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​​​Consistent with its commitment to contribute to a cleaner, healthier, and safer environment, Cummins Inc. has identified substances that are restricted and/or prohibited from our products. Consequently, suppliers must be aware of and adhere to these standards for materials or components supplied to Cummins.

Suppliers who provide any product or service to Cummins, Inc. are wholly responsible for the end product provided to Cummins irrespective of how many sub-suppliers (Tier 2, 3, etc.) may be in the supply chain. The end product supplied includes partially or fully finished assemblies, components, packaging, chemicals, and consumable processing substances. This further applies to all suppliers and joint ventures producing Cummins branded products.

It is the responsibility of the supplier to verify that the substances listed in CES 10​903​ are not in any products or materials supplied to Cummins per the referenced threshold. To view more details, please print the Cummins Engineering Standard 10903.

NOTE:  Access to the Cummins Engineering standard CES 10903 requires a login to the secure side of the Cummins Supplier Portal.  If you do not have an account on the Supplier Portal, contact the Supplier Help Desk.

For questions about prohibited substances or compliance with CES10903​ please contact Please do not send solicitations for business to this contact.  ​​

Prohibited Substances