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D6119-19 – Standard Test Method Technical Guide
🎯 Scope and Application of D6119‑19
ASTM D6119‑19 (Reapproved 2024) establishes a standardized laboratory practice for trafficking pile yarn floor coverings to induce surface appearance changes. The practice specifically targets mechanical wear — matting, flattening, and changes in pile fiber configuration — while deliberately eliminating the variable of soiling. It is applicable to all types of residential and commercial carpet constructions. By mutual agreement between the purchaser and supplier, the practice may also be used to set purchasing specifications for finished pile yarn floor coverings.
⚠️ Important Limitations: This practice does not simulate appearance changes due to soiling, pivoting motions, rolling traffic, or traffic on stairs. In addition, while “pile reversal” or “watermarking” may occasionally be observed, the method is not a reliable means for producing this specific phenomenon.
🏛️ Apparatus and Controlled Environment
Reproducible results depend heavily on strict control of the laboratory trafficking environment. The apparatus is defined as a dedicated area meeting the following requirements:
- Floor Substrate: Must be level, rigid, and free of any high or low areas. Acceptable floor types include tile, concrete, or wood.
- Traffic Control: The area must be kept free of all pedestrian traffic except for the designated walkers, whose passes constitute the measured foot traffic units.
| 🟦 Scope Parameter | 📐 Specification / Exclusion |
|---|---|
| Change Simulated | Matting, Flattening, Pile Fiber Configuration |
| Explicitly Excluded Factors | Soiling, Pivoting, Rolling Traffic, Stairs |
| Assessment Protocol | ASTM D7330 using CRI Reference Scales |
| Standard Unit System | Inch-Pound units (SI conversions provided for information only) |
💡 Technical Note: By isolating the mechanical effects of foot traffic from soiling and abrasive rolling actions, this practice allows direct insight into the structural durability of the pile yarn and tufted construction. It is an ideal tool for comparative product development and quality control testing.
⚙️ Referenced Standards and Procedural Summary
The practice relies on a framework of related ASTM standards. Test specimens are exposed to a specified number of foot traffics under controlled conditions. Assessment of the resulting change in surface appearance is performed according to Test Method D7330 using the Carpet and Rug Institute (CRI) Reference Scales. Necessary terminology — covering terms such as carpet, crush, loss of tuft definition, matting, and pile reversal — is defined in Terminology D5684 (Pile Floor Coverings) and D123 (Textiles). Users are directed to review the specific precautionary statements provided in Section 7 of the standard prior to testing.
| 📏 Procedural Element | 🎯 Standard Requirement |
|---|---|
| Exposure | Specified number of foot traffic units applied |
| Primary Observed Change | Mechanical wear (matting / flattening / fiber reconfiguration) |
| Unreliable Phenomena | Pile reversal / Watermarking |
❓ Frequently Asked Questions
🔍 What specific changes in surface appearance does D6119 target?
The standard targets changes resulting from matting, flattening, or alterations in pile fiber configuration. It is intentionally designed to exclude soiling effects so that pure mechanical wear can be evaluated.
💡 What types of traffic are excluded from this practice?
Per Section 5.1.1, this practice does not simulate surface appearance changes due to soiling, pivoting, rolling traffic (e.g., casters or carts), or traffic on stairs.
⚡ How is surface appearance change formally assessed after trafficking?
Assessment is conducted strictly in accordance with Test Method D7330, which employs the Carpet and Rug Institute (CRI) Reference Scales to rate the degree of change.
📌 Can this practice be used for commercial purchasing specifications?
Yes. Section 1.3 states the standard “may be used by mutual agreement between the purchaser and supplier to set purchasing specifications.”