GOST 4765-73 PDF

Full title and description

GOST 4765-73 — Paints and varnishes (lacquer materials). Method for determination of impact resistance (Методы определения прочности при ударе). The standard specifies a laboratory test procedure for evaluating the resistance of paint and varnish coatings to mechanical impact using a falling-weight/impact tester and defined coated test panels.

Abstract

This standard describes a controlled impact test to determine the maximum energy (or corresponding drop height for a given mass) that a coating can absorb without visible mechanical damage. Typical content includes specimen preparation (substrate types and sizes), test apparatus and mass/height combinations, test procedure, acceptance criteria (visual damage assessment), and reporting of results. The method is intended for quality control and comparative evaluation of coating toughness.

General information

• Status: Replaced / superseded (listed as ЗАМЕНЕН; later edition published — see successor standard GOST 4765-2024).
• Publication date: Original designation year 1973; in effect from July 1, 1974 according to official listings.
• Publisher: Adopted as an Interstate/State standard (Межгосударственный стандарт) under the USSR State Committee for Standards (Gosstandart) / later administered within the EASC framework.
• ICS / categories: 87.040 — Paints and varnishes (paints and coating industry test methods category).
• Edition / version: GOST 4765-73 (original 1973 issue); later reprints/editions and amendments were recorded (reissue noted in 1993 with subsequent amendments).
• Number of pages: Bibliographic listings vary (commonly shown as 6–7 pages in circulation copies).

Scope

GOST 4765-73 covers a laboratory impact-resistance test method for paint and varnish films applied to specified metal (steel or aluminum) panels or other approved substrates. The scope includes specimen preparation (substrate type and dimensions), conditioning of coated panels, the apparatus and calibrated masses used for impact, procedure for dropping the mass from specified heights (or equivalent energy), and criteria for assessing and recording visible damage to the film. The method is intended for product specification, quality control and comparative research of coating toughness.

Key topics and requirements

• Test principle: falling-weight (pendulum or drop-weight arrangement) impact applied to coated panel; determination of maximum drop height/energy producing no visible cracking, flaking, or loss of adhesion.
• Specimen preparation: specified substrate materials (cold-rolled steel, aluminum alloys), plate thickness and dimensions, coating application and drying/curing conditions.
• Apparatus and calibration: defined mass(es) and impact head geometry; requirements for calibration and repeatability of drop height/energy.
• Procedure and acceptance criteria: stepwise drops (or single-drop at defined energy), visual inspection for damage, and reporting format for results (height, energy, damage description).
• Reporting: clear statement of substrate, coating thickness, curing conditions, test mass/geometry, number of impacts, observed damage and measured limiting height/energy.

Typical use and users

Primary users are paint and varnish manufacturers, independent materials testing laboratories, quality control departments, coating R&D groups, and procurement/specification engineers who must verify mechanical robustness of coatings. The method is used for QC acceptance, comparative performance ranking, and product data-sheet validation.

Related standards

Predecessor: GOST 4765-59 (earlier version replaced by the 1973 edition). Successor / replacement: GOST 4765-2024 (modernized replacement listed in bibliographic databases). The test is conceptually related to international coating impact tests found in various national standards (comparable falling-weight/impact procedures used in ISO/ASTM family test methods for coatings).

Keywords

GOST 4765-73, paints and varnishes, lacquer materials, impact resistance, falling-weight test, drop-weight, coated panels, test method, coating toughness, Gosstandart, EASC.

FAQ

Q: What is this standard?

A: GOST 4765-73 is a Soviet-era / interstate standard that defines a laboratory method for determining the impact resistance of paint and varnish coatings — i.e., how well a dried coating resists mechanical impact without visible damage.

Q: What does it cover?

A: It covers specimen substrate specifications, coating application and conditioning, the impact apparatus and masses, stepwise drop procedure (or specified energy), visual assessment criteria for coating damage, and required reporting of results.

Q: Who typically uses it?

A: Paint/varnish manufacturers, QC and materials testing laboratories, R&D groups working on coatings, and procurement/specification engineers who need to verify coating durability against impact.

Q: Is it current or superseded?

A: The 1973 edition is listed in bibliographic sources as superseded/replaced; listings indicate a more recent replacement designated GOST 4765-2024. For current regulatory or contractual use, consult the successor standard and any national adoption notices.

Q: Is it part of a series?

A: Yes — the GOST designation aligns it with other test methods and standards for paints and varnishes (ICS 87.040). It followed an earlier 1959 version (GOST 4765-59) and later editions/amendments were recorded; the topic sits within a family of coating test standards used for mechanical, chemical and physical performance.

Q: What are the key keywords?

A: Impact resistance, drop-weight, falling weight, paints and varnishes, lacquer materials, coating toughness, coated panels, test method, GOST 4765-73.