Astm D338518 Pdf May 2026

ASTM D3385-18 establishes a standard field method for measuring soil infiltration rates using double-ring infiltrometers to assess hydraulic conductivity. This procedure involves maintaining a constant water head in concentric rings, measuring vertical water flow to determine the infiltration rate [1]. You can access the full standard through the ASTM website.

Why the "18" Matters: Changes from Previous Versions

The "18" in D3385-18 denotes the year of approval: 2018. This is the most current active version of the standard as of this writing (prior versions: D3385-09, D3385-03, D3385-94, etc.). Understanding what changed is important if your quality management system requires adherence to the latest revision. astm d338518 pdf

Key Data Obtained from the Test:

• Infiltration rate (cm/hr or in/hr) – the volume of water entering the soil per unit area per unit time.
• Cumulative infiltration (cm or in) – total depth of water infiltrated over time.
• Time to steady-state – when the infiltration rate becomes constant (usually after soil reaches saturation).

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• A downloadable PDF (official or permitted distribution) or the exact citation to request it from a standards provider
• A concise summary of the test method: specimen geometry, punch/die sizes, test speed, data reported, and common pitfalls
• Any allowed-equivalent methods or common lab adaptations for thin adhesive films
• Typical acceptance criteria or pass/fail thresholds used in industry (automotive/electronics)
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If you have a copy you can legally share or can point me to where to purchase/access it, please reply or DM. Thanks! Infiltration rate (cm/hr or in/hr) – the volume

Step-by-Step Summary of the Test Method (As Per ASTM D3385-18)

For engineers and technicians who eventually obtain the PDF, here is a condensed procedural overview:

How to Legally Obtain the ASTM D3385-18 PDF

A search for "astm d338518 pdf" often leads to third-party websites, file-sharing platforms, or "free PDF" links. Important legal warning: ASTM standards are copyrighted documents. Unauthorized distribution or downloading from illegal sites is a violation of intellectual property law and may result in penalties. Moreover, these copies are often outdated, corrupted, or contain OCR errors that compromise data.

3.1 The Rings

The standard mandates two concentric rings, typically constructed of steel or hard plastic.

• Inner Ring: This is the measurement ring. The standard suggests an inner diameter typically ranging from 200 mm to 300 mm (approx. 8 to 12 inches), though larger diameters are preferred for heterogeneous soils to ensure a representative elementary volume (REV).
• Outer Ring: This acts as the buffer zone. It must have a diameter sufficient to contain the lateral spread; a ratio where the outer ring diameter is approximately double the inner ring diameter is common.
• Depth of Penetration: The rings must be driven into the soil to a sufficient depth (typically 50 to 100 mm) to prevent leakage and bypass flow along the ring walls.