GB/T 7141-2008
ActivePlastics—Methods of heat aging
塑料热老化试验方法
Catalogue
前言 → 1 范围 → 2 规范性引用文件 → 3 术语和定义 → 4 意义和应用 Foreword → 1 Scope → 2 Normative References → 3 Terms and Definitions → 4 Significance and Use
Scope
1.1 This standard specifies the exposure conditions for plastics when exposed to hot air at different temperatures for extended periods. This standard only specifies the method of heat exposure, and does not specify test methods or specimens. The effect of heat on any property of plastics can be determined by selecting appropriate test methods and specimens. This standard recommends using ASTM D3826 to determine the embrittlement endpoint. The embrittlement endpoint means that at an initial strain rate of 0.1 mm/min, when 75% of the tested specimens have an elongation at break of 5% or less, the material has reached its embrittlement endpoint. 1.2 This standard provides guidelines for comparing the heat aging properties of materials, which are determined by changes in a relevant property (i.e., embrittlement properties are determined by the reduction in elongation). This standard is applicable for evaluating plastics that are susceptible to oxidation during use. 1.3 The results obtained according to this standard are affected by the type of heat aging oven used. The user may choose one of two methods for heat aging oven exposure. Results based on these two methods should not be interchanged. 1.3.1 Method A: Gravity convection heat aging oven - Recommended for thin specimens with nominal thickness not greater than 0.25 mm. 1.3.2 Method B: Forced ventilation heat aging oven - Recommended for specimens with nominal thickness greater than 0.25 mm. 1.4 This standard introduces a method for comparing the heat aging properties of materials at a single temperature. This standard also describes a method for determining the heat aging properties of materials over a range of temperatures, in order to estimate the time required for a specified property change to occur in the material at a lower temperature. This standard does not predict heat aging performance under the interaction of factors such as stress, environment, temperature, and timed failure. 1.5 This standard does not address safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations.
1.1 本标准规定了塑料仅在不同温度的热空气中暴露较长时间时的暴露条件。本标准仅规定了热暴露的方法,而未对试验方法或试样进行规定。热对塑料任何性能的影响都可以通过选择适合的试验方法和试样来测定 ,本标准推荐使用 ASTM D3826 标准来测定脆化终点 ,脆化终点是指在 0.1 mm/min 的初始应变速率下 ,当 75 %的被测试样断裂伸长率为5 %或更小值时 ,材料即达到其脆化终点。 1.2 本标准给出了比较材料热老化性能的导则 ,这些性能通过某相关性能的娈化来测定(也就是说 ,脆化性能通过伸长率的减少来测定) 。本标准适用于评价使用时易氧化的塑料 1.3 按照本标准得到的结果受到所用热老化试验箱类型的影响。使用者可以选择两种方法中的一种进行热老化试验箱暴露。基于这两种方法的结果不应相互混淆。 1.3.1 方法 A:重力对流式热老化试验箱- 推荐用于标称厚度不大于0.25 mm 的薄型试样。 1.3.2 方法 B:强制通风式热老化试验箱- 推荐用于标称厚度大于 0.25 mm 的试样。 1.4 本标雄介绍了在单一温度下比较材料热老化性能的方法。本标雄还描述了材料在一系列温度下测定热老化性能的方法 ,以此来估计在某更低温度下材料发生规定特性娈化所需的时间= 本标准没有预计应力 ,环境 ,温度和控时失效等因素相互作用时的热老化性能 1.5 本标准没有涉及相关安全性的说明 ,即使有也仅与其应用有关。本标堆的使用者在使用前有责任建立适用的安全和健康规范 ,并确定应用规章限制
Normative References
Keywords
Application Summary AI generated
Plastics manufacturers and R&D institutions use this standard to evaluate the aging rate and lifespan of plastic materials under elevated temperatures. By providing standardized heat exposure conditions, it allows for comparison of the thermal resistance of different plastic formulations, aiding in material selection and product design. The standard is important because it offers two oven methods with different ventilation types, suitable for specimens of varying thicknesses, enabling more accurate simulation of real-world service environments.
塑料生产企业和研发机构使用该标准来评估塑料材料在高温下的老化速度和寿命。通过标准化的热暴露条件，可以比较不同塑料配方的耐热性能，为材料选型和产品设计提供依据。该标准的重要性在于它提供了两种不同通风方式的试验箱方法，适用于不同厚度的试样，从而更准确地模拟实际使用环境。
AI Summary AI generated
This standard specifies test methods for the long-term exposure of plastics to hot air, applicable for evaluating the heat aging performance of oxidizable plastics. It provides two types of heat aging ovens: gravity convection (for thin specimens) and forced ventilation (for thicker specimens). By measuring changes in material properties (e.g., embrittlement endpoint), the standard allows comparison of heat aging characteristics at a single temperature or over a range of temperatures, aiding in assessing thermal stability or estimating service life. Safety concerns are not addressed; users must establish appropriate safety practices.
本标准规定了塑料在热空气中长期暴露的试验方法，适用于评价易氧化塑料的热老化性能。标准提供了两种热老化试验箱方法：重力对流式（用于薄型试样）和强制通风式（用于厚型试样）。通过测定材料性能变化（如脆化终点），可比较材料在单一温度或一系列温度下的热老化特性，用于评估材料的热稳定性或预估使用寿命。标准未涉及安全规范，使用者需自行建立安全措施。
Key Sentences extracted from text
本标准规定了塑料仅在不同温度的热空气中暴露较长时间时的暴露条件。
本标准推荐使用 ASTM D3826 标准来测定脆化终点 ,脆化终点是指在 0.1 mm/min 的初始应变速率下 ,当 75 %的被测试样断裂伸长率为5 %或更小值时 ,材料即达到其脆化终点。
方法 A:重力对流式热老化试验箱- 推荐用于标称厚度不大于0.25 mm 的薄型试样。
方法 B:强制通风式热老化试验箱- 推荐用于标称厚度大于 0.25 mm 的试样。
本标雄介绍了在单一温度下比较材料热老化性能的方法。
This standard specifies the exposure conditions for plastics when exposed to hot air at different temperatures for extended periods.
This standard recommends using ASTM D3826 to determine the embrittlement endpoint. The embrittlement endpoint means that at an initial strain rate of 0.1 mm/min, when 75% of the tested specimens have an elongation at break of 5% or less, the material has reached its embrittlement endpoint.
Method A: Gravity convection heat aging oven - Recommended for thin specimens with nominal thickness not greater than 0.25 mm.
Method B: Forced ventilation heat aging oven - Recommended for specimens with nominal thickness greater than 0.25 mm.
This standard introduces a method for comparing the heat aging properties of materials at a single temperature.
Standard Timeline
Changes from replaced version:
- GB/T 7141-1992中只有一种热老化试验箱方法即强制通风的空气热老化试验箱。而本标准提供了两种热老化试验箱方法 ,即重力对流式热老化试验箱和强制通风式热老化试验箱这两种热老化试验箱分别适用于不同标称厚度的试样
- 本标准对塑料热老化试验提出了更多试验周期选择的要求
- 本标准除了提供单一温度下每种材料在每个暴露周期的试验方法和结果比较方法外 ,还提供了一系列温度下每种材料进行暴露试验时的试验方法和结果比较方法
- GB/T 7141-1992 only had one heat aging oven method, the forced ventilation air heat aging oven. This standard provides two heat aging oven methods: gravity convection heat aging oven and forced ventilation heat aging oven, which are respectively applicable to specimens of different nominal thicknesses.
- This standard proposes requirements for more test cycle options for plastic heat aging tests.
- In addition to providing test methods and result comparison methods for each material at each exposure cycle at a single temperature, this standard also provides test methods and result comparison methods for exposing each material over a range of temperatures.