INTERSTATE Quality standards:
- ISO-9001 International Standards Organization
- DOT Department of Transportation of U.S.A.
- TϋV Independent German test facility
- E-Mark European Economic community
- EC Tire Road noise emission sound approval
- C.C.C. China Compulsory Product Certification
- S symbol EU Sound approval
- GSO / GCC Conformity Certificate
- NOM certificate Norma Offcial Mexicana
- INMETRO Brazilian certification
