GOST 11507-78 PDF

Full title and description

GOST 11507-78 — Petroleum bitumens. Method for determination of Fraas (Fraass) break point. (Russian: «Битумы нефтяные. Метод определения температуры хрупкости по Фраасу»).

Abstract

This standard specifies the Fraas (Fraass) brittle-point test for petroleum bitumens: a low-temperature test in which a thin bitumen film on a steel strip is cooled and periodically bent until cracks or fracture appear; the temperature at which cracking occurs is recorded as the Fraas break (brittle) point. The method is intended to characterise bitumen low‑temperature behaviour for quality control and formulation of asphalt and related products.

General information

• Status: Historically established USSR GOST; listed as the 1978 method for Fraas brittle point and available in technical collections/reference services (commonly treated as an active/reference method in legacy documentation).
• Publication date: Approved 11 December 1978; date of mandatory introduction established 1 January 1980 (designation includes year 1978).
• Publisher: Государственный комитет СССР по стандартам (Gosstandart of the USSR) — State Committee for Standards (USSR).
• ICS / categories: 75.140 (Waxes, bituminous materials and other petroleum products / bitumen test methods).
• Edition / version: Original issue GOST 11507-78 (1978); the text is known to have received subsequent textual amendments in later years (amendments noted in standard collections).
• Number of pages: Typically published as a short test method (approx. 7 pages in common electronic reproductions).

Scope

This standard applies to petroleum bitumens and establishes the laboratory test procedure for determining the Fraas (Fraass) brittle point — the temperature at which a bitumen film cracks under specified cooling and bending conditions. It is used to assess bitumen low‑temperature brittleness for product specification, quality control and comparative testing.

Key topics and requirements

• Test principle: cooling of a thin bitumen coating on a steel strip and periodic bending until the first visible crack or fracture occurs; the temperature at that moment is recorded as the Fraas break point.
• Apparatus: Fraas bending device (concentric tubes with captive clamps), Dewar or cooling bath, thermometer (mercury thermometer or low‑inertia thermocouple) and plate‑heating/melting device for sample preparation.
• Sample preparation: melting and deaeration of bitumen, application of a controlled thin layer to steel strips of specified dimensions, conditioning before testing to ensure uniform coating.
• Cooling medium and control: use of alcohol, iso-octane or other approved cooling mixtures in a Dewar/cooling assembly; controlled cooling rate and monitored sample temperature.
• Measurement and reporting: report the Fraas break temperature (°C) and relevant test conditions (sample ID, apparatus type, thermometer/thermocouple specification, cooling medium); test precision is governed by thermometer/thermocouple accuracy and method reproducibility described in the standard.

Typical use and users

Used by petrochemical laboratories, bitumen producers, asphalt and road‑construction material manufacturers, research laboratories and conformance/quality control laboratories. Typical applications include product specification, acceptance testing, formulation development, and comparative evaluation of low‑temperature performance of binders.

Related standards

This method belongs to the GOST test family for petroleum bitumens (examples include GOST 11501-78 — penetration test; GOST 11505-75 — ductility; GOST 11506-73 — softening point by ring and ball). Equivalent/related international and regional standards exist for the Fraas method (for example EN 12593 which specifies a Fraass breaking‑point determination for bitumens and bituminous binders). Users commonly consult these related methods for a complete low‑temperature and rheological characterization program.

Keywords

GOST 11507-78; petroleum bitumen; bitumen brittle point; Fraas; Fraass break point; low-temperature test; bitumen test method; asphalt binder; quality control.

FAQ

Q: What is this standard?

A: GOST 11507-78 is a USSR national standard (1978) that defines the laboratory method for determination of the Fraas (Fraass) brittle point of petroleum bitumens — the temperature at which a cooled bitumen film first cracks under specified bending.

Q: What does it cover?

A: It covers apparatus, sample preparation, cooling arrangements, test procedure (periodic bending during controlled cooling), measurement and reporting conventions for determining the Fraas break temperature of bitumens.

Q: Who typically uses it?

A: Petrochemical and materials test laboratories, bitumen producers, asphalt/construction materials manufacturers, and researchers concerned with low‑temperature behaviour of bituminous binders.

Q: Is it current or superseded?

A: GOST 11507-78 is the 1978 USSR method and remains the reference for that historical series of GOST test methods; its current status in any specific country or regulatory system may vary. In practice, many laboratories refer to either this GOST text (or its later amendments) or to comparable interstate/national standards; modern regional practice may use updated international/European methods such as EN 12593 for Fraass testing. Users should check the applicable national/regional standards catalogue to confirm whether a more recent national or interstate replacement applies.

Q: Is it part of a series?

A: Yes — it is part of a family of GOST methods for petroleum bitumens (penetration, ductility, softening point, flash point, etc.), commonly used together to characterise binder properties. Examples include GOST 11501-78 (penetration), GOST 11505-75 (ductility) and GOST 11506-73 (softening point).

Q: What are the key keywords?

A: Bitumen, Fraas/Fraass, brittle point, low‑temperature brittleness, GOST 11507-78, test method, petroleum bitumen, binder testing.