NIST
[skip navigation]National Institute of Standards and TechnologyNational Institute of Standards and Technology - TimeNational Institute of Standards and Technology - Home PageNational Institute of Standards and Technology - About NISTNational Institute of Standards and Technology - Contact UsNational Institute of Standards and Technology - A-Z Site IndexNIST Physical Measurement LaboratoryPML Semiconductor & Dimensional Metrology DivisionSDMD Dimensional Metrology GroupSDMD Surface & Nanostructure Metrology GroupSDMD Nanoscale Metrology GroupSDMD Nanoelectronics GroupSDMD Advanced Device Reliability & Characterization Group
  ENGINEERING METROLOGY TOOLBOX  
 Temperature Tutorial 
 Slide 11 

Temperature Tutorial is a web-based tutorial about effects of temperature on dimensional measurements.

Temperature Tutorial
Slide 11

First SlidePrevious SlideNext SlideLast SlideTemperature Tutorial IndexEngineering Metrology Toolbox Home

Reference Values

Next is the question of where to get the value of the CTE for a specific material. There are a large number of reference books that give values for the CTE, and a number of WEB sites that are useful. At the end of this tutorial we have made a list of sources that can be helpful.

There are two problems with most, if not all sources, of reference data.

First, there is no estimate of the uncertainty of the values in the tables. This includes the uncertainty of the measurement as well as the batch to batch variation in a given material. Even fairly well defined materials, such as ANSI numbered steels, still have ranges of the various components in the material. Luckily, most heat treatments do not change the CTE radically, but there are very few sources that provide data to help us with that conclusion.

Secondly, nearly all tables give the CTE as the average over some temperature range. In many cases you have to read the tables and footnotes carefully to find the applicable temperature range. An example of the problems in this area is shown in the next page.

First SlidePrevious SlideNext SlideLast SlideTemperature Tutorial IndexEngineering Metrology Toolbox Home
Return to Top of Slide
Return to Top of Document

Web Site Home: Engineering Metrology Toolbox
Technical Inquiries: Daniel S. Sawyer, Group Leader
Dimensional Metrology
Semiconductor and Dimensional Metrology Division
Physical Measurement Laboratory
NIST, 100 Bureau Drive, Stop 8211, Gaithersburg, MD 20899-8211

The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.
NIST / PML / Semiconductor and Dimensional Metrology Division

NIST Program Questions: Public Inquires Unit
(301) 975-NIST (6478) TTY (301) 975-8295
NIST, 100 Bureau Drive, Stop 3460, Gaithersburg, MD 20899-3460

Privacy Policy / Security Notice / Accessibility Statement / Disclaimer / Freedom of Information Act (FOIA) / 
Environmental Policy Statement / No Fear Act Policy / ExpectMore.gov (performance of federal programs) / 
NIST Information Quality Standards / Scientific Integrity Summary

Date Created: Monday, October 15, 2001
Last Updated: Tuesday, November 09, 2004
Technical Web Site Questions: Jay Zimmerman
Feedback and Comments: Webmaster