{"product_id":"ejgmfpprt","title":"ECS-JG Manual Four-Probe Powder Resistivity Tester, EJGMFPPRT","description":"\u003cp\u003eA manual four-probe resistivity tester is a fundamental characterization system used in battery material research and quality control. It evaluates the intrinsic electrical conductivity and electronic resistivity of dry powder samples—such as cathode active materials (NMC, LFP), anode materials (graphite, silicon composites), conductive additives (carbon black, CNTs), and solid electrolyte powders—as a function of compaction pressure and tap density. The four-point (Kelvin) method eliminates contact and wire lead resistance: (1) \u003cstrong\u003eOuter Probes\u003c\/strong\u003e: Apply a controlled DC current through the compressed powder sample. (2) \u003cstrong\u003eInner Probes\u003c\/strong\u003e: Measure the resulting voltage drop across a known distance. Because the voltmeter has near-infinite input impedance, virtually no current flows through the inner pins, yielding true material resistance.\u003c\/p\u003e\n\u003cp\u003ePowder resistivity drops exponentially as compaction force increases because inter-particle contact areas expand and void fraction decreases. Measuring this relationship helps battery engineers: (1) \u003cstrong\u003eOptimize Electrode Calendering\u003c\/strong\u003e: Determine the threshold density where electronic transport plateaus without crushing active particles or over-compacting. (2) \u003cstrong\u003eScreen Conductive Additives\u003c\/strong\u003e: Evaluate the percolation threshold of new carbon black, graphene, or CNT batches at minimal weight percentages. (3) \u003cstrong\u003eAssess Cathode Coating Uniformity\u003c\/strong\u003e: Compare pristine vs. surface-modified active materials (e.g., carbon-coated LFP or oxide-coated NMC).\u003c\/p\u003e\n\u003ctable style=\"width: 100%; height: 825.875px;\" width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 51.675px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 51.675px;\"\u003e\u003cem\u003ePart Number\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 51.675px;\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eEJGMFPPRT (EJG-MFPPRT) \u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 47.6px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 47.6px;\"\u003e\u003cem\u003ePower\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 47.6px;\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eAC220V\u003cspan style=\"font-size: 0.875rem;\"\u003e±10%, single phase, 50\/60Hz, ~10W\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 275.8px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 275.8px;\"\u003e\u003cem\u003eSoftware \u0026amp; Control Interface\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 275.8px;\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eParameters setting and status display\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHistoric testing data can be sourced and checking\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eResistivity vs. pressure curve \u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eTesting report generation and print\u003c\/span\u003e         \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_02_160x160.jpg?v=1785616026\" alt=\"\" style=\"margin-bottom: 16px; float: none;\"\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 126px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 126px;\"\u003e\u003cem\u003eTesting Resistivity Range\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 126px;\"\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\n\u003cul\u003e\n\u003cli\u003eResistivity: 10*10^(-6) Ω*cm ~ 200 kΩ*cm; \u003c\/li\u003e\n\u003cli\u003eSquare Resistance: 1.5*10^(-6) Ω\/□ ~100 Ω\/□; \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eDigital Voltage Reading: 200 mV ~ 2 V, automatic\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan style=\"font-size: 0.875rem;\"\u003eCurrent Levels: 0.1 uA, 1 uA, 10 uA, 100 uA, 1 mA, 10 mA, 100 mA, and 1 A\u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 165.2px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 165.2px;\"\u003e\u003cem\u003eTesting Pressure\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 165.2px;\"\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\n\u003cul\u003e\n\u003cli\u003eStandard Pressure: 4 MPa±0.05 MPa\u003c\/li\u003e\n\u003cli\u003ePressure Range: Max. 30 MPa, adjustable\u003c\/li\u003e\n\u003cli\u003ePressure Display: 0-20 MPa, resolution: ±0.01 MPa\u003c\/li\u003e\n\u003cli\u003eManually rotate the top wheel to apply the pressure on testing sample, the height sensor and pressure sensor are located at the bottom.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_05_100x100.jpg?v=1785618653\" style=\"float: none;\"\u003e  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_07_100x100.jpg?v=1785619397\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe resistivity results were obtained by simultaneous pressurization and testing. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 64.4px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 64.4px;\"\u003e\u003cem\u003e\u003cbr\u003eTesting Sample, Container \u0026amp; Electrode\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 64.4px;\"\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\n\u003cul\u003e\n\u003cli\u003eTesting Powder: ≤ 40 mesh (~400 um)\u003c\/li\u003e\n\u003cli\u003eSample Container: I.D. 11.3 mm (S=1.0 cm2), Height: 0-20 mm, adjustable\u003c\/li\u003e\n\u003cli\u003eTypical Sample Types:\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_03_160x160.jpg?v=1785618100\" style=\"float: none;\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFor the four-probe testing configuration (eg: battery powders), the top electrode usually adopts the ceramic material\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_04_100x100.jpg?v=1785618653\" style=\"float: none;\"\u003e  \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan style=\"color: rgb(255, 42, 0);\"\u003eOptional\u003c\/span\u003e: when the testing powder has high hardness or large particle size, such as Petroleum Coke, Charcoal, Anthracite, the four-terminal testing system with metal top electrode is highly recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e         \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_06_100x100.jpg?v=1785618652\" style=\"float: none;\"\u003e     \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_08_160x160.jpg?v=1785619595\" style=\"float: none;\" width=\"197\" height=\"75\"\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 47.6px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 47.6px;\"\u003e\u003cem\u003eDimension\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 47.6px;\"\u003e\n\u003cul\u003e\n\u003cli\u003eL 250 * W 220 * H540 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 47.6px;\"\u003e\n\u003ctd style=\"width: 33.0935%; height: 47.6px;\"\u003e\u003cem\u003eWeight\u003c\/em\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 66.7266%; height: 47.6px;\"\u003e\n\u003cul\u003e\n\u003cli\u003e~10 kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReferences\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0008622321001482\"\u003eX. Ji, et al., High yield production of 3D graphene powders by thermal chemical vapor deposition and application as highly efficient conductive additive of lithium ion battery electrodes, Carbon, 2021, 176, 21-30.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0378775325021470\"\u003eG. J. Lian, et al., Probing carbon black deagglomeration in lithium-ion battery cathode manufacturing using powder resistivity metrics, Journal of Power Sources, 2025, 659, 238311\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"SZJG","offers":[{"title":"Default Title","offer_id":48094123720934,"sku":"EJGMFPPRT","price":9499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/6591\/1526\/files\/EJGBPMFPRT_main.jpg?v=1785610106","url":"https:\/\/echemsupplies.com\/products\/ejgmfpprt","provider":"EChem Supplies","version":"1.0","type":"link"}