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Preferred Materials and Processes

Solvent Cleaning
low voc

Subject: Pre-Seal and Post-Seal Solvent Cleaning

BAC 5000 General Sealing, Revision W, 17-JAN-2000
BAC 5030 Smoothing and Fairing, Revision G, 31-JAN-1992
BAC 5504 Integral Fuel Tank Structure Sealing, Revision P, 30-SEP-03

Description of Problem:
Environmental regulations in many areas require use of products with lower vapor pressure. New products have been qualified. Many require process adjustment. This information sheet is designed to provide detailed information not included in process specifications.

This does not supersede specification requirements or the qualified products list.

Manufacturing Information:
Using low vapor pressure solvents for seal cleaning

Pre seal cleaning
Low vapor pressure solvents evaporate slowly and can be easily trapped in cracks and faying joints. Seal will not stick to damp, solvent soaked surfaces. Solvent is not to be left to dry on the assembly but should be wiped dry with an approved clean rag before sealing per spec.

Preventative Cleaning
Removal of cured sealant from structure is difficult and leaves a stain that may or may not come off with the use of solvents. To eliminate time consuming cleaning operations down stream, it is recommended that excess and stray sealant be removed while the sealant is still wet with an approved solvent. MPK is a good low vapor pressure alternative for cleaning wet seal.

BAC 5000 Section 5 Qualified Solvents with vapor pressure less than 45 mm Hg
Note: Several of the cleaners are not allowed as the final clean prior to applying the sealant. Confirm vapor pressure with your supplier prior to use.

Solvents & Solvent Mixtures

Methyl Propyl Ketone (MPK)1,2

BMS 11-7 Type II1,2

Isopropyl Alcohol2

Methyl Ethyl Ketone/sec-Butyl Alcohol blend2


Toluene TT-T-548

Naphtha TT-N-95 Type 21

(vapor pressure varies)


d-Limone based

Biogenic SE377C 2

Citra Safe 1,2

GlBDSafe Prepsolv

1-Also qualified to BAC 5030

2-Also qualified to BAC 5504

The information provided in this website is intended to assist suppliers to the Boeing Company. Although every effort has been made to ensure its accuracy, we cannot warrant its accuracy for use in environmental compliance matters. You should check with your local, state, or Federal regulatory agencies if you have questions regarding the proper procedures or other matter related to compliance.

Safety Reminder:
Refer to Manufacturer's material safety data sheets, or contact the manufacturer for safety and health information pertaining to hazardous materials.

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