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D6105-04 – Standard Test Method Technical Guide
⚙️ Technologies Covered in the Standard
ASTM D6105-04 (Reapproved 2019) establishes a standardized practice for applying electrical discharge surface treatments—also known as activation—to polymeric substrates to enhance adhesive bonding. The standard focuses specifically on non-equilibrium, non-thermal discharge phenomena where the electron temperature (mean energy) greatly exceeds the gas temperature. Practitioners must select the appropriate treatment technology based on the substrate material and required bond performance. Table 1 provides the complete taxonomy of technologies covered in the standard.
| 🟦 Technology Category | 📐 Section Reference |
|---|---|
| Gas plasma at reduced pressure | 8 |
| Electrical discharges at atmospheric pressure | 9 |
| AC dielectric barrier discharge | 9.1 |
| High Frequency Apparatus | 9.1.1 |
| Suppressed Spark Apparatus | 9.1.2 |
| Arc Plasma Apparatus | 9.2 |
| Glow Discharge Apparatus | 9.3 |
⚠️ Terminology Alert: The standard explicitly cautions that the term “corona treatment” has sometimes been applied loosely in the literature to the various atmospheric pressure discharge technologies listed in Section 9. This practice defines each technology distinctly and draws necessary distinctions between them and corona discharge, which is defined separately in Test Method D1868 (see Note 1 of the standard).
📏 Terminology and Measurement Verification
Accurate terminology is critical for the successful application of these treatments. The standard defines key terms such as contact angle (the angle in degrees between the substrate surface and the tangent line drawn to the droplet surface from the three-phase point) and AC dielectric barrier discharge (a self-sustaining AC discharge in relatively short gaps with a solid dielectric layer). To verify treatment efficacy, the standard references several specific ASTM test methods for quantifying surface activation.
| 🎯 Measurement Objective | ⚡ Referenced Standard |
|---|---|
| Wetting tension of polyethylene and polypropylene films | D2578 |
| Water contact angle measurements on corona-treated polymer films | D5946 |
| Surface wettability via angle-of-contact method | D724 (Withdrawn 2009) |
| Detection and measurement of partial discharge (corona) pulses | D1868 |
🛡️ Scope, Units, and Safety Responsibilities
The scope of this practice is specifically limited to the electrical discharge treatments themselves (Section 1.1). It does not include additional information on the preparation of test specimens or testing conditions, which are covered by the various ASTM test methods or specifications for specific materials. All values stated in the standard are regarded as standard in SI units (Section 1.4).
💡 Key Safety Directive: The standard explicitly states it does not purport to address all safety concerns associated with its use. The user bears the full responsibility for establishing appropriate safety, health, and environmental practices. Specific hazard statements regarding the equipment and processes are located in Section 6 of the full standard document.
❓ Frequently Asked Questions
🔍 What is the primary goal of ASTM D6105-04?
The primary goal is to provide a standardized practice for the application of electrical discharge surface treatments (activation) to enhance the ability of polymeric substrates to be adhesively bonded. The standard categorizes the various treatment technologies but defers specific specimen preparation and testing conditions to other applicable ASTM standards.
⚡ How does this standard distinguish “corona treatment” from other methods?
The standard defines “corona” specifically as visible partial discharges in gases adjacent to a conductor (see Test Method D1868). It acknowledges that “corona treatment” has been applied loosely in literature but distinguishes it from other atmospheric pressure technologies such as AC dielectric barrier discharge, glow discharge, and arc plasma apparatus, which are specifically defined in Section 9 of the practice.
📌 What is the definition of “electrical discharge” according to this standard?
Section 3.2.5 defines “electrical discharge” as any of several types of electrical breakdown of gases, primarily air. This definition serves as the broad umbrella term covering the various non-equilibrium discharge phenomena used for surface modification of polymers, wherein the electron temperature significantly exceeds the gas temperature.
📐 What units and terminology framework are used in this practice?
The values stated in SI units are to be regarded as the standard (Section 1.4). Additionally, many general adhesive terms used in the practice are defined in Terminology D907, ensuring consistency with the broader ASTM D14 committee standards on adhesives.