HYBRID EVENT: You can participate in person at Valencia, Spain or Virtually from your home or work.
Riham Hegazy, Speaker at Materials Conferences
National Institute of standards, Egypt
Title : A proposed method using t-test for stability check in proficiency testing in tensile and hardness tests of materials


The proficiency testing is very powerful tool for laboratories to continuous monitoring the validity of the results of material testing, and is considering one of the technical requirements for accreditation according to ISO 17025. Stability check for the material test samples is very important to ensure that these samples are fit for purpose, and give consistent performance over a specified period of time. The aim of this work is to propose a method for stability check using t-test as an alternative method of that followed in ISO 13528. The proposed t-test method is applied on proficiency test for Rockwell hardness test, Brinell hardness test, and tensile test for both PVC (Polyvinyl Chloride), and steel reinforcement bars. The results for stability check are analyzed, and compared with the results obtained from the convenient method of ISO 13528.

What will audience learn from your presentation?

  • The research present and verify, new method for checking the stability of material test samples
  • The material testing laborites (accredited or seeking for the accreditation) , and proficiency testing providers may interested in this new method .
  • This method is practical solution and excelled the convenient method followed by ISO 17043, and 15328. The main advantage of the proposed method using t- test is independent on the participants’ results, it depends only on the results from one lab, which perform the stability check
  • This method reduce cost, and time for the laborites, and Proficiency testing providers


Assoc Prof Dr. Riham Hegazy studied mechanical engineering at the Cairo University, Egypt and graduated as MS in 2005. She then joined the National Institute of standard, Egypt. She received her PhD degree in 2012 at the Cairo University. she obtained the position of an Associate Professor at the National Institute of standards (NIS) in 2017. She has published more than 30 research articles in Scientific journals.