GOST 9.050-75 PDF

Full title and description

ГОСТ 9.050-75 — Единая система защиты от коррозии и старения. Покрытия лакокрасочные. Методы лабораторных испытаний на стойкость к воздействию плесневых грибов. (English title: Unified system of corrosion and ageing protection. Varnish-and-paint coatings. Laboratory test methods for mould resistance).

Abstract

Standard specifies laboratory procedures for evaluating the resistance of paint and varnish coatings to growth and damaging action of mould (mould fungi). It defines sample preparation, inoculation and incubation conditions, scoring/assessment criteria and reporting of results to determine fungal resistance and fungicidal properties of coatings.

General information

• Status: Superseded / replaced (marked as replaced in later catalogs; current work continued in a 2021 revision of GOST 9.050).
• Publication date: Original approval 1975 (introduced into force 1 July 1976); later reissues and amendments published (notably reissue/updates in 2003).
• Publisher: State standards authority (Gosstandart / Interstate standard system — межгосударственный стандарт).
• ICS / categories: OKS / ICS areas: 19.040 (Testing) and 87.020 (Paints and varnishes / coatings).
• Edition / version: Original designation 9.050-75; issued as a 1975/1976 standard, with later reissues and amendments (including recorded amendments and a later 2021 revision under the same base number).
• Number of pages: Editions list between about 8 and 12 pages depending on reissue; older distributions commonly show ~8–10 pages.

Scope

Applies to varnish-and-paint coatings and establishes laboratory test methods for determining their resistance to mould (fungal) attack. The standard is intended to reproduce conditions favorable for fungal growth on coated samples, then evaluate the extent of growth and any coating deterioration or underlying corrosion, using defined scoring scales.

Key topics and requirements

• Definitions and applicability for paint and varnish coatings under the unified corrosion/ageing protection system.
• Preparation of test specimens (substrates, coating application and curing requirements) before biological exposure.
• Selection and preparation of fungal inoculum and nutrient media to create reproducible growth conditions.
• Controlled incubation conditions (temperature, humidity, exposure time) to promote mould development for assessment.
• Quantitative/qualitative scoring system for appearance change, surface growth and any substrate corrosion or coating failure (multi-level scales and criteria).
• Criteria for declaring a coating ‘fungistatic’ or ‘fungicidal’ (including observation of inhibition zones and scoring rules).
• Reporting format and reference normative documents (cross-references to related GOSTs and international methods such as ISO where applicable).

Typical use and users

Used by paint and coatings manufacturers for product development and quality control; independent testing laboratories performing conformity and durability tests; procurement and regulatory bodies specifying biological resistance requirements; and research institutions studying coating performance against biodeterioration. Also referenced in normative documents and technical specifications for coated products.

Related standards

Normative references and closely related standards include newer revision GOST 9.050-2021 (replacement/revision), ISO 846 (methods for assessing the action of microorganisms on plastics — historically linked), and other GOSTs in the unified corrosion/ageing protection series (for example GOST 9.048, GOST 9.049 and related test-method standards).

Keywords

ГОСТ 9.050-75; mould resistance; fungal resistance testing; paint coatings; varnish-and-paint; fungicidal; unified system of corrosion and ageing protection.

FAQ

Q: What is this standard?

A: ГОСТ 9.050-75 is a Soviet-era / interstate standard that defines laboratory methods for testing varnish-and-paint coatings for resistance to mould (mould fungi). It is part of the unified system of protection against corrosion and ageing.

Q: What does it cover?

A: It covers specimen preparation, fungal inoculation and culture conditions, incubation regimes, scoring/assessment scales for surface growth and coating deterioration, and reporting of test results to evaluate fungal resistance or fungicidal properties.

Q: Who typically uses it?

A: Coatings manufacturers, independent testing laboratories, certification bodies, research organizations and technical specification authors who need repeatable laboratory procedures for assessing mould resistance of paint systems.

Q: Is it current or superseded?

A: The original 9.050-75 text was issued in the mid‑1970s and has seen reissues and amendments; later work continued and a modern revision of GOST 9.050 was published in 2021, which serves as the current reference in many catalogs (the 1975/1976 edition is listed as replaced in standard registries).

Q: Is it part of a series?

A: Yes — it belongs to the “Unified system of corrosion and ageing protection” series of standards (the 9.0xx GOST group) dealing with testing and protective measures for materials and coatings. Related items include other 9.0xx standards referenced in the normative section.

Q: What are the key keywords?

A: Mould resistance, fungal testing, paint and varnish coatings, fungicidal, corrosion and ageing protection, laboratory methods, ГОСТ.