Lignin-based filler containing halobutyl rubber compositions with no or reduced amount of oil-based softening agents

A curable rubber composition comprising as constituents, which are different from one another,

• at least one halobutyl rubber, which is curable by means of at least one curing agent, at least one curing agent, which is suitable for curing the at least one halobutyl rubber,
• at least one lignin-based filler F1, which is different from carbon black, and which has an STSA surface area of up to 200 m2/g, and
• at least one resin R1 being selected from i) aromatic resins except of phenolic resins, ii) aliphatic resins, and iii) mixtures thereof,
• wherein the total amount, in phr, of said at least one resin R1 being present in the composition exceeds the total amount, in phr, of any of paraffinic oils, naphthenic oils and aromatic oils, each being optionally also present in the composition.