ASTM E595-15
在真空环境中除气作用引起的总质量损失和收集到的挥发性可凝聚材料的标准试验方法

Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment

被代替

ASTM E595-15 发布历史

ASTM E595-15由美国材料与试验协会 US-ASTM 发布于 2015。

ASTM E595-15 发布之时，引用了标准

• ASTM E177 进行室外噪声测量的测量方案的拟定用标准指南

ASTM E595-15的历代版本如下：

• 2021年 ASTM E595-15(2021) 在真空环境中排放的总质量损失和收集的挥发性可冷凝材料的标准测试方法
• 2015年 ASTM E595-15 在真空环境中除气作用引起的总质量损失和收集到的挥发性可凝聚材料的标准试验方法
• 2007年 ASTM E595-07 真空环境中放气引起的总质量损失及收集的挥发性可凝结物的测定用标准试验方法
• 2006年 ASTM E595-06 在真空环境中除气作用引起的总质量损失和收集到的挥发性可凝聚材料的标准试验方法
• 2003年 ASTM E595-93(2003)e2 在真空环境中排放的总质量损失和收集的挥发性可冷凝材料的标准测试方法
• 2003年 ASTM E595-93(2003)e1 在真空环境中排放的总质量损失和收集的挥发性可冷凝材料的标准测试方法
• 1993年 ASTM E595-93(1999) 真空环境中放气引起的总质量损失及收集的挥发性可凝结物的测定用标准试验方法

5.1 This test method evaluates, under carefully controlled conditions, the changes in the mass of a test specimen on exposure under vacuum to a temperature of 125°C and the mass of those products that leave the specimen and condense on a collector at a temperature of 25°C.

5.2 The 24 h test time does not represent actual outgassing from years of operation, so a higher test temperature shorter time was selected to allow material comparisons with no intent to predict actual outgassing in service. The test temperature of 125°C was assumed to be significantly above the expected operating temperature in service. If expected operating temperatures exceed 65 to 70°C the test temperature should be increased. It is suggested that test temperature be at least 30°C higher than expected maximum service temperature in order to provide material comparisons for TML and CVCM.

5.3 Comparisons of material outgassing properties are valid at 125°C sample temperature and 25°C collector temperature only. Samples tested at other temperatures may be compared only with other materials which were tested at that same temperature.

5.4 The measurements of the collected volatile condensable material are also comparable and valid only for similar collector geometry and surfaces at 25°C. Samples have been tested at sample temperatures from 50 to 400°C and at collector temperatures from 1 to 30°C by this test technique. Data taken at nonstandard conditions must be clearly identified and should not be compared with samples tested at 125°C sample temperature and 25°C collector temperature.

5.5 The simulation of the vacuum of space in this test method does not require that the pressure be as low as that encountered in interplanetary flight (for example, 10−12 Pa (10−14 torr)). It is sufficient that the pressure be low enough that the mean free path of gas molecules be long in comparison to chamber dimensions.

5.6 This method of screening materials is considered a conservative one because maximum operating temperatures in service are assumed not to exceed 50 to 60°C for most applications. It is possible that a few materials will have acceptable properties at the intended use temperature but will be eliminated because their properties are not satisfactory at the test temperature of 125°C. Also, materials that condense only below 25°C are not detected. The user may designate additional tests to qualify materials for a specific application.

5.7 The determinations of TML and WVR are affected by the capacity of the material to gain or lose water vapor. Therefore, the weighings must be accomplished under controlled conditions of 23°C and 508201;% relative humidity.

5.8 Alternatively, all specimens may be put into open glass vials during the 24-h temperature and humidity conditioning. The vials must be capped before removal from the conditioning chamber. Each specimen must be weighed within 2 min after opening the vial to minimize the loss or absorption of water vapor while exposed to an uncontrolled humid......

标准号

ASTM E595-15

发布

2015年

发布单位

美国材料与试验协会

替代标准

ASTM E595-15(2021)

当前最新

ASTM E595-15(2021)

 

 

引用标准

ASTM E177

ASTM E595-15相似标准

推荐

谁引用了ASTM E595-15 更多引用