ASTM D6855
Standard Test Method for Determination of Turbidity Below 5 NTU in Static Mode
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About This Item
ASTM D6855 is the ASTM standard for determining turbidity below 5 NTU in static mode. It provides a focused test method for low-turbidity measurement where fine differences in clarity matter, helping users evaluate liquids with greater consistency. For applications that depend on reliable optical assessment, this standard supports more repeatable testing and clearer comparison of results. ASTM D6855 is especially relevant when small changes in turbidity can affect product quality, process control, or acceptance decisions.
Purpose of ASTM D6855
The purpose of ASTM D6855 is to define a test method for measuring turbidity at very low levels, specifically below 5 NTU, using a static mode approach. This makes it useful when a sample must be assessed without movement-related variation affecting the reading. As a technical standard, it helps establish a consistent framework for low-range turbidity determination, supporting more dependable results across different laboratories, instruments, and testing programs.
Common use cases of ASTM D6855
ASTM D6855 is commonly used in laboratory and quality control settings where low turbidity must be measured with care. It may be applied to clear liquids, process waters, or other samples where slight haze or suspended matter needs to be detected and compared. The method is especially relevant for product evaluation, incoming inspection, and routine testing workflows that require a controlled, repeatable approach to turbidity measurement.
Why ASTM D6855 matters
This standard matters because low-turbidity measurements can be sensitive to small changes in handling, instrumentation, and test conditions. ASTM D6855 helps reduce uncertainty by providing a defined method for static-mode testing below 5 NTU. That supports consistency in compliance checks, procurement decisions, and quality assurance programs. When clarity is important, using a recognized ASTM method can improve confidence in test results and help limit avoidable disputes or rework.
- Low-range turbidity measurement
- Static mode testing approach
- Repeatable clarity assessment
- Quality control support
- Comparability of test results
- Publication Date: 2023-12-05
- Publisher: ASTM
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