CATEGORIES

    DC Microhole Detector

    Overview Knowledge Standards Terms
    The DC micropore detector determines the number and distribution of pores by applying a DC voltage to measure changes in the electrical conductivity of micropores in materials. It is used for porosity testing of materials such as paper and films to control product quality and process parameters.
    Selection
    When selecting, consider the material's conductivity to match the test voltage range, determine the resolution based on aperture distribution requirements, choose the electrode specifications in conjunction with the sample thickness, and refer to industry standards to verify measurement repeatability.
    type
    Coated Film thickness
    Voltage range

    Terms

    AC Spark Tester
    Three-hole constant temperature circulation bath
    Porosity Measurement Instrument
    Apparent Density
    RT X-ray flaw detector
    Ford viscosity cup No. 4
    Wet Sponge DC Leak Detector
    Optical high-power microscope
    DC Pinhole Detector
    Viscosity dip cup

    Standards

    Incoming GB/T 21650.1-2026
    Determination of pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption—Part 1: Mercury porosimetry
    Active GB/T 10653-2001
    Polymeric materials，cellular flexible--Determination of compression set
    Active GB/T 10654-2001
    Flexible cellular polymeric materials--Determination of tensile strength and elongation at break
    Active GB/T 22638.2-2016
    Test methods for aluminium and aluminium alloy foils—Part 2: Determination of pinhole
    Active GB/T 1965-2023
    Porous ceramics—Test method for flexural strength at room temperature
    Active GB/T 1964-2023
    Porous ceramics—Test method for compressive strength at room temperature
    Active GB/T 7702.20-2025
    Test method for granular activated carbon from coal—Part 20: Determination of pore volume and specific surface area
    Active GB/T 2679.14-1996
    Filter paper and filterboard--Determinationof maximum pore diameter
    Active GB/T 33052-2016
    Microporous functional membrane—Measurement for Porosity—Absorption method by cetane
    Active GB/T 3810.3-2016
    Test methods of ceramic tiles—Part 3: Determination of water absorption, apparent porosity, apparent relative density and bulk density
    Active GB/T 9966.3-2020
    Test methods for natural stone—Part 3:Determination of water absorption,bulk density,true density and true porosity
    Active GB/T 40336-2021
    Non-destructive testing—Leak testing—Calibration of reference leaks for gases
    Active GB/T 6003.2-2024
    Test sieves—Technical requirements and testing—Part 2:Test sieves of perforated metal plate
    Active GB/T 44748.1-2024
    Test sieving—Part 1: Methods using test sieves of woven wire cloth and perforated metal plate
    Active GB/T 24328.10-2020
    Tissue paper and tissue products—Part 10: Determination of tensile strength of perforated lines and calculation of perforation efficiency

    Articles

    Application of Gravure Printing Proofer in Water-based Ink Proofing and Pinhole Defect Evaluation
    This article introduces how the gravure printability tester is used for water-based ink proofing and pinhole defect evaluation. Water-based inks are environmentally friendly but prone to tiny pinhole defects. The instrument enables standardized sample preparation and reduces human interference by controlling parameters such as cell depth and doctor blade angle.
    Handheld viscosity cups are used for rapid assessment of paint viscosity at construction sites.
    A handheld viscosity cup is a portable tool used to quickly assess the viscosity of coatings at construction sites. It operates based on the flow-out time method, calculating viscosity by measuring the time it takes for the coating to flow out of the cup's orifice. It is suitable for Newtonian or approximately Newtonian fluids.
    Vacuum adsorption coating table solves the problem of film substrate wrinkling.
    The vacuum adsorption coating platform uses a microporous array connected to a vacuum system beneath the tabletop to create a pressure difference, tightly adsorbing the film substrate. This ensures it remains flat during the coating process, preventing wrinkles that could lead to uneven coating.
    BET surface area analyzer evaluates the pore structure of ion exchange resins
    This article introduces how to use a specific surface area analyzer to evaluate the pore structure of ion exchange resins.
    Coulometric thickness gauge measures the sealing quality of anodic oxide films.
    This article introduces a method for assessing the sealing quality of anodic oxide films using a coulometric thickness tester. The sealing quality affects the corrosion resistance and wear resistance of the oxide film. Based on electrochemical principles, the coulometric thickness tester evaluates the sealing effectiveness by measuring the electric charge required to dissolve the oxide film, providing objective and repeatable results.
    Key steps for measuring the efflux time of varnish using a viscosity cup method
    This article introduces the method for measuring the outflow time of varnish using a viscosity cup. The principle is based on Poiseuille's law, where viscosity is estimated by recording the time it takes for the liquid to completely flow out from the small hole at the bottom of the cup—longer times typically indicate higher viscosity.
    Bauer-McNett Classifier Method and Fiber Fractionation Principle of Pulp Fiber Classifier
    The Bauer-McNett classifier is a standard method that separates fibers by length and morphology through the sequential screening of pulp suspensions using sieves with different aperture sizes.
    Porosity Control in the Preparation of Porous Coatings During the Blade Coating Process
    Doctor blade coating is a wet coating technique widely used for preparing functional coatings, which involves uniformly applying a slurry containing solid particles (such as ceramics, polymers, or metal oxides) onto a substrate, followed by drying and heat treatment to form the coating.
    Types and Selection of Paint Viscosity Cups
    As a simple tool for measuring the liquid outflow time, the viscosity cup is mainly categorized into various types such as the Tu-4 cup, ISO cup, Ford cup, and Zahn cup, based on standards from different countries and regions. These cups differ in orifice size, capacity, and the types of fluids they are suitable for.