GOST 33421-2015 PDF

Full title and description

GOST 33421-2015 — "Composite and cermet (metal‑ceramic) brake blocks for railway rolling stock. General specifications" (Russian: "Колодки тормозные композиционные и металлокерамические для железнодорожного подвижного состава. Общие технические условия"). The standard establishes technical requirements, test methods, marking, acceptance, packaging, transportation and storage rules for composite and metal‑ceramic brake blocks used on rolling stock for 1520 mm gauge railways.

Abstract

This interstate (GOST) standard specifies general technical conditions for manufacture, testing and acceptance of composite and cermet (metal‑ceramic) brake blocks intended for railway rolling stock operating in a wide ambient temperature range (approximately −60 °C to +60 °C) on 1520 mm gauge networks. It covers material and dimensional requirements, tribological performance (friction, wear, thermal stability), and requirements for marking, packaging, transportation and storage.

General information

• Status: Active / in force (interstate standard adopted and applied in the EAEU / member states).
• Publication date: Adopted 22 July 2015; last editorial/revision entry dated 11 October 2019; entry into force (effective) 1 February 2020.
• Publisher: Interstate Council for Standardization, Metrology and Certification (EASC) / Межгосударственный совет по стандартизации, метрологии и сертификации (published as a межгосударственный стандарт).
• ICS / categories: 45.060.20 (Railway rolling stock — trailer / rolling stock components).
• Edition / version: Original designation GOST 33421-2015 (with editorial activity in 2019; effective 2020-02-01).
• Number of pages: Approximately 35 pages (published electronic copies list 35–36 pages depending on format).

Scope

The standard applies to composite and metal‑ceramic (cermet) brake blocks intended for mainline rolling stock running on 1520 mm gauge railways. It is intended for products that must perform under ambient temperatures from about +60 °C down to −60 °C. GOST 33421-2015 sets out requirements that cover material composition and structure, geometric and dimensional characteristics, mechanical strength, friction characteristics and thermal stability, methods of testing (including braking tests and wear measurements), and rules for acceptance, marking, packaging, storage and transport.

Key topics and requirements

• Definitions and classification of composite and metal‑ceramic brake blocks.
• Technical and material requirements: permitted base materials, fillers, binders and allowable inclusions/impurities.
• Dimensional tolerances, mounting interfaces and design variants for different vehicle types.
• Tribological performance requirements: nominal friction coefficient ranges, thermal stability (change of friction under prolonged braking), and acceptable wear rates.
• Mechanical strength and resistance to cracking, delamination and thermal shock.
• Type and routine testing procedures — braking tests (including continuous braking simulations), mass loss (wear) measurements, and friction‑coefficient determination methods.
• Acceptance rules, sampling plans, inspection certificates and marking requirements.
• Requirements for packaging, handling, transportation and storage conditions (including climatic categories and temperature limits).

Typical use and users

Primary users include railway vehicle manufacturers, brake system and friction‑material producers, component suppliers, independent test and certification laboratories, maintenance and overhaul depots, railway infrastructure operators and regulatory authorities within the EAEU / member states. The standard is used when designing, approving and procuring brake blocks for mainline rolling stock on 1520 mm gauge networks.

Related standards

GOST 33421-2015 references and is used alongside other national and interstate standards for railway equipment and testing, for example standards on climatic categories and storage (GOST 15150-69), brake block holders and mounting interfaces (e.g., GOST 30632-99), marking and packaging of friction products (GOST 27513-87), and other rolling‑stock material and measurement standards commonly cited in railway braking regulations. It also complements standards covering cast‑iron brake blocks and other friction materials (see related GOSTs for braking components).

Keywords

brake block; brake pad; composite; metal‑ceramic; cermet; railway rolling stock; friction material; wear; thermal stability; braking test; 1520 mm gauge; GOST; EASC.

FAQ

Q: What is this standard?

A: GOST 33421-2015 is an interstate standard that defines general technical specifications for composite and metal‑ceramic brake blocks (brake pads) intended for railway rolling stock on 1520 mm gauge networks.

Q: What does it cover?

A: It covers material and dimensional requirements, tribological and mechanical performance (friction coefficient, wear, thermal stability), testing methods (including braking and wear tests), acceptance and sampling rules, marking, packaging, transportation and storage.

Q: Who typically uses it?

A: Railway vehicle manufacturers, brake‑material producers, component suppliers, testing and certification labs, maintenance depots and regulators in the EAEU / member states use this standard for production control, procurement specifications and type/routine testing.

Q: Is it current or superseded?

A: As published, GOST 33421-2015 is in force (effective from 1 February 2020) and is listed as an active interstate standard; no direct superseding standard is indicated in the public records reviewed. Users should check national registries for any amendments or replacement notices after the 2019–2020 editorial entries.

Q: Is it part of a series?

A: It is part of the set of GOST/GOST‑interstate standards addressing railway braking components and friction materials; related GOSTs cover cast‑iron brake blocks, holders, climatic categories and measurement/testing methods that together form the normative framework for brake components.

Q: What are the key keywords?

A: Composite brake blocks, metal‑ceramic (cermet) brake blocks, friction material, brake pad, wear, friction coefficient, thermal stability, braking tests, 1520 mm gauge.