GOST 19671-91 PDF

Full title and description

GOST 19671-91 — "Проволока вольфрамовая для источников света. Технические условия" (Tungsten wire for light sources — Specifications). The standard establishes technical requirements, marking, packaging and acceptance rules for drawn tungsten wire of group A (black) intended for use in electric lighting and related lamp components.

Abstract

This interstate (GOST) standard covers drawn tungsten wire produced by powder metallurgy in grades/brands used for lamp filaments and electrodes (notably grades VA, VM, VRN, VT-7, VT-10, VT-15). It specifies composition limits, diameter ranges and tolerances, mechanical and surface quality requirements, marking and packing, testing and acceptance criteria, and special provisions for wires containing thorium oxide.

General information

• Status: Active / действующий.
• Publication date: Designation year 1991 (GOST 19671-91); introduced into force on 01 January 1993.
• Publisher: IPK Publishing House of Standards (ИПК «Издательство стандартов») / interstate standard.
• ICS / categories: ICS 77.150.99 (products from non-ferrous metals) — classification: metals & wire products.
• Edition / version: Original issue 1991 (GOST 19671-91); replaces GOST 19671-81.
• Number of pages: Commonly published editions list ~43 pages (page counts may vary slightly between publishers/collections).

Scope

The standard applies to drawn tungsten wire of group A (black) produced by powder metallurgy for manufacture of light-source components — filaments and electrodes for incandescent, gas-discharge and certain other lamp types. It is intended for manufacturers of tungsten wire, lamp-component producers and quality-control laboratories engaged in lighting production.

Key topics and requirements

• Chemical composition and grades — specification of allowable impurities and special compositions for marked grades (VA, VM, VRN, VT-7, VT-10, VT-15), including provisions for thorium-containing grades.
• Dimensional range and tolerances — defined diameter ranges and manufacturing tolerances appropriate for lamp filament and electrode production; designation format includes grade, accuracy class, lamp type, kerning factor and diameter.
• Surface quality and cleanliness — requirements for surface appearance, removal of coatings (e.g., aquadag) and absence of contamination or defects that affect filament performance.
• Packing and marking — rules for spooling/coil packing (including requirements by diameter), labeling of coils and reels, and marking for items intended for long-term storage.
• Testing and acceptance — mechanical, dimensional and electrical tests; inspection criteria and sampling rules for lot acceptance.
• Radiation and safety provisions for thorium-doped wire — special handling, transport and storage precautions for wire with thorium oxide additive, including radiation-dose limits on packaging surfaces.

Typical use and users

Primary users are manufacturers of tungsten wire and lamp manufacturers (incandescent and certain gas-discharge lamp producers), component part suppliers, test laboratories and procurement/specification engineers in the lighting and electron-tube industries. The wire is used for filaments, cathodes, heaters and other high-temperature conductor elements in lighting and related devices.

Related standards

Related normative documents referenced by or associated with GOST 19671-91 include GOST 18903 (tungsten wire — assortment/sortament), standards on tungsten electrodes and other metal-product specifications, and national transport/ radiation-safety regulations referenced for thorium-containing products. These are commonly cited together in vendor and procurement documentation.

Keywords

GOST 19671-91, tungsten wire, lamp filament, powder metallurgy, VA VM VRN VT-7 VT-10 VT-15, marking, packaging, acceptance tests, thorium-doped wire, lighting industry.

FAQ

Q: What is this standard?

A: GOST 19671-91 is an interstate standard that sets specifications and technical requirements for drawn tungsten wire intended for light-source applications (filaments, electrodes), including composition, dimensions, surface quality, marking and packing.

Q: What does it cover?

A: It covers group A (black) drawn tungsten wire produced by powder metallurgy in specific grades (VA, VM, VRN, VT-7, VT-10, VT-15), defines allowed impurities, dimensional and surface requirements, testing and acceptance rules, packing/marking and special safety provisions for thorium-containing wire.

Q: Who typically uses it?

A: Wire manufacturers, lamp and lighting-component producers, quality-control and testing laboratories, procurement specialists and designers in the lighting and electronic vacuum-tube industries.

Q: Is it current or superseded?

A: The edition GOST 19671-91 is listed as active (действует) and was put into effect on 01 January 1993; it replaced the earlier GOST 19671-81. Users should verify with national/regional standards bodies or publishers for any later amendments or national adoptions.

Q: Is it part of a series?

A: It is related to other metal/wire standards (for example GOST 18903 series on tungsten wire assortment and related GOSTs for electrodes and metal products) and is part of the family of GOST documents governing tungsten products and lighting components.

Q: What are the key keywords?

A: Tungsten wire, lamp filament, powder metallurgy, marking, packaging, acceptance tests, VA/VM/VRN/VT grades, thorium safety.