ISO 11907-2-1995 PDF

Full title and description

St ISO 11907-2:1995 — Plastics — Smoke generation — Determination of the corrosivity of fire effluents — Part 2: Static method. This part specifies a small-scale, laboratory, static test procedure to assess the corrosive effects of combustion products from burning plastics and to rank materials by the corrosivity of their combustion products under defined test conditions (temperature, oxygen level, ventilation and humidity).

Abstract

Defines a laboratory static test using a sealed test chamber and a printed wiring‑board (PWB) corrosion detector with etched resistance tracks. Test specimens are ignited in a controlled ignition source and combustion products are condensed on the detector under specified temperature and humidity conditions; corrosivity is assessed from the change in electrical resistance of the detector after exposure (typical exposure: 60 minutes under specified conditions). The method produces a relative ranking of materials' smoke corrosivity.

General information

• Status: Withdrawn.
• Publication date: 22 November 1995 (first edition, 1995).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 13.220.40 (Ignitability and burning behaviour of materials and products); 83.080.01 (Plastics in general).
• Edition / version: Edition 1 (1995).
• Number of pages: 12 pages (English edition).

Scope

Specifies a static small‑scale laboratory apparatus and procedure for determining corrosive effects of combustion products from plastics. The test is intended to allow comparative ranking of materials’ fire-effluent corrosivity under controlled conditions (condensing and non‑condensing modes, specified chamber temperature and relative humidity, ignition source temperature and exposure time). The method focuses on corrosive attack on a standardized printed wiring board detector and is applicable to combustible materials tested as granules/chips or other specified sample forms.

Key topics and requirements

• Sealed cylindrical test chamber with controlled temperature and humidity to induce condensation where required.
• Ignition source: inert crucible with resistance‑wire heater; typical heat to ~800 °C for ignition.
• Corrosion detector: a printed wiring board (PWB) with etched resistance tracks (36 conductor tracks specified); initial and final resistance measurements used to assess corrosivity.
• Two exposure modes: condensing and non‑condensing, with specified chamber temperatures, relative humidity settings and conditioning procedures.
• Specimen form and mass requirements (examples: granules/chips, specified sample mass to allow multiple tests, e.g. individual specimens around 600 mg).
• Calibration and cleaning procedures for equipment and PWB detectors; avoidance of continuous in‑test resistance measurement to prevent electrochemical artifacts.
• Result interpretation: change in electrical resistance of the PWB (Ri and Rf) after a defined exposure interval (typically 60 min) used to rank materials by corrosivity.

Typical use and users

Used by fire‑testing laboratories, plastics manufacturers, materials engineers, OEMs of electrical/electronic equipment and certification bodies to evaluate and compare the corrosivity of smoke produced by plastic materials. The method supports material selection and risk assessment for applications where smoke corrosivity could damage electronic components, enclosures or downstream systems.

Related standards

ISO 11907 is a multi‑part series. Related parts and documents include ISO 11907‑1 (Guidance / General concepts and applicability; current consolidated edition published 2019), and other technical parts addressing dynamic decomposition methods (Parts 3 and 4). Users are advised to consult ISO 11907‑1 for general concepts and applicability and the current series status.

Keywords

plastics, smoke generation, fire effluents, corrosivity, smoke corrosivity, PWB corrosion detector, static method, test chamber, ignition source, condensation, resistance measurement.

FAQ

Q: What is this standard?

A: ISO 11907‑2:1995 is the static‑method test procedure for determining the corrosivity of combustion products (smoke) from plastics, using a small‑scale laboratory apparatus and a printed wiring‑board corrosion detector.

Q: What does it cover?

A: It covers apparatus, specimen preparation, test chamber conditioning (temperature and humidity), ignition source requirements, detector design (PWB with etched resistance tracks), exposure modes (condensing/non‑condensing), measurement procedures (initial and final resistance) and result reporting to permit comparative ranking of materials by smoke corrosivity.

Q: Who typically uses it?

A: Fire‑test laboratories, plastics and polymer manufacturers, electronics OEMs, materials engineers and certification/inspection bodies concerned with the potential corrosive effects of smoke on electronic components and systems.

Q: Is it current or superseded?

A: ISO 11907‑2:1995 is listed as withdrawn. For up‑to‑date guidance on smoke corrosivity concepts and applicability, consult ISO 11907‑1 (current edition published 2019) and any later ISO/TC 61/SC 4 publications; confirm the current status before applying the withdrawn procedure in a regulatory or certification context.

Q: Is it part of a series?

A: Yes. ISO 11907 is a series addressing smoke generation and corrosivity of fire effluents; Part 1 covers guidance/general concepts, Part 2 the static method (this document), and other Parts (3, 4) address dynamic decomposition methods. Users should review the full series for complementary methods and the current normative references.

Q: What are the key keywords?

A: Plastics; smoke generation; corrosivity; fire effluents; printed wiring board detector; static test; resistance measurement; condensing/non‑condensing modes; ignition source; ISO 11907.