Article, in particular air spring bellows, a metal-rubber element, or a vibration damper

An article comprising:

• a rubber mixture forming at least one layer of the article, the rubber mixture comprising at least one carbon black having a BET surface area according to DIN-ISO 9277 between 35 and 140 m2/g and an oil absorption number (OAN) according to ISO 4656 between 70 and 140 ml/100g, a first aluminum trihydrate (ATH_1) and at least a further aluminum trihydrate (ATH_2), wherein the first aluminum trihydrate (ATH_1) and the further aluminum trihydrate (ATH_2) each have a different particle size;
• wherein the particle size d50 of the first aluminum trihydrate (ATH_1) determined by laser diffraction is between 0.1 and 0.6 μm and the further aluminum trihydrate (ATH_2) has a particle size d50 determined by laser diffraction of between 0.9 and 1.5 μm;
• wherein the rubber mixture comprises 100 phr of CR or 100 phr of a blend of CR and NR (CR/NR) as the rubber component;
• wherein the amount of carbon black is 5 to 30 phr;
• wherein the first aluminum trihydrate (ATH_1) is incorporated in an amount of from 35 to 60 phr;
• wherein the at least one further aluminum trihydrate (ATH_2) is incorporated in an amount of from 80 to 120 phr;
• wherein the first aluminum trihydrate (ATH_1) and the at least one further aluminum trihydrate (ATH_2) are silanized;
• wherein the rubber mixture further comprises zinc borate incorporated in an amount of from 10 to 15 phr;
• wherein the rubber mixture further comprises 1,6-bis(N, N-dibenzylthiocarbamoyldithio)hexane;
• wherein the rubber mixture is free of halogen-containing flame retardants;
• and
• wherein the rubber mixture satisfies the Hazard Level 2 fire safety requirements according to fire safety standard EN45545;
• wherein the article is an air spring bellows, a metal-rubber element, a vibration damper, a damping element of a bearing of a bushing, a damping element of a multilayered spring, a damping element of a conical spring, a tubular body, or a drive belt.