{"id":8687,"date":"2020-09-14T15:52:21","date_gmt":"2020-09-14T13:52:21","guid":{"rendered":"https:\/\/consilab.de\/?page_id=8687"},"modified":"2022-07-08T10:51:02","modified_gmt":"2022-07-08T08:51:02","slug":"specific-powder-resistivity","status":"publish","type":"page","link":"https:\/\/consilab.de\/en\/benefits\/parameters-for-substances\/specific-powder-resistivity\/","title":{"rendered":"Specific powder resistivity"},"content":{"rendered":"

[vc_row rt_row_background_width=”fullwidth” rt_row_content_width=”default” rt_row_style=”default-style” rt_row_borders=”” rt_row_shadows=”” rt_row_paddings=”false” rt_bg_effect=”classic” rt_bg_image_repeat=”repeat” rt_bg_size=”cover” rt_bg_position=”right top” rt_bg_attachment=”scroll” rt_bg_video_format=”self-hosted”][vc_column width=”1\/3″ rt_column_shadow=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_attachment=”scroll” class=”download” rt_bg_color=”” rt_bg_overlay_color=”” offset=”vc_hidden-sm vc_hidden-xs” css=”.vc_custom_1532422018913{padding-bottom: 0px !important;}” rt_padding_bottom=”0″][vc_widget_sidebar sidebar_id=”rt-theme-20-common-sidebar”][\/vc_column][vc_column width=”2\/3″ rt_column_shadow=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_attachment=”scroll” class=”maincontent” rt_bg_color=”” rt_bg_overlay_color=”” css=”.vc_custom_1532422014773{padding-bottom: 2em !important;}”][vc_column_text el_class=”redborderleft”]<\/p>\n

Specific powder resistivity<\/h1>\n

Powders can become electrostatically charged when bulk materials are handled, e.g. during pneumatic transport or even during simple decanting processes.<\/h2>\n

This can lead to dangerous discharges, e.g. in the form of cone discharges. However, these cone discharges can only form if the dust or powder is electrostatically insulating. If, on the other hand, the specific powder resistivity is\u00a0 <\u00a01010\u00a0<\/sup>\u2126m, cone discharges can be excluded.<\/p>\n

Identifying the powder resistivity allows the electrostatic properties of the powder to be analyzed and suitable safety precautions to be defined and taken.<\/p>\n

The specific powder resistance of bulk material is identified in accordance with DIN EN 60079-32-2 (December 2015) – Electrostatic hazard test method using a Tera Ohmmeter TO3 by means of a powder electrode. To measure resistance, the test substance is placed in a powder measuring cell. This measuring cell consists of two conductive metal electrodes facing each other at a distance of 10 mm, and which are embedded in a Teflon body. The test subject is poured into the space between the metal electrons and scraped with a spatula.<\/p>\n

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Next, the powder electrode is closed with a lid and the measurement is performed. The bulk density is identified from the volume of the space between the electrodes and the mass of the test substance. Depending on the specific resistance, the measuring voltage can be, for example, 100 V or 500 V. The resistance of the bulk material is determined and the temperature and humidity are noted.<\/p>\n

Taking the volume of the measuring cell (height, length, distance between the electrons) into consideration, the specific powder resistivity is identified.<\/p>\n

A substance or material is classified according to its specific resistivity \u03c1 in accordance with TRGS 727 as follows:<\/p>\n

Conductive:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u03c1 \u2264 104<\/sup>\u00a0\u03a9m<\/p>\n

Dissipative:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 104<\/sup> \u03a9m < \u03c1 <109<\/sup>\u03a9m<\/p>\n

Insulating:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 109<\/sup> \u03a9m\u00a0\u2264 \u03c1<\/p>\n

The following limit values apply to bulk materials as defined in TRGS 727:<\/p>\n

Low specific resistance:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u03c1 \u2264 106<\/sup>\u00a0\u03a9m<\/p>\n

Medium specific resistance:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 106<\/sup> \u03a9m\u00a0< \u03c1 \u22641010<\/sup>\u00a0\u03a9m<\/p>\n

High specific resistance:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1010<\/sup> \u03a9m\u00a0< \u03c1<\/p>\n

[\/vc_column_text][vc_row_inner rt_row_style=”global-style” rt_bg_custom_alignment=”top”][vc_column_inner width=”1\/2″ rt_column_shadow=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_attachment=”scroll”][vc_btn title=”Parameters for substances” style=”classic” color=”purple” i_icon_fontawesome=”fas fa-angle-left” add_icon=”true” link=”url:%2Fen%2Fbenefits%2Fparameters-for-substances%2F” el_class=”btn–red”][\/vc_column_inner][vc_column_inner width=”1\/2″ rt_column_shadow=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_attachment=”scroll”][vc_btn title=”Benefits” style=”classic” color=”purple” i_icon_fontawesome=”fas fa-angle-left” add_icon=”true” link=”url:%2Fen%2Fbenefits%2F|title:Benefits” el_class=”btn–red”][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row]<\/p>\n","protected":false},"excerpt":{"rendered":"

[vc_row rt_row_background_width=”fullwidth” rt_row_content_width=”default” rt_row_style=”default-style” rt_row_borders=”” rt_row_shadows=”” rt_row_paddings=”false” rt_bg_effect=”classic” rt_bg_image_repeat=”repeat” rt_bg_size=”cover” rt_bg_position=”right top” rt_bg_attachment=”scroll” rt_bg_video_format=”self-hosted”][vc_column width=”1\/3″ rt_column_shadow=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_attachment=”scroll” class=”download” rt_bg_color=”” rt_bg_overlay_color=”” offset=”vc_hidden-sm vc_hidden-xs” css=”.vc_custom_1532422018913{padding-bottom: 0px !important;}” rt_padding_bottom=”0″][vc_widget_sidebar sidebar_id=”rt-theme-20-common-sidebar”][\/vc_column][vc_column width=”2\/3″ rt_column_shadow=”” rt_bg_image_repeat=”repeat” rt_bg_size=”auto auto” rt_bg_attachment=”scroll” class=”maincontent” rt_bg_color=”” rt_bg_overlay_color=”” css=”.vc_custom_1532422014773{padding-bottom: 2em !important;}”][vc_column_text el_class=”redborderleft”] Specific powder resistivity Powders can become electrostatically charged when bulk materials are …
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