Standard Reference Materials (SRM's) |
The Standards
Reference Materials Program (SRMP) funds certain projects
at NIST under which the laboratories develop and certify SRMs,
which are then made available for sale to industry. The
Surface and Microform Metrology
Group is an important participant in this program and is responsible
for developing and maintaining a wide range of SRM's.
The SRM's currently available that were developed by our Group
are as follows: |
Sinusoidal Surface Roughness Blocks (Figure 1)
|
|
SRM Number |
Description |
|
| 2073a |
3 micrometers
(nominal) roughness average (Ra), 100 micrometers
(nominal) mean profile peak spacing (RSm) |
| 2074 |
1 micrometers
Ra, 40 micrometers RSm |
| 2075 |
1 micrometers
Ra, 800 micrometers RSm |
Scanning Electron Microscope Magnification Standard (Figure 2)
|
|
SRM Number |
Description |
|
| 484g |
Line
spacings from 0.5 micrometers to 5 micrometers |
Spherical Particle Sizes (Figure 3)
|
For applications in metrology, environmental, and medicine:
|
|
SRM Number |
Description |
|
| 1691 |
0.3 micrometers
(nominal) diameter |
| 1690 |
0.9 micrometers
diameter |
| 1692 |
3 micrometers
diameter |
| 1960 |
10 micrometers
diameter |
| 1965 |
30 micrometers
diameter |
|
1965 |
Microscope slide with 10 micrometers diameter spherical
particles for use with optical microscopes |
In addition, the following materials are under active
development or redevelopment and restocking:
|
|
SRM Number |
Description |
|
| 2071b |
Sinusoidal
roughness block with 0.3 micrometers Ra and 100 micrometers
RSm |
| 2809 |
Rockwell
C calibration grade hardness indenters (Figure 4) |
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Figure 1. Photo
of SRM 2073 sinusoidal roughness block with certification
document. |
| Figure 2. Illustration
of the method of calculation of the height of a double-sided
step. |
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Figure 3. SEM
micrograph showing three particle size SRM's (0.1 micrometers,
0.3 micrometers, and 0.9 micrometers) compared with
line spacings of SRM 484. The 0.1 micrometers particle
size standard was developed by G.
Mulholland in the Building
and Fire Research Laboratory. |
| Figure 4. Measurement
with a stylus instrument of a prototype of the Rockwell C
hardness indenter, SRM 2809, currently under development. |
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Technical Contact: Dr.
Theodore V. Vorburger |
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