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D6360-15 – Standard Test Method Technical Guide
📐 Scope and Specimen Guidelines for D6360
This practice covers the specific procedures and test conditions for exposing plastic materials in enclosed carbon-arc devices, conducted strictly in accordance with Practices G151 and G153. It encompasses the preparation of test specimens and defines the conditions suited for evaluating the deterioration of plastics due to light, heat, and moisture. It is important to distinguish this practice from D1499, which covers filtered open-flame carbon-arc exposures for plastics, and D5031, which targets paints and coatings. All values in this standard are regarded as SI units.
⚠️ Variability in Results: As stated in Section 4.2 of the standard, significant variation in results can be expected when operating conditions are varied within the accepted limits of this practice. Consequently, no reference to the use of this practice is permitted unless it is accompanied by a detailed report (per Section 9) describing the specific operating conditions used.
⚙️ Test Cycles, Operating Conditions, and Apparatus
The enclosed carbon-arc apparatus is operated per Practice G153 using a standard cycle that alternates between light-only and light-with-water-spray periods. The table below details the standard exposure parameters commonly employed under this practice:
| 🟦 Parameter | 📏 Specified Condition | 🎯 Tolerance / Reference |
|---|---|---|
| Light / Water Spray Cycle | 102 min Light Only, 18 min Light + Spray | Per Practice G153 |
| Black Panel Temperature (Uninsulated) | 63 °C | ± 3 °C |
| Relative Humidity (Light Cycle) | 30 % | ± 5 % |
| Chamber Air Temperature | Controlled (typically 35–45 °C) | Per Instrument Calibration |
🚫 Scope Limitations: The exposure defined in this practice is intended to simulate deterioration caused by sunlight, moisture, and heat. It is not designed to replicate localized weather phenomena such as atmospheric pollution, biological attack, or saltwater exposure (Section 4.1).
📊 Key Measured Properties and Property Retention
The standard specifically targets the ability of a material to resist deterioration of its electrical, mechanical, and optical properties. Evaluations involve comparing exposed specimens to unexposed controls to calculate a Property Retention Index, following the guidance of Practice D5870. The table below outlines typical property evaluations associated with this practice:
| 📐 Property Category | ⚡ End-Use Application | 📌 Typical Retention Metrics |
|---|---|---|
| Optical | Color stability, Gloss retention | ΔE* (CIELAB), Yellowness Index (YI), % Gloss Retention |
| Mechanical | Structural integrity, Impact resistance | % Retention of Tensile Strength (D638), Elongation, Impact Energy (D256) |
| Electrical | Insulating properties | % Retention of Dielectric Strength (D149), Surface/Volume Resistivity |
💡 Reporting Best Practice: To ensure reproducibility, always reference the specific cycle settings, black panel temperature, and filter type used. Refer to Practices G141, G147, and G169 for strategies to address variability and apply basic statistical methods to weathering data.
❓ Frequently Asked Questions
🔍 What is the main difference between D6360 and D1499?
D6360 specifies the use of an enclosed carbon-arc apparatus for plastics, while D1499 covers filtered open-flame carbon-arc exposures for plastics. The spectral power distribution and test conditions differ significantly between the two apparatus types.
💡 What specific material properties should be evaluated?
The standard explicitly highlights the evaluation of electrical, mechanical, and optical property changes. The specific test methods (e.g., D638 for tensile, D2244 for color) should be selected based on the material’s intended end-use application and the property changes of interest.
⚡ What is the standard exposure cycle for plastics in this practice?
While Practice G153 defines the apparatus operation, a common and accepted cycle for plastics is 102 minutes of continuous light, followed by 18 minutes of light combined with a deionized water spray, maintaining an uninsulated black panel temperature of 63 °C ± 3 °C.
📌 Is there an international (ISO) equivalent to this practice?
No. Note 1 of the standard explicitly states, “There is no known ISO equivalent to this practice,” making it a unique North American standard for enclosed carbon-arc testing of plastics.