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A policeman is a hand-held flexible natural-rubber or plastic scraper. The common type of it is attached to a glass rod and used in chemical laboratories to transfer residues of precipitate or solid on glass surfaces when performing gravimetric analysis. This equipment works well under gentle, delicate and precise requirement. A policeman also comes in various sizes, shapes, and types. Some of them come in one-piece flexible plastic version and some in stainless. The origin of the policeman and its name cannot be identified for sure but some clues led back to the 19th century from the chemist named Carl Remigius Fresenius.

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  • Policeman (laboratory)
  • Varilla de policía
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  • A policeman is a hand-held flexible natural-rubber or plastic scraper. The common type of it is attached to a glass rod and used in chemical laboratories to transfer residues of precipitate or solid on glass surfaces when performing gravimetric analysis. This equipment works well under gentle, delicate and precise requirement. A policeman also comes in various sizes, shapes, and types. Some of them come in one-piece flexible plastic version and some in stainless. The origin of the policeman and its name cannot be identified for sure but some clues led back to the 19th century from the chemist named Carl Remigius Fresenius.
  • Una varilla de policía es un raspador flexible o espátula, generalmente de caucho natural,​ unido a una varilla de vidrio​ utilizada en los laboratorios de química para la transferencia de residuos sólidos de un precipitado o en superficies de vidrio cuando se realiza un análisis gravimétrico.​ Las varillas de policía también se fabrican en versiones de una sola pieza de plástico flexible, como teflón, polietileno o polipropileno.​ No son iguales que los .
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  • Una varilla de policía es un raspador flexible o espátula, generalmente de caucho natural,​ unido a una varilla de vidrio​ utilizada en los laboratorios de química para la transferencia de residuos sólidos de un precipitado o en superficies de vidrio cuando se realiza un análisis gravimétrico.​ Las varillas de policía también se fabrican en versiones de una sola pieza de plástico flexible, como teflón, polietileno o polipropileno.​ No son iguales que los . Las varilla de policía también se utilizan en los laboratorios biológicos, para la transferencia de células de tejidos en cultivo desde una placa a una suspensión para, por ejemplo, división de las células o preparación de lisados celulares. En realidad, el nombre se aplica a la goma que se coloca en el extremo de la varilla y su principal función es evitar rallar el recipiente de vidrio si se rascase directamente con el vidrio.​​
  • A policeman is a hand-held flexible natural-rubber or plastic scraper. The common type of it is attached to a glass rod and used in chemical laboratories to transfer residues of precipitate or solid on glass surfaces when performing gravimetric analysis. This equipment works well under gentle, delicate and precise requirement. A policeman also comes in various sizes, shapes, and types. Some of them come in one-piece flexible plastic version and some in stainless. The origin of the policeman and its name cannot be identified for sure but some clues led back to the 19th century from the chemist named Carl Remigius Fresenius.
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