What is the difference for Medical face mask Air different pressure tester standard from EN14683:2004 to EN14683:2019

All we know the medical face mask has to test the Breathability(differential pressure), which is the delta P value. The standard of EN14683 required this device which measures the differential pressure to draw air through a measured surface area at a constant air flow rate is used to measure the air exchange pressure of the medical face mask material. A water-filled(or digital) differential manometer is used to measure the differential pressure. A mass flow meter is used for measurement of the airflow.

However, the standard of EN14683:2004 has been replaced by EN14683:2019 version, for air flow leakage issue, the standard propose higher requests for assuring testing result accuracy. Let us see which requests has been highlighted by EN14683:2019:

1. The internal diameter of the top holder and the bottom holder in the contact area with the filter material shall be (25+/-1)mm.

2. The seal of the top and bottom holder onto the filter material shall consist of a metal-metal contact. A metallic ring of internal diameter of (25+/-1)mm and ca.3mm thick will be fixed to the top holder. The bottom holder will consist of a completely flat metallic surface with an internal diameter of (25+/-1)mm and a 3mm area around the open diameter. Materials such as rubber or poly foam do not provide a sufficient seal and may deform into the test area.

3. Validation of the test apparatus shall consist of a leak test. A second flow meter placed immediately before the valve will allow for evaluation of an air leak within the test apparatus. With the sample holder closed, start the pump and adjust the flow meter to read 8l/min on the first flow meter. If no leaks are present both flow meters should read 8l/min.

Another check shall consist of stopping inlet air when both flow meters give 8l/min. After a few seconds both flow meters should indicate 0l/min if no leaks.

QINSUN G285 is totally complied with above new requirements, for more information, please check the product catalog here.

QINSUN G285 air difference pressure

此博客中的热门博文

Moisture Management Test Method -AATCC 195

MMT textile moisture management tester Test Method -AATCC 195 is for the measurement, evaluation and classification of liquid moisture management properties of textile fabrics. The test method produces objective measurements of liquid moisture management properties of knitted, woven and nonwoven textile fabrics. The test method produces objective measurements of liquid moisture management properties of knitted, woven, and nonwoven textile fabrics. The results obtained with this test method are based on water resistance, water repellency, and water absorption characteristics of the fabric structure, including the fabric's geometric and internal structure and the wicking characteristics of its fibers and yarns. The results obtained with this test method are based on water resistance, water repellency and water absorption characteristics of the fabric structure, including the fabric's geometric and internal structure and the wicking characteristics of its fibers and yarns.

阅读全文

The Leather Friction Color Fastness Tester

Leather friction color fastness tester applied to test leather property in shoes, clothing, luggage handbag industry, research laboratories; commodity inspection, arbitration and technical supervision departments.Leather friction color fastness tester test the degree of decolorization of dyeing leather after friction. It can used to test the leather color resistance to dry, wet and friction. This instrument is suitable for leather, textile, belt, trademarks, cardboard and other friction materials by foreign object damage and decoloring. The machine is designed to carry out a rub fastness test on the surface of leather or coated fabrics to determine the marring of the surface finish and to assess the amount of color transfer from the sample to the rubbing pad. This machine is designed to determining the colorfastness of leather, plastics and textile materials. The colorfastness is assessed by checking change in color of the specimen and stain of the felt after rubbing the

阅读全文

How Sublimation Fastness Tester Works?

Sublimation Fastness Tester is a suitable instrument for dyestuff manufacturers as well as textile processors for checking effects of dry heat on dyestuff. Qinsun-lab offers Sublimation Fastness Tester of the best quality and at the best price which gives accurate results. Features of Sublimation Fastness Tester : Testing the effect of direct heat on the dyestuff； up to 250°C temperature range； Independent digital timers with the minimum display of 1℃(one with each of top and bottom plates, respectively)； Can test entire range of temperature in a single test. Working Principle: A dyed cloth piece is sandwiched between two undyed pieces and placed to cover the heat pads and the test goes on for a preset time period. The fabric pieces should be picked up immediately. The undyed fabric pieces will be stained by the dyes. This gives the sublimation fastness properties for the range of temperature 130°C to 250°C in one test. A rea

阅读全文

Testile Testing Equipment, Textile Testing Products, Retail Textile Testing Standards.

搜索此博客