Chemtan Company Leather Chemistry, Leather Chemicals, Chemtan Company, Inc., Chemtan, CHEMTAN, Exeter, Exeter, New Hampshire, Chemicals for Tanning, Tanning Chemicals, Leather Tanning, Retanning Chemicals, Leather Experts, Leather Expert Chemtan, headquartered in New Hampshire, USA, is an international leader in developing, producing and marketing chemicals for the leather tanning industry.