How to identify glass after heat dip treatment?

Tempered glass is widely used in the construction and automotive industries due to its high strength and safety. However, untreated tempered glass can pose a risk of spontaneous breakage. Heat soaking is an effective solution to significantly reduce this risk. This article will introduce how to identify heat-soaked tempered glass.

Principle of Heat Soaking:
Heat soaking, also known as homogenizing treatment, is a post-processing technique for tempered glass. It involves heating the glass to 290℃±10℃ and maintaining this temperature for a certain period. This process accelerates the phase transformation of nickel sulfide impurities within the glass, thereby preemptively releasing the potential risk of spontaneous breakage during use.

Methods to Identify Heat-Soaked Glass

Marking Inspection:Heat-soaked glass typically has specific markings or labels, which may include the manufacturer's trademark, the date of heat soaking, or a special code. These markings can be found on the edges or corners of the glass.

Visual Observation:Although heat-soaked glass appears similar to regular tempered glass, the heat soaking process may leave tiny marks or changes on the glass surface in some cases. These subtle differences can be detected through careful observation.

Professional Testing:For precise identification, professional equipment and techniques can be used. For example, a microscope can check the nickel sulfide phase change within the glass, or spectral analysis can be employed to evaluate whether the glass has undergone heat soaking.

Consulting the Manufacturer:Directly consulting with the glass manufacturer or supplier is another reliable method. Reputable manufacturers will provide detailed product information, including whether the glass has been heat-soaked and the associated quality assurances.

Performance Testing:Heat-soaked glass exhibits enhanced performance, especially in terms of resistance to spontaneous breakage. Comparative tests, such as thermal shock tests or mechanical strength tests, can be conducted to assess the glass's performance.

Heat soaking is an important process to improve the safety of tempered glass. Although it might be challenging for ordinary consumers to directly identify heat-soaked glass, the methods described above can increase awareness and confidence in heat-soaked glass. When selecting tempered glass products, knowing whether they have been heat-soaked is crucial, as it relates to the final product's safety and reliability.