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.