ASTM C429-21 (2025) PDF

Full title and description

Standard Test Method for Sieve Analysis of Raw Materials for Glass Manufacture — a standardized procedure for sampling and dry sieve analysis to determine the particle‑size distribution of common glass raw materials (sand, soda‑ash, limestone, alkali‑alumina silicates and similar granular batch materials).

Abstract

This standard specifies procedures for obtaining representative gross and laboratory samples, preparing test specimens, using conforming test sieves (reference to Spec E11), conducting dry sieve analysis, and reporting the particle size distribution and percent retained on each sieve. Typical laboratory sample sizes, test specimen mass, and key definitions used in the method are included.

General information

• Status: Active / Current (reconfirmed/reissued in 2025; edition designation C429‑21).
• Publication date: 2025 (document shown with a 2025 confirmation/reissue date — commonly listed as August 1, 2025 in publishers' catalogs).
• Publisher: ASTM International.
• ICS / categories: 19.120 (Particle size analysis; sieving) and 81.040.10 (Raw materials and raw glass).
• Edition / version: C429‑21 (technical content approved in 2021; shown as C429‑21 with a 2025 confirmation/reissue).
• Number of pages: 8 pages.

Scope

This test method covers dry sieve analysis for common granular raw materials used in glass manufacture (for example: glass‑making sands, soda‑ash, limestone, and alkali‑alumina silicates). It defines sampling increments, gross and laboratory sample sizes, required sieves (reference to ASTM E11), test specimen preparation, sieving procedure, calculation of percent retained/passing, and reporting conventions. It does not address safety practices; users must establish appropriate safety and regulatory measures.

Key topics and requirements

• Sampling protocol: definitions of gross sample, sample increment, laboratory sample and test specimen to ensure representative results.
• Laboratory sample and test specimen sizes: typical laboratory sample (≈0.9–1.8 kg) and test specimen (≈100–150 g) recommendations.
• Use of standard testing sieves conforming to ASTM E11 (mesh sizes, construction, tolerance).
• Sieving procedure: dry sieving method, suggested sieve stack arrangement, mechanical shaker use, and timing/technique to achieve reproducible separation.
• Calculations and reporting: percent retained and percent passing on each sieve, rounding conventions, and how to report particle‑size distribution for quality control and specification compliance.
• Precision and interlaboratory considerations: references to precision/reproducibility studies and related research reports for method variability.

Typical use and users

Used by glass manufacturers, raw‑material suppliers, quality‑control and analytical laboratories, research institutions, and procurement/specification teams to verify particle‑size distributions of batch materials that affect melting behavior, batch homogeneity, and final glass properties.

Related standards

Key related documents include ASTM E11 (Specification for Wire Cloth and Sieves for Testing Purposes) which defines sieve construction and tolerances referenced in this method; related sieve and particle‑size standards (other ASTM and ISO particle‑size and sieving methods) are typically used in combination for complementary tests.

Keywords

glass raw materials, sieve analysis, particle‑size distribution, sampling, laboratory sample, test specimen, ASTM E11, sieve shaker, sieving, quality control.

FAQ

Q: What is this standard?

A: ASTM C429‑21 (reconfirmed/reissued 2025) is the Standard Test Method for Sieve Analysis of Raw Materials for Glass Manufacture, providing a harmonized procedure for sampling and dry sieve particle‑size determination of glass batch materials.

Q: What does it cover?

A: It covers sampling definitions and procedures, laboratory and test specimen sizes, required sieves (per E11), sieving technique, calculations of percent retained/passing, and reporting conventions for granular raw materials used in glass manufacture. It focuses on dry sieve analysis and particle‑size distribution.

Q: Who typically uses it?

A: Glass producers, raw‑material suppliers, QC/analytical labs, researchers, and standards/specification writers use this method to qualify and control the particle‑size characteristics of batch materials.

Q: Is it current or superseded?

A: The technical content is designated C429‑21 (approved in 2021); publishing and catalog listings show a 2025 confirmation/reissue (document presented as C429‑21(2025)). It is presented as the active/current test method in catalog listings. Users should check ASTM's official catalog for the latest status before use.

Q: Is it part of a series?

A: It is maintained by ASTM Committee C14 (Glass and Glass Products) and relates to other C14 subcommittee test methods and referenced standards (for example ASTM E11 for sieves). It sits within the family of particle‑size and materials‑testing standards used by the glass industry.

Q: What are the key keywords?

A: glass raw materials; sieve analysis; particle‑size distribution; sampling; sieve shaker; ASTM E11; laboratory sample; test specimen; quality control.