ASTM G90-2017

ASTM G90 以聚集自然光源方法對非金屬材料進行加速室外老化測試

ASTM G90-2017發行信息

標準號ASTM G90-2017

中文名 用集中自然陽光光線法加速實施對非金屬材料的室外風蝕的標準實施規程

英文名 Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight

發布日期2017

實施日期

廢止日期無

中國標準分類號H25

發布單位US-ASTM

ASTM G90-2017適用范圍

1.1 Fresnel-reflecting concentrators using the sun as source are utilized in the accelerated outdoor exposure testing of materials.

1.2 This practice covers a procedure for performing accelerated outdoor exposure testing of materials using a Fresnel-reflector accelerated outdoor weathering test machine. The apparatus (see Fig. 1 and Fig. 2) and guidelines are described herein to minimize the variables encountered during outdoor accelerated exposure testing.

1.3 This practice does not specify the exposure conditions best suited for the materials to be tested but is limited to the method of obtaining, measuring, and controlling the procedures and certain conditions of the exposure. Sample preparation, test conditions, and evaluation of results are covered in existing methods or specifications for specific materials.

1.4 The Fresnel-reflector accelerated outdoor exposure test machines described may be suitable for the determination of the relative durability of materials exposed to sunlight, heat, and moisture, provided the mechanisms of chemical or physical change, or both, which control the acceleration factors for the materials do not differ significantly.

1.5 This practice establishes uniform sample mounting and in-test maintenance procedures. Also included in the practice are standard provisions for maintenance of the machine and Fresnel-reflector mirrors to ensure cleanliness and durability.

1.6 This practice shall apply to specimens whose size meets the dimensions of the target board as described in 8.2.

1.7 For test machines currently in use, this practice may not apply to specimens exceeding 13 mm (1/2 in.) in thickness because cooling may be questionable.

1.8 Values stated in SI units are to be regarded as the standard. The inch-pound units in parentheses are provided for information only.

1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

1.1使用太陽作為光源的菲涅耳反射聚光器用于材料的加速室外暴露試驗。

1.2本規程涵蓋了使用菲涅耳反射器加速室外風化試驗機對材料進行加速室外暴露試驗的程序。本文描述了裝置（見圖1和圖2）和指南，以最小化室外加速暴露試驗期間遇到的變量。

1.3本規程未規定最適合待測材料的暴露條件，但僅限于獲取、測量和控制暴露程序和特定條件的方法。特定材料的現有方法或規范涵蓋了樣品制備、試驗條件和結果評估。

1.4所述菲涅耳反射器加速戶外暴露試驗機可適用于測定暴露在陽光、熱量和水分下的材料的相對耐久性，前提是控制材料加速系數的化學或物理變化機制或兩者沒有顯著差異。

1.5本規程建立了統一的樣品安裝和試驗維護程序。本規程還包括維護機器和菲涅耳反射鏡的標準規定，以確保清潔度和耐用性。

1.6本規程應適用于尺寸符合8.2所述目標板尺寸的試樣。

1.7對于目前使用的試驗機，本規程可能不適用于厚度超過13 mm（1/2 in.）的試樣，因為冷卻可能有問題。

1.8以國際單位制表示的數值應視為標準。括號中的英寸-磅單位僅供參考。

1.9本標準并非旨在解決與其使用相關的所有安全問題（如有）。本標準的使用者有責任在使用前建立適當的安全、健康和環境實踐，并確定監管限制的適用性。

1.10本國際標準是根據世界貿易組織技術性貿易壁壘（TBT）委員會發布的《關于制定國際標準、指南和建議的原則的決定》中確立的國際公認標準化原則制定的。