ASTM D7191-24 PDF
Name in English:
St ASTM D7191-24
Name in Russian:
Ст ASTM D7191-24
Original standard ASTM D7191-24 in PDF full version. Additional info + preview on request
Full title and description
Standard Test Method for Determination of Moisture in Plastics by Relative Humidity Sensor — a short procedural standard that describes the use of a relative-humidity sensor system for the quantitative determination of water in plastic materials (down to low-ppm levels) for process control, acceptance, and material assessment.
Abstract
This test method specifies a sealed, airtight flow system that uses a relative humidity sensor to integrate the sensor signal over time and determine the total mass of water in a plastic specimen; the moisture mass is then reported relative to specimen mass as moisture content. The method is intended for control, acceptance, and assessment of plastic materials and is suitable for measurements down to about 20 ppm.
General information
- Status: Active.
- Publication date: 2024 (designated D7191-24; published/issued in 2024 — commonly listed as May 1, 2024; ASTM record last updated June 4, 2024).
- Publisher: ASTM International.
- ICS / categories: 83.080.01 (Plastics in general).
- Edition / version: D7191-24 (current 2024 edition; replaces earlier D7191-18/D7191-10 editions).
- Number of pages: 4.
Scope
This standard covers the quantitative determination of water in plastics using a relative humidity sensor and sealed flow system, with a stated lower detection/measurement capability down to approximately 20 ppm. It notes that specimens tested can reach or exceed 250 °C and advises appropriate handling and safety precautions. The standard does not claim an ISO equivalent.
Key topics and requirements
- Use of a relative-humidity sensor in an integrated, sealed flow system to measure water evolved from a specimen.
- Quantitation of moisture down to about 20 ppm in plastics.
- Integration of sensor signal over time to produce total water mass, with results reported as moisture content (mass of water per mass of specimen).
- Specimen heating and handling considerations (samples may reach/exceed 250 °C).
- Intended uses: process control, acceptance testing, and material assessment; guidance on safety and user responsibility for safe practices.
- Document metadata: DOI 10.1520/D7191-24 and Book of Standards volume 08.03 (Plastics).
Typical use and users
Applied by polymer R&D and QC laboratories, material suppliers, plastic processors, and third‑party testing laboratories for incoming material inspection, process monitoring (drying and molding operations), failure analysis where moisture may affect properties, and research where accurate low‑level moisture determination is required. The method is used where non‑destructive or small-sample moisture quantitation by a relative‑humidity sensor approach is appropriate.
Related standards
Previous and related ASTM documents include D7191-18, D7191-10, and D7191-05 (historical editions). The standard notes there is no known ISO equivalent. Users commonly refer to other ASTM D20 committee standards for plastics testing and to standards on sample preparation and safety where relevant.
Keywords
moisture determination, plastics, relative humidity sensor, moisture content, low-ppm moisture, analytical methods, D7191-24.
FAQ
Q: What is this standard?
A: ASTM D7191-24 is a Standard Test Method that defines a procedure using a relative humidity sensor and sealed flow system to quantify moisture in plastic materials.
Q: What does it cover?
A: It covers the quantitative determination of water in plastics (measurement capability down to ~20 ppm), requirements for the sealed sensor flow system, specimen handling (samples may reach/exceed 250 °C), and intended uses such as control and acceptance testing.
Q: Who typically uses it?
A: Polymer and materials testing laboratories, quality/production engineers at resin and part manufacturers, processors concerned with drying/moldability, and R&D analysts assessing moisture-related property effects.
Q: Is it current or superseded?
A: The D7191-24 edition (2024) is the current active edition (replaces earlier D7191 editions such as the 2018 version). ASTM’s record shows D7191-24 as active in 2024.
Q: Is it part of a series?
A: It is part of the D7191 family of test methods (previous editions: D7191-18, D7191-10, D7191-05) and falls under ASTM Committee D20 (Plastics), Book of Standards volume 08.03.
Q: What are the key keywords?
A: Moisture, water content, plastics, relative humidity sensor, low-ppm measurement, D7191, analytical methods.