ISO 7087-1984 PDF

Full title and description

ISO 7087:1984 — Ferroalloys — Experimental methods for the evaluation of the quality variation and methods for checking the precision of sampling. This international standard specifies experimental procedures for estimating quality variation parameters and for assessing the precision of sampling and sampling-related measurements for ferroalloys; it includes guidance, example data forms and an annex with supplementary information.

Abstract

Defines experimental designs and measurement procedures to evaluate within‑lot and between‑lot quality variation of ferroalloys, and presents methods to check the precision (repeatability/reproducibility) of sampling, sample preparation and chemical determinations used for these materials. Intended to support reliable estimation of random sampling parameters used in related delivery and specification standards.

General information

• Status: Published (International Standard; confirmed following periodic review).
• Publication date: October 1984 (Edition 1, 1984).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.100 — Ferroalloys; sampling and testing of metallurgical products.
• Edition / version: 1 (1984).
• Number of pages: 13 pages.

Key bibliographic and status details above are based on the ISO catalogue entry for ISO 7087:1984.

Scope

Applies to experimental methods for determining parameters of random sampling and for checking sampling precision for ferroalloys described in the relevant ISO delivery and sampling standards. The standard covers both bulk (random sampling) and packaged (two‑stage sampling) consignments, describes sample collection and preparation approaches for crushable and non‑crushable ferroalloys, and specifies the number and arrangement of experimental replicates and the statistical treatment of experimental data.

Key topics and requirements

• Definitions of quality characteristics and quality variation relevant to ferroalloys.
• Experimental designs for Type I (random sampling, bulk consignments) and Type II (two‑stage sampling, packaged consignments) trials.
• Sampling procedures for crushable and non‑crushable ferroalloys (increment selection, drilling/chipping, preparation of split/sub‑samples).
• Minimum numbers of replicates and rules for selection of consignments and units for experiment.
• Analytical order and requirements for single determinations on each test sample.
• Statistical methods for analysis of experimental data to estimate variation components and to check sampling precision.
• Recommended data recording forms and example tables/figures to document experiments and results.

Typical use and users

Used by quality engineers, metallurgical laboratories, sampling specialists, producers and purchasers of ferroalloys, and standards/inspection bodies who need to assess or verify sampling performance and to estimate the contribution of sampling to overall measurement uncertainty. Typical applications include supplier quality control, contractual dispute resolution about lot quality, and validation of sampling procedures used for chemical analysis.

Related standards

Standards to read in conjunction with ISO 7087 include other ISO documents on ferroalloy sampling and experimental checks, for example ISO 3713 (sampling and preparation — general rules), ISO 7347 (experimental methods for checking sampling bias) and ISO 7373 (experimental methods for checking precision of sample division). These companion standards provide complementary procedures for sampling, bias checks and sample‑preparation precision.

Keywords

ferroalloys, sampling, sample preparation, sampling precision, quality variation, experimental methods, statistical analysis, ISO/TC 132.

FAQ

Q: What is this standard?

A: ISO 7087:1984 is an International Standard that specifies experimental methods for evaluating the quality variation of ferroalloys and methods for checking the precision of sampling and related laboratory procedures.

Q: What does it cover?

A: It covers experimental designs (bulk and packaged consignments), sampling techniques for crushable and non‑crushable ferroalloys, preparation of split test samples, the required number of replicates, statistical treatment of results and example data recording forms. It is focused on determining sampling‑related variation and checking the precision of sampling and sample‑division procedures.

Q: Who typically uses it?

A: Metallurgical laboratories, sampling and quality assurance engineers, producers and purchasers of ferroalloys, inspection and testing bodies, and standards committees involved in sampling and quality control of metallurgical materials.

Q: Is it current or superseded?

A: The 1984 edition (Edition 1) remains the published International Standard and, following periodic ISO review, was confirmed as current in the most recent ISO catalogue review cycle (reviewed and confirmed in 2022). Users should check the ISO catalogue or their national standards body for any later revisions or withdrawal notices before relying on it for new contractual specifications.

Q: Is it part of a series?

A: Yes — ISO 7087 is part of the family of ISO standards on ferroalloys and sampling practices (ISO/TC 132 work programme). It is intended to be used together with related standards such as ISO 3713, ISO 7347 and ISO 7373, which deal with sampling rules, bias checks and precision of sample division.

Q: What are the key keywords?

A: Key keywords are: ferroalloys, sampling, sampling precision, quality variation, experimental methods, sample preparation, statistical analysis, ISO 7087.