Last updated 1st May 2024

ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

The methods for organizing, carrying out, evaluating, and handling the outcomes of an interlaboratory study (ILS) of a test method are covered in ASTM E691. The statistical methods covered in ASTM E691 offer sufficient details to formulate a test method's precision declaration. This approach focuses only on test procedures that produce a single numerical result as the test result, even though that single figure could derive from a computation based on several measurements.

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    Introduction to ASTM E691

    Tests on identical materials under identical conditions often yield different results due to random errors and various variables. Application variability in test methods is influenced by factors like operator, equipment, calibration, and environment. Switching laboratories can alter these elements, causing varying results and affecting the overall test method. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM E691 tests for our clients. It is important to avoid overly sanitized data in an interlaboratory investigation and to treat “poor” outcomes with undesirable assignable explanations. ASTM E691 guarantees accurate estimates of accuracy for repeatability and reproducibility and may raise concerns regarding the inclusion of such results in final estimations of precision.

    ASTM E691 Test Method 

    Ruggedness test screening procedure:

    Introducing variations into the experimentIt includes bringing about small, purposeful changes or perturbations to the experimental setup on purpose to measure the process’s sensitivity to these adjustments. 
    EvaluationThe process’s robustness and dependability can be assessed, possible sources of variability can be found, and the degree to which minor deviations affect the outcome can be ascertained by exposing it to various environments.

    ASTM E691 Test Specimens

    Specimen DetailAnything that has a measurable attribute is referred to be material. Various materials with the same property can have varying property levels or higher or lower values of the property. 
    Specimen SizeThe range of levels in the class of materials to be tested and the expected relationship between precision and level over that range will determine the number and kind of items to be included in an ILS.

    ASTM E691 Test Result

    ASTM E691 outlines procedures for organizing, conducting, evaluating, and interpreting interlaboratory study findings, ensuring uniformity and reliability across laboratories by providing recommendations for identifying variability sources.

    ASTM E691 Related Tests

    ASTM E691 is related to tests including ASTM E177 for bias and precision usage, ASTM E1169 for performing ruggedness tests, and ASTM E2282 for test results and their description.

    FAQ's

    Where can I get the astm e691 tested?

    You can share your astm e691 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm e691 test to various testing techniques.

    How much do I need to pay for the astm e691 test?

    Please contact us for a detailed quote for your astm e691 testing needs. Cost incurred to carry out different astm e691 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.

    How many samples are required for astm e691?

    The required number of samples or specimens should comply with the procedure given in the astm e691 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

    How much discount can I get on the astm e691 test?

    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.

    How many days will it take to complete the astm e691 test?

    The turnaround time for astm e691 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

    Where can I get the astm e691 tested?

    You can share your astm e691 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm e691 test to various testing techniques.

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