### Cover Letter

Dear Sir or Madam: Enclosed please find the Premanufacture Notice (PMN) TS-B166Y2 for review. In accordance with 40 CFR Section 700.45(b), the fee of $2,500.00 has been paid via pay.gov. If there are any questions regarding this submission, please contact the technical contact for this PMN, Saadia Eltayeb at 202-828-8965. Sincerely, {XXX}

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XXX XXX XXX GPC and Slice Data_Sanitized.pdf

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### X 161923 CAS IES Report_Sanitized.pdf 

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XXX See Attachment 002 (Structure_Sanitized.pdf)

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XXX Siloxanes and Silicones, alkyl, alkyl propoxy ethyl, methyl octyl, alkyl polyfluorooctyl 

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Page 15 SANITIZED SUBMISSIONP10SB1(a)(4)1 Part II, Section B, 1(a)(4). Operation Site Locations

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Page 17 SANITIZED SUBMISSIONPage 18 SANITIZED SUBMISSION001 CAS IES Report_Sanitized CAS IES Report_Sanitized.pdf Pt.I, Sec.B, 2c. 5 002 Structure_Sanitized Structure_Sanitized.pdf Pt.I, Sec.B, 2e. 1 003 GPC and Slice Data_Sanitized GPC and Slice Data_Sanitized.pdf Pt.I, Sec.B, 2a. 11 004 FT-IR_Sanitized FT-IR_Sanitized.pdf 1 005 Process Diagram-sites controlled by others_Sanitized Process Diagram-sites controlled by others_Sanitized.pdf 1 006 MSDS_Sanitized MSDS_Sanitized.pdf 7

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### ATTACHMENT HEADER SHEET Attachment Number 001 Attachment Name CAS IES Report_Sanitized 

### Associated PMN Section Number

Pt.I, Sec.B, 2c. Does not contain CBI 

### Report Number EFKA120510287105414

### ATTACHMENT HEADER SHEET Attachment Number 002 Attachment Name Structure_Sanitized 

### Associated PMN Section Number

Pt.I, Sec.B, 2e. Does not contain CBI 

### Report Number EFKA120510287105414

### ATTACHMENT HEADER SHEET Attachment Number 003 Attachment Name GPC and Slice Data_Sanitized 

### Associated PMN Section Number

Pt.I, Sec.B, 2a. Does not contain CBI 

### Report Number EFKA120510287105414

### ATTACHMENT HEADER SHEET Attachment Number 004 Attachment Name FT-IR_Sanitized 

### Associated PMN Section Number

N/A Does not contain CBI 

### Report Number EFKA120510287105414

### ATTACHMENT HEADER SHEET Attachment Number 005 Attachment Name Process Diagram-sites controlled by others_Sanitized 

### Associated PMN Section Number

N/A Does not contain CBI 

### Report Number EFKA120510287105414

### ATTACHMENT HEADER SHEET Attachment Number 006 Attachment Name MSDS_Sanitized 

### Associated PMN Section Number

N/A Does not contain CBI 

### Report Number EFKA120510287105414