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AATCC is the world’s leading not-for-profit association serving textile professionals since 1921. AATCC is headquartered in Research Triangle Park, N.C., USA, providing test method development, quality control materials, and professional networking for thousands of members in 60 countries throughout the world.
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Textile Standards ASTM International is one of the largest voluntary standards development organizations in the world-a trusted source for technical standards for materials, products, systems, and services. Known for their high technical quality and market relevancy, ASTM International standards have an important role in the information infrastructure that guides design, manufacturing and trade in the global economy. Committee D13 ASTM Committee D13 on Textiles was formed in 1914. D13 meets twice a year, in January and June, with approximately 100 members attending three days of technical meetings. The Committee has 535 members and currently has jurisdiction of 339 standards, published in the Annual Book of ASTM Standards, Volumes 7.01 and 7.02.

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Madras, India
A textile technologist, chemist to be more precise. Have taken up responsibilities with AATCC and ASTM International to provide technical and support services to members and member prospects. Involved in QA systems implementation for Textile producers. Work with some of the top rated technicians in the world. We are Rated very highly Globally. I share my knowledge and experience ( Episteme and Techne)with the industry. Conduct Training programs for AATCC and ASTM Intl. In addition design and deliver tailor made programs and deliver lectures. Love to drive in search of desolate and exotic locations, where the air is clean , water in pure and nature is still natural. Ironically I Love gadgets and gizmo's and experimenting with new hardware and software. Life is not perfect , but it is interesting. Imperfections make life worth living. A perfect system is no challenge to the body , mind and soul.

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Friday, May 8, 2009

Diaphragm Tare in Mullen Burst Testers – Important Information

MULLEN® DIAPHRAGM TARE VALUE and  HEIGHT BRIDGE GAUGE TO VERIFY THIS

Diaphragm performance is vital to consistent and reliable test results, which is why it should be checked and changed regularly. A Mullen® diaphragm height gauge, which allows you to verify distension, will help determine when a diaphragm has exceeded its useful life.

Mullen® Model C tester  should be aware that the Rubber Diaphragm has a known Tare value of 3.5 to 5.5 PSI.

This value will be specified on the pack of Diaphragm if they are original Mullen Diaphragms.

  • This Tare Value has to be deducted from the recorded sample Burst Value,
  • To arrive at the actual sample burst value.

Verification of the Rubber Diaphragm

The Rubber diaphragm over a period of time loses its elasticity and hence the tare value will change.

In order to verify if the diaphragm’s tare value is within range as well as to determine the time when it has to be changed Mullen® Testers sell a diaphragm height Gauge

clip_image002Using the Diaphragm Height Gauge to verify the Tare value

All you do is place the height gauge on the diaphragm plate (lower plate – do not place any material in the clamping area) and distend the diaphragm up to the bottom of the height gauge – the gauge should have a reading.  Depending on the specification of the diaphragm, it should read between the diaphragm specification (for example #520 diaphragm used in Model C specification is 3.5 to 5.5 PSI).  If the gauge reading does not agree with the diaphragm  specification, the diaphragm is out of specification and should be replaced

 

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