Standards Development

Scope

This standard defines test methods and recommended requirements for the physical and mechanical characteristics of glass used in crystalline silicon PV modules.

The test methods specify how to measure physical characteristics of size and appearance, and mechanical characteristics of bending strength, surface stress, drop-ball impact resistance, and thermal shock resistance of PV glass.

This standard applies to thermally strengthened patterned and float glass used in photovoltaic modules. Other types of glass such as un-strengthened or chemically strengthened glass may refer to this document.

The glass may contain optical, anti-soiling, or a conductive-coating, as manufactured for use in a photovoltaic module. The optical performance and optical characteristics of the coatings are not covered in this standard.

This standard covers both front glass and back glass with/without holes with a typical thickness ranging from 1.6 mm to 4.0 mm in PV modules. Glass of other thicknesses may refer to this document.

Purpose

Research indicates that the glass in photovoltaic (PV) modules, serving as the rigid structure of the module, is subjected to external environmental stresses over its operational lifespan. These stresses primarily include mechanical stress and chemical corrosion caused by wind and snow loads, temperature, humidity, and clamp brackets, which can easily lead to performance degradation or even fracturing of the glass. Glass breakage not only leads to performance degradation and directly affects power generation but also poses safety hazards. Therefore, standardizing key strength testing methods and performance indicators for PV glass is essential.

This proposed standard outlines the test methods for the strength of photovoltaic glass, which can cover key performance indicators affecting the strength of PV glass. The test methods are defined by standardized equipment, sample specifications, test conditions, sample requirements, and test locations.

PV glass strength testing is primarily used for the assessment of glass strength, aimed at providing input conditions for the design of new PV module products, material selection, and load capacity evaluation by monitoring strength indicators at the material level. It also offers an effective and accurate means of monitoring the strength stability of PV module products in mass production. The proposed standard aims to provide a basis for stable and reliable PV glass strength performance and load capacity of PV modules through the definition of specific methods and recommended criteria.