Mastika is made of rubber, asphalt, rubber, minerals and other fillers, and an appropriate amount of flame retardant is added. It has the characteristics of flame retardancy after drying.

(1) Color: Black

(2) Average density: 1300±100kg/m3

(3) Flame retardancy: no ignition property during construction, flame retardancy after drying, self-extinguishing after leaving the fire source for 1 second

(4) Heat resistance: incline at 45° for 4 hours at 95°C, and at 45° for 1h when the temperature rises to 120°C, no flow or foaming

(5) Water absorption rate: soaked at room temperature for 24 hours, the water absorption is not more than 0.5% of the weight of the sample

(6) Freezing resistance: placed at -60°C for 2 hours, no abnormality in appearance, no cracking, no falling off;

(7) Drying time: 5 hours for dry, 7 days for full dry

(8) Volatile matter: ≤ 30%

(9) Bonding strength: ≥0.25MPa (20℃)

(10) Elongation: ≥3%

(11) Operating temperature: -60～+80℃