**Specifications for**

**Testing Coefficient of Thermal Expansion (CTE)**

# Section A. Requirements For Testing Ultra Low Expansion (ULE) Samples

1)  Temperature Measurement

    a.  Thermal distortion tests ("distortion" is used here to represent
        either expansion or contraction, as appropriate) are to be run
        between a low temperature of no warmer than 30 K (Kelvin) and a
        high temperature of no warmer than room temperature (nominally
        293 K).

    b.  Calibration data for the temperature sensors used during testing
        shall be a deliverable item.

    c.  A minimum of two temperature sensors shall be mounted on each
        sample. Vendor shall provide evidence that the temperature
        sensors and their mounting methods will not adversely affect the
        thermal distortion behavior of the samples.

    d.  Vendor shall assure no temperature gradients greater than 1.0 K
        exist in the test samples when distortion data are recorded.

    e.  Vendor shall be able to measure sample temperature with an
        accuracy of +/- 0.5 K or better. Vendor shall state the accuracy
        to which sample temperature can be measured.

    f.  If other materials are used as a comparative reference during
        testing, temperature of these references shall be recorded
        whenever distortion and sample temperature data are recorded.

2)  Room Temperature Length Measurement

    a.  Vendor shall be able to measure sample length (in measurement
        direction, as shown in Figure 2) at room temperature with an
        accuracy of +/- 0.0001 inch or better. Vendor shall state the
        accuracy to which sample length can be measured at room
        temperature.

3)  Distortion Measurement

    a.  Thermal distortion shall be measured in the 1.0-inch direction
        of the 1.0 x 1.0 x 0.175 inch samples (see Figure 2).

    b.  The distortion of each sample shall be measured over the
        temperature range given in 1a above with an accuracy goal of +/-
        5x10^-6^ inch or better.

    c.  Vendor shall state, in microinches, to what accuracy the
        distortion can be measured of a ULE sample which is 1.0 inch
        long in the measurement direction over the temperature range
        given in 1a above using the proposed equipment and methods.

    d.  Vendor shall state whether the accuracy of distortion
        measurements varies with sample length and, if so, quantify the
        accuracy versus sample length.

    e.  Vendor shall state whether the accuracy of distortion
        measurements varies with temperature and, if so, quantify the
        accuracy versus temperature.

4)  Data Reporting

    a.  Vendor shall record the room temperature length of each sample
        before and after it is cryo cycled.

    b.  Vendor shall record temperature and distortion data no less
        often than at every 5 K temperature change between the lowest
        temperature reached and 100 K, and no less often than at every
        10 K change between 100 K and room temperature.

    c.  As a minimum, temperature and distortion data shall be taken
        either during the cool-down phase [or]{.underline} during the
        warm-up phase. If the vendor chooses, temperature and distortion
        data may be recorded during both the cool-down phase and the
        warm-up phase.

    d.  Vendor shall deliver a final report containing descriptions and
        illustrations of test setup as appropriate, test procedures,
        results, and conclusions.

5)  Other

    a.  Vendor shall provide any available data on tests which have been
        performed on calibrated CTE standards (NIST, NBS, etc.) using
        the same test apparatus and test procedures used for this
        testing.

    b.  Vendor shall provide any available data on tolerances and error
        contributions of the specific test apparatus and procedures used
        for this testing.

    c.  To assure repeatability in the test apparatus and procedures,
        the first sample or set of samples shall be tested completely,
        removed from the test apparatus, reinstalled, and tested
        completely again. By comparing the results the vendor shall show
        the level of repeatability which can be achieved with the test
        apparatus.

    d.  Alternate approaches or requirement levels may be proposed and
        will be assessed in light of the evaluation criteria and
        requirements listed here.

    e.  Shall use applicable ASTM Standard Test Method for Linear
        Thermal Expansion

# Deliverable Items

1)  Temperature sensor calibration data

2)  Analysis of temperature sensor effects on test sample

3)  Statement of temperature measurement accuracy as a function of
    temperature between room temperature and 30 K

4)  Statement of room temperature sample length measurement accuracy

5)  Statement of distortion measurement accuracy for a 1.0-inch ULE
    sample, in microinches, for a temperature change from room
    temperature to 30 K.

6)  Statement of how distortion measurement accuracy varies with sample
    length, if any

7)  Statement of how distortion measurement accuracy varies with sample
    temperature, if any

8)  Pre- and post-cryo cycle room temperature length of each specimen

9)  Distortion vs. temperature data for each test of each specimen,
    including any temperature data for comparative references if they
    are used

10) Any available calibration of the test apparatus against standards
    (NIST, NBS, etc.)

11) Any available tolerance and error contributions of test apparatus
    and procedures

12) Final report: ULE to be tested first (before Be) due to sample
    availability. Final ULE report (summary of tabulated data, charts,
    graphs, textual summary with findings and conclusion) due two weeks
    following completion of final test run. Additionally, a weekly
    preliminary report (tabulated data sufficient) is due to MSFC by
    Tuesday each week for runs completed by the previous Friday (email,
    fax, etc.).

13) Return of all samples

+------------------------------------------------------------+---------+
| **ULE CTE Testing Evaluation Criteria**                    | ##      |
|                                                            |  Points |
+------------------------------------------------------------+---------+
| 1)    Temperature Measurement                              |         |
+------------------------------------------------------------+---------+
| Low temperature no warmer than 30 K (colder is better)     | 2       |
+------------------------------------------------------------+---------+
| Provide calibration data for temperature sensors           | 5       |
+------------------------------------------------------------+---------+
| Minimum two temperature sensors per sample (more is better | 5       |
| if there is no effect on sample behavior)                  |         |
+------------------------------------------------------------+---------+
| Analysis/evidence that temperature sensors do not affect   | 7       |
| thermal distortion behavior of samples                     |         |
+------------------------------------------------------------+---------+
| No temperature gradients in samples greater than 1.0 K     | 8       |
| (smaller is better)                                        |         |
+------------------------------------------------------------+---------+
| Measure sample temperature with accuracy of +/- 0.5 K or   | 8       |
| better (smaller is better)                                 |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 2)    Room Temperature Length Measurement                  |         |
+------------------------------------------------------------+---------+
| Measure sample at room temperature with accuracy of +/-    | 2       |
| 0.0001 inch or better (smaller is better)                  |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 3)    Distortion Measurement                               |         |
+------------------------------------------------------------+---------+
| Measure distortion with accuracy goal of +/- 5x10^-6^ inch | 30      |
| or better (smaller is better)                              |         |
+------------------------------------------------------------+---------+
| Quantify distortion measurement accuracy versus sample     | 8       |
| length variation                                           |         |
+------------------------------------------------------------+---------+
| Quantify distortion measurement accuracy versus            | 8       |
| temperature variation                                      |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 4)    Data Reporting                                       |         |
+------------------------------------------------------------+---------+
| Record temperature/distortion data both warm-to-cold and   | 4       |
| cold-to-warm (optional)                                    |         |
+------------------------------------------------------------+---------+
| Record temp/distortion at least every 5 K for coldest to   | 3       |
| 100 K, at least every 10 K for 100 K to room temp (more    |         |
| often is better)                                           |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 5)    Other                                                |         |
+------------------------------------------------------------+---------+
| Test data on calibrated CTE standards                      | 5       |
+------------------------------------------------------------+---------+
| Tolerances/error contributions of test apparatus and       | 5       |
| procedures                                                 |         |
+------------------------------------------------------------+---------+
| **Total**                                                  | 100     |
+------------------------------------------------------------+---------+

# ULE CTE Test Specimen Details - Rev. D, 17 May 02

(1/4 inch thick, with chamfers)

![](media/image1.wmf){width="5.995138888888889in"
height="4.279166666666667in"}

# Section B. Requirements For Testing Beryllium 0-30H (Be) 

1)  Temperature Measurement

    a.  Thermal distortion tests ("distortion" is used here to represent
        either expansion or contraction, as appropriate) are to be run
        between a low temperature of no warmer than 30 K (Kelvin) and a
        high temperature of no warmer than room temperature (nominally
        293 K).

    b.  Calibration data for the temperature sensors used during testing
        shall be a deliverable item.

    c.  A minimum of two temperature sensors shall be mounted on each
        sample. Vendor shall provide evidence that the temperature
        sensors and their mounting methods will not adversely affect the
        thermal distortion behavior of the samples.

    d.  Vendor shall assure no temperature gradients greater than 1.0 K
        exist in the test samples when distortion data are recorded.

    e.  Vendor shall be able to measure sample temperature with an
        accuracy of +/- 0.5 K or better. Vendor shall state the accuracy
        to which sample temperature can be measured.

    f.  If other materials are used as a comparative reference during
        testing, temperature of these references shall be recorded
        whenever distortion and sample temperature data are recorded.

2)  Room Temperature Length Measurement

    a.  Vendor shall be able to measure sample length (in measurement
        direction, as shown in Figure 1) at room temperature with an
        accuracy of +/- 0.0001 inch or better. Vendor shall state the
        accuracy to which sample length can be measured at room
        temperature.

3)  Distortion Measurement

    a.  Thermal distortion shall be measured in the 1.5-inch direction
        of the 1.5 x 1.75 x 0.125 inch samples (see Figure 1).

    b.  The distortion of each sample shall be measured over the
        temperature range given in 1a above with an accuracy goal of +/-
        5x10^-6^ inch or better.

    c.  Vendor shall state, in microinches, to what accuracy the
        distortion can be measured of a beryllium sample which is 1.5
        inch long in the measurement direction over the temperature
        range given in 1a above using the proposed equipment and
        methods.

    d.  Vendor shall state whether the accuracy of distortion
        measurements varies with sample length and, if so, quantify the
        accuracy versus sample length.

    e.  Vendor shall state whether the accuracy of distortion
        measurements varies with temperature and, if so, quantify the
        accuracy versus temperature.

4)  Data Reporting

    a.  Vendor shall record the room temperature length of each sample
        before and after it is cryo cycled.

    b.  Vendor shall record temperature and distortion data no less
        often than at every 5 K temperature change between the lowest
        temperature reached and 100 K, and no less often than at every
        10 K change between 100 K and room temperature.

    c.  As a minimum, temperature and distortion data shall be taken
        either during the cool-down phase [or]{.underline} during the
        warm-up phase. If the vendor chooses, temperature and distortion
        data may be recorded during both the cool-down phase and the
        warm-up phase.

    d.  Vendor shall deliver a final report containing descriptions and
        illustrations of test setup as appropriate, test procedures,
        results, and conclusions.

5)  Other

    a.  Vendor shall provide any available data on tests which have been
        performed on calibrated CTE standards (NIST, NBS, etc.) using
        the same test apparatus and test procedures used for this
        testing.

    b.  Vendor shall provide any available data on tolerances and error
        contributions of the specific test apparatus and procedures used
        for this testing.

    c.  To assure repeatability in the test apparatus and procedures,
        the first sample or set of samples shall be tested completely,
        removed from the test apparatus, reinstalled, and tested
        completely again. By comparing the results the vendor shall show
        the level of repeatability which can be achieved with the test
        apparatus.

    d.  Alternate approaches or requirement levels may be proposed and
        will be assessed in light of the evaluation criteria and
        requirements listed here.

    e.  Shall use applicable ASTM Standard Test Method for Linear
        Thermal Expansion

# Deliverable Items

1)  Temperature sensor calibration data

2)  Analysis of temperature sensor effects on test sample

3)  Statement of temperature measurement accuracy as a function of
    temperature between room temperature and 30 K

4)  Statement of room temperature sample length measurement accuracy

5)  Statement of distortion measurement accuracy for a 1.5-inch Be
    sample, in microinches, for a temperature change from room
    temperature to 30 K.

6)  Statement of how distortion measurement accuracy varies with sample
    length, if any

7)  Statement of how distortion measurement accuracy varies with sample
    temperature, if any

8)  Pre- and post-cryo cycle room temperature length of each specimen

9)  Distortion vs. temperature data for each test of each specimen,
    including any temperature data for comparative references if they
    are used

10) Any available calibration of the test apparatus against standards
    (NIST, NBS, etc.)

11) Any available tolerance and error contributions of test apparatus
    and procedures

12) Reports Required: Be testing to follow ULE testing and, as required
    before, a final report (summary of tabulated data, charts, graphs,
    textual summary with findings and conclusion) due to MSFC two weeks
    following completion of final test run. As with ULE, a weekly
    preliminary report (tabulated data sufficient) is due to MSFC by
    Tuesday each week for runs completed by the previous Friday (email,
    fax, etc.).

13) Return of all samples

+------------------------------------------------------------+---------+
| **Be CTE Testing Evaluation Criteria**                     | ##      |
|                                                            |  Points |
+------------------------------------------------------------+---------+
| 1)    Temperature Measurement                              |         |
+------------------------------------------------------------+---------+
| Low temperature no warmer than 30 K (colder is better)     | 2       |
+------------------------------------------------------------+---------+
| Provide calibration data for temperature sensors           | 5       |
+------------------------------------------------------------+---------+
| Minimum two temperature sensors per sample (more is better | 5       |
| if there is no effect on sample behavior)                  |         |
+------------------------------------------------------------+---------+
| Analysis/evidence that temperature sensors do not affect   | 7       |
| thermal distortion behavior of samples                     |         |
+------------------------------------------------------------+---------+
| No temperature gradients in samples greater than 1.0 K     | 8       |
| (smaller is better)                                        |         |
+------------------------------------------------------------+---------+
| Measure sample temperature with accuracy of +/- 0.5 K or   | 8       |
| better (smaller is better)                                 |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 2)    Room Temperature Length Measurement                  |         |
+------------------------------------------------------------+---------+
| Measure sample at room temperature with accuracy of +/-    | 2       |
| 0.0001 inch or better (smaller is better)                  |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 3)    Distortion Measurement                               |         |
+------------------------------------------------------------+---------+
| Measure distortion with accuracy goal of +/- 5x10^-6^ inch | 30      |
| or better (smaller is better)                              |         |
+------------------------------------------------------------+---------+
| Quantify distortion measurement accuracy versus sample     | 8       |
| length variation                                           |         |
+------------------------------------------------------------+---------+
| Quantify distortion measurement accuracy versus            | 8       |
| temperature variation                                      |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 4)    Data Reporting                                       |         |
+------------------------------------------------------------+---------+
| Record temperature/distortion data both warm-to-cold and   | 4       |
| cold-to-warm (optional)                                    |         |
+------------------------------------------------------------+---------+
| Record temp/distortion at least every 5 K for coldest to   | 3       |
| 100 K, at least every 10 K for 100 K to room temp (more    |         |
| often is better)                                           |         |
+------------------------------------------------------------+---------+
|                                                            |         |
+------------------------------------------------------------+---------+
| 5)    Other                                                |         |
+------------------------------------------------------------+---------+
| Test data on calibrated CTE standards                      | 5       |
+------------------------------------------------------------+---------+
| Tolerances/error contributions of test apparatus and       | 5       |
| procedures                                                 |         |
+------------------------------------------------------------+---------+
| **Total**                                                  | 100     |
+------------------------------------------------------------+---------+

### Beryllium CTE Test Specimen Details - Rev. C, 19 April 02

(1/4 inch thick)

![](media/image2.wmf){width="5.990972222222222in"
height="3.6215277777777777in"}

# Period of Performance

This procurement shall be referred to as the first-round of CTE testing
for Be and ULE. The period of performance for the first-round of testing
shall be from effective date of award through November 29, 2002.

If performance proves acceptable, it is possible that funding might be
available for additional CTE testing of the same types of materials or
different materials. This will be referred to as the second-round of
testing. The period of performance for the second-round of testing shall
be from the end of the first-round through November 30, 2003.