ASTM G151-19 PDF

Full title and description

ASTM G151-19 — "Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources". This practice provides general procedures, device performance guidance, and interpretation advice for laboratory accelerated light exposures of nonmetallic materials (for example using xenon-arc, carbon-arc, or fluorescent UV laboratory sources). It emphasizes the limitations of simple acceleration factors and the best use of accelerated tests for comparative performance evaluation.

Abstract

G151-19 gives a practice-level framework for conducting accelerated light-exposure tests on nonmetallic materials. It covers general exposure procedures, recommended controls and reporting, device performance requirements, and guidance on interpreting accelerated exposure data (including cautions about direct time-acceleration extrapolation). The practice points users to device-specific standards for detailed operating methods and to statistical guides for handling variability.

General information

• Status: Active (current practice).
• Publication date: January 1, 2019 (last updated/recorded Feb 13, 2019).
• Publisher: ASTM International.
• ICS / categories: 19.040 (Environmental testing / weathering).
• Edition / version: G151-19 (designation G0151-19).
• Number of pages: 15 pages.

Scope

This practice covers general procedures for exposing nonmetallic materials in accelerated test devices that use laboratory light sources. It is intended to be used alongside device-specific standards (for example G152, G153, G154, and G155) which provide detailed operating requirements for open flame carbon arc, enclosed carbon arc, fluorescent UV, and xenon-arc apparatus respectively. The practice also addresses device performance characteristics and the interpretation and reporting of exposure data.

Key topics and requirements

• General exposure procedures and recommended test configurations for laboratory light-source devices.
• Performance requirements and characterization of exposure devices (to ensure reproducible laboratory exposures).
• Guidance on appropriate use of accelerated tests (comparative ranking, quality control) and cautions about direct time-acceleration conversions.
• Recommendations to include controls, report environmental and irradiance conditions, and apply statistical methods when relating laboratory and outdoor exposures.
• Statement of technical equivalence to ISO 4892 (relevant part) for laboratory light-source exposure concepts.

Typical use and users

Used by materials scientists, product developers, quality/control laboratories, accelerated weathering test equipment manufacturers, and regulatory/test bodies to design, run, and interpret laboratory light-exposure tests of plastics, coatings, adhesives, sealants, and other nonmetallic materials. Common applications include comparative ranking of formulations, batch quality checks, and prequalification testing.

Related standards

Device-specific and supporting standards commonly referenced with G151 include: Practices G152 (open flame carbon-arc), G153 (enclosed carbon-arc), G154 (fluorescent UV), and G155 (xenon-arc); Guide G141 (addressing variability in exposure testing); Guide G169 (statistical application to weathering tests); and related terminology and measurement standards (for example G113 and D5870). G151 is noted as technically equivalent in scope to the relevant part of ISO 4892.

Keywords

accelerated, exposure, light, ultraviolet, UV, xenon, carbon-arc, fluorescent UV, weathering, nonmetallic materials, durability, environmental testing.

FAQ

Q: What is this standard?

A: ASTM G151-19 is a practice (G151) that provides general procedures and guidance for exposing nonmetallic materials in laboratory accelerated test devices that use light sources. It addresses device performance, recommended practices for testing, and interpretation of results.

Q: What does it cover?

A: It covers general exposure procedures, device performance characteristics, recommended reporting and controls, cautions about acceleration factors, and guidance on using accelerated tests for comparative evaluation rather than absolute outdoor-life prediction. It points users to device-specific standards for operational details.

Q: Who typically uses it?

A: Test laboratories, materials and product development teams, manufacturers of nonmetallic products and accelerated exposure equipment, and organizations needing standardized methods for comparative weathering and durability evaluations.

Q: Is it current or superseded?

A: G151-19 is listed as the current/active version (designation G151-19) published on January 1, 2019 with ASTM's records showing a last-update/registration in February 2019; consult ASTM or your standards provider for any amendments or newer reprints.

Q: Is it part of a series?

A: Yes — it is part of a set of ASTM G15x practices and guides addressing laboratory and outdoor weathering of nonmetallic materials; device-specific practices (G152, G153, G154, G155) and statistical/variability guides (G141, G169) are commonly used together with G151.

Q: What are the key keywords?

A: accelerated, exposure, light sources, UV, weathering, nonmetallic materials, durability, xenon, carbon-arc, fluorescent UV.