Painted glass and tempered glass are two completely different glass products. Their core differences lie in their manufacturing process, performance, application scenarios, and decorative effects. The following analysis will explore these differences from multiple perspectives:
Painted glass and tempered glass are two completely different glass products. Their core differences lie in their manufacturing process, performance, application scenarios, and decorative effects. The following analysis covers multiple dimensions:
Process and Structural Differences:
Painted glass is a decorative glass formed by coating the glass surface with multiple layers of organic or inorganic coatings (such as polyester or epoxy resin) and then curing them at high temperatures.
Its process is essentially a coating adhesion technology. The coating thickness is typically between 0.1-0.5mm, allowing for monochrome, gradient, or patterned effects.
Tempered glass, on the other hand, uses physical (air cooling) or chemical (ion exchange) methods to create a compressive stress layer on the glass surface, with a tensile stress layer inside. According to the national standard GB15763.2-2005, the surface compressive stress of tempered glass must be ≥90MPa, and its impact resistance is 5-10 times that of ordinary glass. Its core process is stress strengthening and does not involve coating adhesion.
Performance Comparison
(1) Mechanical Strength
Tempered glass has a bending strength of 120-220 MPa, which is 3-5 times that of ordinary glass. It can withstand temperature changes of 200-300℃ without breaking. The strength of painted glass mainly depends on the base glass (usually ordinary float glass). The coating itself has no significant effect on improving strength, but it can prevent the glass from being scratched.
(2) Weather Resistance
Tempered glass has excellent chemical stability and can be exposed to ultraviolet rays and acid/alkali environments for a long time without performance degradation. The weather resistance of the coating of painted glass depends on the material: polyester coatings have an outdoor service life of about 5-8 years, and fluorocarbon coatings can last 10-15 years, but high temperature (>80℃) or strong acid/alkali environments may cause the coating to peel off.
(3) Safety
Tempered glass breaks into small, blunt-angled particles without sharp edges (meeting the fragmentation requirements of GB15763.2-2005), which is considered safety glass. The broken shape of painted glass is consistent with that of the base glass; if the base glass is ordinary glass, there is a safety hazard.
(4) Optical Performance: The light transmittance of tempered glass is similar to that of ordinary glass (approximately 88-92%), and it has virtually no impact on lighting. The light transmittance of painted glass depends on the coating color and thickness: transparent coatings have a light transmittance of approximately 80-85%, while dark coatings may reduce it to below 50%.
