ASTM D1644-01 (2023) PDF

Full title and description

ASTM D1644-01(2023) — Standard Test Methods for Nonvolatile Content of Varnishes. These methods determine the fraction of a varnish that remains nonvolatile at the test temperature after volatile solvents are driven off; the result is often used as an approximate measure of the film‑forming (nonvolatile) matter in a varnish.

Abstract

Provides simple gravimetric oven‑drying test procedures to quantify nonvolatile content of varnish samples. The standard specifies test temperature considerations, sample preparation, drying and cooling procedures, and calculation of nonvolatile content by mass before and after removal of volatiles. It is intended for use by producers, purchasers, and testing laboratories for quality control and specification verification.

General information

• Status: Active — Reapproved 2023 (D1644‑01 reapproved).
• Publication date: Reapproval recorded in 2023 (listed as 07 January 2023 in public catalogs); ASTM record shows updated status in 2023.
• Publisher: ASTM International (Committee D01, Subcommittee D01.21).
• ICS / categories: Paints and varnishes — ICS 87.040 (paints, varnishes and related coatings).
• Edition / version: Designation D1644‑01, reapproved 2023 (often cited as D1644‑01(2023)).
• Number of pages: 2 pages (short test method).

Scope

This standard covers one or more gravimetric test procedures to determine the fraction (by mass) of a varnish that is nonvolatile at the selected test temperature by driving off volatile solvents in an oven and measuring mass change. It applies to varnish formulations where nonvolatile (film‑forming) content is relevant to product specification, formulation control, or comparative testing. The procedures note oven type/size and air change considerations as they can affect results.

Key topics and requirements

• Sample preparation and representative sampling of varnish products.
• Controlled oven drying (specified temperature and time) to remove volatiles without degrading nonvolatile film formers.
• Gravimetric measurement before and after drying and calculation of nonvolatile fraction (reported as percent nonvolatile by mass).
• Guidance on units (SI preferred) and statement on safety/health/environmental considerations for solvent handling and ventilation.
• Notes on interferences and factors that affect repeatability (oven air changes, decomposition of binders if overheated, residue handling).

Typical use and users

Used by varnish and coating manufacturers, quality control laboratories, raw material and formulation chemists, independent testing labs, and procurement/specification engineers who need a quick, comparable measure of nonvolatile (film‑forming) content for specification compliance, batch control, and comparative evaluation. Regulatory or defense agencies may reference the method where applicable.

Related standards

Referenced and related standards include other ASTM methods for paints, varnishes, and coatings (for example methods for related volatile/nonvolatile determinations and solids content such as D2369, D2697 and guides collected in ASTM D2832). Users often consult the ASTM Book of Standards Vol. 06.01 and related D01 committee documents for cross‑references.

Keywords

nonvolatile content, varnish, nonvolatile matter, solids content, gravimetric, oven drying, film‑forming matter, ASTM D1644.

FAQ

Q: What is this standard?

A: ASTM D1644‑01(2023) is a short ASTM test method that specifies gravimetric procedures to determine the nonvolatile (solids) fraction of varnishes by oven drying and weighing.

Q: What does it cover?

A: It covers sampling, oven drying under controlled conditions, measurement of mass loss due to volatiles, and calculation/reporting of percent nonvolatile content. It also provides notes on oven characteristics and safety considerations.

Q: Who typically uses it?

A: Varnish and coating manufacturers, QC and R&D labs, independent testing laboratories, and specification engineers use it for product control and verification.

Q: Is it current or superseded?

A: The designation D1644‑01 has been reapproved in 2023 and is listed as active/reapproved; it is not shown as superseded. Check ASTM or authorized distributors for the most current reapproval or amendment history before formal use.

Q: Is it part of a series?

A: It is part of ASTM Committee D01 (Paints, Coatings and Related Materials) publications and appears in Book of Standards volume 06.01; related methods for paints and coatings are published under the D01 series.

Q: What are the key keywords?

A: Nonvolatile content, varnish, solids content, gravimetric, oven drying, film former, ASTM D1644.