grid increases strength and durability but blocks some openings and reduces sieving efficiency.
The“U” suffix after model numbers specifies models without the support grid (price is the same). Lines Per Inch (LPI) value indicates the number of openings of the specified size occurring in one linear inch (25.4mm). Higher LPIs are more fragile while low LPIs have thicker metal but fewer openings. Stacking heights for eight inch diameter frames are 2in (50.8mm) and 1in (25.4mm). Three inch frames have stacking heights of 3in (76.2mm) and 1in (25.4mm).
We also customize orders for sieves with other LPIs or larger opening sizes than those listed. Contact us for assistance with maintenance or special order requests.
Electroformed Sieves in combination with instruments like Gilson’s AutoSiever and UltraSiever are often more productive than standard mechanical shakers with woven wire sieves. While the initial price of Electroformed Sieves is substantially higher than woven wire sieves, their accuracy, efficiency and size range often make them a better solution for precision particle sizing operations. Dry sieving is preferred when the material allows it. Wet sieving is indicated for materials with a tendency to agglomerate. The high surface tension of water sometimes makes passage of liquid difficult, but use of dispersing or wetting agents, hydrocarbons or other low surface tension liquids can be helpful.
Electroformed sieves are precision instruments and should be treated carefully. For ultrasonic cleaning, use extreme caution until it is known that the system is suitable for each sieve size. Select lower energy output with frequency above 40kHz for 20 seconds or less. Sieves should be positioned vertically, and addition of ethyl or isopropyl alcohol to tank water will decrease erosion risk. Drying temperature should not exceed 100°C. Please contact us if your desired opening size is not listed, we are happy to special order that size.
Due to the fragile nature of Precision Electroformed Sieves and their special ordering requirements, Gilson assumes no responsibility for damage in use, and electroformed sieves are nonreturnable when supplied as ordered.