What are the factors that affect stress spots on tempered glass?

     To solve the problem of stress spots on tempered glass, it is necessary to start with understanding its causes, and then take corresponding preventive measures, cleaning and repair methods, as well as daily maintenance recommendations.

Structure of multiple glass layers stacked together

      For example, the stress spot of 6G/1.52PVB/6G+12A+8G insulated laminated tempered glass is more severe than that of ordinary insulated tempered glass, mainly due to the visual effect of interference fringes caused by the superposition of multiple glass pieces. When light passes through a piece of tempered glass, it has already produced partially polarized light. After passing through a second piece of tempered glass, the polarized light overlaps, and the more tempered glass it passes through, the more severe the overlapping phenomenon becomes. When multiple pieces of tempered glass are stacked and stacked in a glass processing plant, this phenomenon can be seen. Simply put, it is like two combs stacked together. When the direction of the comb teeth is the same, more light is transmitted, and when the direction of the comb teeth is perpendicular, less light is transmitted.

Environmental factors and lighting conditions

     This type of interference fringes will appear more pronounced in environments with more polarized light. Ordinary sunlight does not contain polarized light, but the diffuse reflection light from surrounding buildings, after being heavily scattered by clouds, dust, and soil, will produce polarized light. The more polarized light produced, the more pronounced the stress spot fringes will be.

Glass with high transmittance and low reflectivity

     When the transmittance of glass is high and the reflectivity is low, the reflected background light is weak and cannot suppress the light of stress spots, so the stress spots appear more obvious. If the reflectivity of glass is high and the reflected background light is bright, it will drown out the light of stress spots.

The influence of indoor lighting

     When the interior is not yet decorated, it belongs to a dark environment. At this time, stress spots are more obvious when observing the glass. This is because the interior walls, ceilings, and floors are rough and gray, absorbing light, and there is almost no diffuse reflection of light emitted from the interior, which highlights the brightness of stress spots.

Observation angle

     The smaller the observation angle, the longer the optical path of light propagation in glass, and the higher the probability of generating interference fringes.