Pratt & Whitney continues to take a leadership role in the development of environmentally responsible products, services and operations.

Pratt & Whitney introduced the Green Engine Program in the 1990’s to focus our Design for the Environment efforts, with the goal to minimize the use of Materials of Concern (MOC) in Pratt & Whitney engine designs. This effort resulted in our latest family of engines being in the forefront of Green Engine technology in the aerospace industry.



Materials of Concern


It is the policy of Pratt & Whitney to eliminate or reduce the use of MOC in the design, manufacture, assembly, disassembly, maintenance, repair, overhaul, operation and disposal of our products. The Pratt & Whitney MOC lists identify materials that are prohibited or restricted for use in Pratt & Whitney products. The lists provide substance classifications in accordance with specification PWA 328 and CPW 625 for use during the product design approval process. Material or process substance use declarations are also based on the MOC lists, as applicable.

Pratt & Whitney Engines

Pratt & Whitney Canada Engines

To meet customer and regulatory compliance requirements, Pratt & Whitney depends on suppliers to submit and update Material Declarations on request, and to respond to material declaration requests for existing designs using the Material Declaration form above.

Pratt & Whitney’s declaration form is updated periodically to meet business needs, and additional forms may be developed for different types of suppliers. It is Pratt & Whitney’s intent to request the minimum level of information required to meet business needs. 

Reach Regulatory Compliance

Safe Use Communication


Article 33 in the REACH regulation requires that safe use information be communicated for Substances of Very High Concern (SVHC) when an article contains an SVHC in a concentration above 0.1 percent weight by weight (w/w). International Aerospace Environmental Group (IAEG) has developed user information for determining SVHC weight calculations. To date, Pratt & Whitney has identified the following SVHCs at greater than 0.1 percent w/w in articles:

CAS # Substance Name / Safe Use Information
110-71-4 1,2-dimethoxyethane, ethylene glycol dimethyl ether
9036-19-5  2-(2-[4-(1,1,3,3-Tetramethylbutyl)phenoxy]ethoxy)ethanol
80-05-7 4,4'-isopropylidenediphenol (BPA)
4,4'- Diaminodiphenylmethane (MDA)
Acids generated from chromium trioxide and their oligomers. Dichromic acid and Chromic acid
142844-00-6 Aluminosilicate refractory ceramic fibres
10043-35-3 Boric Acid
7440-43-9 Cadmium
Cadmium oxide
1333-82-0 Chromium trioxide
13560-89-9 Dechlorane plus
1303-86-2 Diboron Trioxide
24613-89-6 Dichromium tris(chromate)
540-97-6 Dodecamethylcyclohexasiloxane (D6)
7439-92-1 Lead
7758-97-6 Lead Chromate
12656-85-8 Lead chromate molybdate sulphate red
1317-36-8 Lead monoxide
12626-81-2 Lead titanium zirconium oxide
872-50-4 N-Methyl-2-pyrrolidone
127-19-5 N,N-dimethylacetamide (DMAc)
556-67-2 Octamethylcyclotetrasiloxane (D4)
11103-86-9 Potassium Hydroxyoctaoxodizincatedichromate
Sodium dichromate
7789-06-2 Strontium chromate
12141-20-7 Trilead dioxide phosphonate
61788-32-7 Terphenyl, hydrogenated

Supplier Assessments


To evaluate business continuity and compliance risk in our supply chain, Pratt & Whitney performs assessments of certain aspects of REACH at select suppliers. The assessment questionnaire is updated periodically to align with supply chain risk. 

Supplier Assessment Questionnaire

EU/UK REACH Authorisations

The REACH regulations require an Authorisation for continued use of Annex XIV Authorisation List substances in the European Economic Area and the UK after their assigned sunset dates. Because certain substances do not currently have suitable alternatives for use in all aerospace applications, Pratt & Whitney has worked with several industry consortia to obtain Authorisation to sustain supply chain business continuity. However, all members of our supply chain remain responsible for understanding and taking action on their obligations under REACH.

Additional Information

Additional information can be found using the links below: