The German standard DIN5510 is one of the most commonly used standards for fire and smoke safety testing of domestic and international rail vehicle materials. What do many customers mean and require for the German standard DIN5510 combustion level S5? The burning level S5 is the highest level of the German standard DIN5510 test. The DIN5510 standard not only requires the material to have fire resistance and flame retardant properties, but also needs to have low smoke and low toxicity properties