Overview of Outgas Data List
This section comprises excerpts from chapter 2 of
"Collection of Data on Outgas of Organic Materials for Space Use, NASDA-HDBK-1A"
1999, NASDA. The selected excerpts represent portions that are closely
associated in ensuring smooth operation of this material database and have
been reconstructed. If crosschecking of the following data is needed, please
see the original reference, although it is written in Japanese.
0. Introduction
This collection of outgas data summarizes data collected
by NASDA since September 1980. As a rule, data is collected under "standard"
conditions conforming to ASTM E 595. However, some data have been
collected under "non-standard" conditions that do not conform to
ASTM E 595, concerning, for example, samples, test temperature,
duration and degree of vacuum. When using data, please check whether data
was collected under "standard" or "non-standard" conditions.
1. Data List
The data list contains date when measurement was
started, material name (product name), raw material, temperature, duration,
atmosphere, adjusted date, other conditions, manufacturer, material provider,
outgas data (TML, CVCM and WVR), condensation
level, condensed material thickness vs time, IR, IR spectrum,
REPORT No., use, comments,
film thickness value and "standard/non-standard" division.
The main description items are explained below.
(1) Definition of
Outgas Data
a. Total mass loss (TML)
{(Sample weight before test
- Sample weight after test)/Sample weight before test} ~ 100 (%)
b. Collected volatile condensable material (CVCM)
{(Collector plate weight after
test - Collector plate weight before test)/Sample weight before test} ~
100 (%)
c. Water vapor regained (WVR)
{(Sample weight after moisture
absorption* -(Sample weight after test)/Sample weight before test} ~ 100
(%)
*: Weight after storing 24 hours at 23}1C
and 50%RH.
(2) Condensation
a) Deposition condition of a recondensate is measured
by a film thickness gauge as aging variation of film thickness. The density
of condensates needed for film thickness calculations is uniformly hypothesized
as 1.
b) The column "Deposition" is written with film
thickness values in nm after heating 24 hours.
Blank
column: Deposition data was not measured.
(3) IR
This column describes results obtained by depositing
recondensate on a KBr plate (or rock salt plate) during outgas measurement
and by measuring an IR spectrum by an infrared spectrophotometer after
a test.
(4) REPORT No.
A document number of the outgas measurement report
describing measurement results of a material is written. Document numbers
of outgas measurement reports are prefixed by "TK-G-" or "TK-PG-" to numerals
in five digits. The first two numerals represent the year in which measurement
is made and the subsequent three numerals, a serial number for each year.
(5) Use
The use is written in accordance with sample ID cards
submitted by material providers. These uses, therefore, do not necessarily
indicate general uses.
(6) Comments
Measurement data under "non-standard" conditions
is classified as follows:
"*1" :
Data, whose measurement did not perfectly comply
with ASTM E 595 but which can be judged equal to data compliant
to ASTM E 595 in handling data, is marked "*1."
For example, cases where an initial sample weight
of a low-density material or other material does not meet a reference value
(200 to 300mg) or where a substrate weight cannot be calculated in a test
of a coating material including the substrate are *1 data.
"*2" :
Data of measured samples, whose measurement did not
comply with ASTM E 595 and which should be separated from data that
is compliant to ASTM E 595 in handling data, is marked "*2." For
example, "*2" would be marked, if the number of samples measured is not
three, if sample weights include portions which are not included as a measurement
object and cannot be separated in actual measurement and in calculations,
and if a large-diameter sample chamber deviating from the ASTM E 595
specification is used.
"*3" :
Data of samples, whose measurement conditions did
not comply with ASTM E 595 and which should be separated from data
that is compliant to ASTM E 595, in handling data, is marked "*3."
For example, "*3" is marked where heating temperature, recondensate temperature,
test duration, degree of vacuum or other parameters differ from the ASTM
E 595 specification or when samples are weighed by a balance whose
accuracy is lower than a micro electronic force balance which is normally
used.
2. Data Values
(1) Digits
The outgas measurement report provides data up to
the third place after the decimal point (up to the second place for some
of the data collected in 1980 and 1981). This data collection rounds off
the third place and provides data to the second place.
(2) Standard Deviation
Values marked "}" following data values are standard
deviations of three samples.
(3) Not measured
Blank columns or columns marked "-" indicate that
measurement was not taken for the items.
(4) Error
The TML, CVCM and WVR values are calculated based
on weight variations and contain errors caused by weighing. Therefore,
if a recondensate hardly existed, some values were minus values due to
measurement error.