ASTM RR-D31-1020 2014 PDF

Full title and description

St ASTM RR-D31-1020 2014 — Research Report RR:D31-1020 related to ASTM D6656: "Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)". The report documents an interlaboratory study carried out to establish a precision statement for ASTM D6656.

Abstract

This research report (RR:D31-1020), approved April 1, 2014, summarises an interlaboratory study performed by nine laboratories on 16 Wet Blue samples to obtain precision and reproducibility data for the D6656 chromic-oxide test procedure (perchloric acid oxidation). The results provide the precision statement used to support and validate the D6656 standard test method.

General information

• Status: Research report associated with an active ASTM test method (used to support D6656).
• Publication date: Research report approved April 1, 2014.
• Publisher: ASTM International — Committee D31, Subcommittee D31.02 (Wet Blue).
• ICS / categories: Leather and leather products; chemical analysis; laboratory test methods (ASTM D31 / subcommittee D31.02). ICS codes associated with D6656 include 59.140.10 and 71.040.40 for related documents.
• Edition / version: RR:D31-1020 (2014), associated with ASTM D6656 (2014-series; later revisions exist).
• Number of pages: Not specified for the RR in public listing; typical ASTM research reports of this type are short (single‑digit to low‑two‑digit pages). The D6656 standard itself is a short test method (4–5 pages depending on edition).

Scope

The report's scope is to document the design, execution, and statistical analysis of an interlaboratory study for determining chromic oxide in Wet Blue (leather tanned with chromium), using the perchloric acid oxidation procedure specified in ASTM D6656. Its purpose is to provide precision (repeatability and reproducibility) statements and to support the D6656 standard's use in quality control and specification.

Key topics and requirements

• Interlaboratory study design: participating labs, sample set (16 samples), and test matrix.
• Analytical method tested: ASTM D6656 perchloric acid oxidation procedure for chromic oxide determination in Wet Blue.
• Statistical treatment: calculation of repeatability and reproducibility (precision statement) for the method.
• Sample preparation and handling recommendations specific to Wet Blue leather.
• Limitations, interferences and applicable concentration range (typical Wet Blue chromium content ~1–5% expressed as chromic oxide).

Typical use and users

Used by leather manufacturers, tannery quality-control laboratories, independent test laboratories, procurement/specification engineers, and standards developers. The report is a reference for laboratories applying ASTM D6656 to verify the expected precision of measurements and to support contractual or regulatory specifications for Wet Blue chromium content.

Related standards

Directly related to ASTM D6656 (Standard Test Method for Determination of Chromic Oxide in Wet Blue). Other related committee documents and possible national/international leather‑testing methods may be used in parallel; consult Committee D31 publications for companion methods and practices.

Keywords

RR-D31-1020, research report, ASTM, D6656, chromic oxide, chromium, Wet Blue, tannery, perchloric acid oxidation, interlaboratory study, precision, repeatability, reproducibility, D31.02.

FAQ

Q: What is this standard?

A: This item is a Research Report (RR:D31-1020) published by ASTM to document an interlaboratory study supporting ASTM D6656, the test method for determination of chromic oxide in Wet Blue leather. The report provides the precision statement and supporting data for the method.

Q: What does it cover?

A: It covers the interlaboratory testing program (nine laboratories, 16 samples), methodological details of how the D6656 procedure was applied across laboratories, and the statistical analysis used to derive method precision (repeatability and reproducibility).

Q: Who typically uses it?

A: Leather/tannery quality-control personnel, testing laboratories, standards committees, and anyone specifying or verifying chromium content in Wet Blue. It is primarily of interest where traceable method precision data are required.

Q: Is it current or superseded?

A: The research report was approved April 1, 2014 to support the D6656 method; ASTM D6656 has had later revisions (see D6656-16, D6656-24 and other editions). The RR documents the 2014 interlaboratory data; users should check the current D6656 edition for the latest normative text and whether the RR precision statement is incorporated or superseded.

Q: Is it part of a series?

A: It is part of ASTM’s Research Report series tied to Committee D31 (Leather) and specifically to Subcommittee D31.02 (Wet Blue), and is identified by stock number RR-D31-1020. Similar RRs document interlaboratory studies for other D31 test methods.

Q: What are the key keywords?

A: Chromic oxide, chromium, Wet Blue, perchloric acid oxidation, D6656, interlaboratory study, precision statement, ASTM Committee D31, RR-D31-1020.