ASTM UV Resistance Test Standards: How to Choose G154 or G155

ASTM WEATHERING · METHOD SELECTION

Start With the Required Exposure, Not a Generic “UV Resistance” Label

A request for an “ASTM UV resistance test” does not yet tell a laboratory which lamp, cycle, endpoint or equipment to use. ASTM G154 concerns fluorescent ultraviolet apparatus; ASTM G155 concerns filtered xenon-arc apparatus. The material or customer specification must complete the test plan.

Use this page to identify the right standards route and prepare a technically useful chamber inquiry. For cycle design and result interpretation, read the separate fluorescent UV weathering guide.

Which ASTM UV Resistance Standard Applies?

The first choice is driven by the governing product document and the material failure being investigated. G154 and G155 describe different apparatus families; neither creates a universal pass/fail limit for every material.

For plastics, ISO 4892-3 addresses fluorescent UV exposure. For paints and varnishes, cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits addresses fluorescent UV exposure. These are related references, not automatic substitutes for an ASTM- or buyer-specified procedure.

A Four-Step Selection Path

If the requirement says only “UV resistance,” ask the responsible technical authority to define the intended exposure. An apparatus standard alone cannot decide whether a product passes.

Match the Material, Failure Mode and Governing Document

The same chamber can expose different materials, but the test question changes. Begin with the property that controls the engineering or purchasing decision, then identify the material-specific document that defines specimen preparation and evaluation.

A standards number in a purchase request is not enough when it only describes the apparatus. Ask which product specification or customer requirement turns the exposure into an acceptance decision.

Fluorescent UV or Xenon Arc: Choose From the Method and Failure Mechanism

The two technologies do not provide interchangeable versions of the same test. Fluorescent UV concentrates on selected UV spectral regions and is commonly combined with condensation or spray. Filtered xenon arc provides a broader spectrum when the governing method requires it. Neither is automatically the “faster” or “more accurate” choice for every product.

If customers in different markets cite different procedures, keep a requirement matrix by customer and destination. Do not combine exposures until the responsible technical authority has confirmed that the complete conditions and acceptance criteria are equivalent.

What a Test Order Must Define

A reproducible request records more than total hours. The laboratory needs the variables below in the approved test plan.

Write acceptance criteria before the test starts

Define what will be measured, the instrument or rating method, the initial baseline, the inspection interval and the allowed change. Color difference, gloss retention, surface ratings and mechanical-property retention are different decisions and should not be reduced to one generic “UV resistant” result.

Where the method calls for control materials or multiple specimens, include them in the capacity calculation and test record. Also define how interruptions, lamp changes, alarms and removed specimens will be handled in the final report.

Turn the Procedure Into an Equipment Proposal

The offered chamber should be reviewed against the complete program and specimen load, not merely a standards list in a brochure. Ask for a model-specific capability matrix covering the light source, control and measurement points, temperature and moisture functions, usable specimen positions, data export, calibration scope and site utilities.

If the approved method calls for fluorescent UV, compare the DERUI UV chamber range und der UV-beschleunigten Witterungstestsystems. If it calls for filtered xenon arc, see the cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits und der G155 versus ISO 4892-2 comparison.

Send the exact procedure and specimen drawing with your inquiry. DERUI can then review the required equipment configuration and identify any options that must be included in the quotation.

Evidence to Request Before Purchasing a Chamber

A quotation should show how the proposed configuration supports the approved program. Request evidence that can be checked before the purchase order and again during factory acceptance.

cURL Too many subrequests by single Worker invocation. To configure this limit, refer to https://developers.cloudflare.com/workers/wrangler/configuration/#limits

Is ASTM G154 the only ASTM UV resistance test?

No. It addresses fluorescent UV apparatus. ASTM G155 addresses xenon-arc apparatus. The governing material or customer method determines which exposure and evaluation are required.

Does either apparatus standard set a universal pass value?

No. A product specification or approved test plan must define the property, measurement method, exposure and acceptance criterion.

Can I compare two reports with the same number of test hours?

Not from hours alone. Compare the spectrum, control points, wetting, temperatures, specimens and evaluation method. Check reproducibility where results come from different apparatus.

Which details should I send for a chamber quotation?

Send the cited standard and edition, complete cycle, lamp or filter, specimen dimensions and quantity, evaluation method, reporting needs, site utilities and any customer acceptance requirements.

Review Your UV Test Requirement With DERUI

Share the governing method, exposure cycle and specimen details. We will use them to discuss the appropriate fluorescent UV or xenon-arc chamber configuration.

Send Test Requirements