1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Revisions1979 05 21 Metricated and Retyped CAHI-RD 572066-2191963 07 02 Released ASI 965WP 3948-a Page 1 of 2SEALER, FOR SHEET METAL SCREWS ESB-M4G80-A1. SCOPE:The material defined by this specification is a brown color
2、ed compoundedwax or thermoplastic sealing material resistant to moisture.2. APPLICATION:This specification was released originally for material used on thethreads of sheet metal screws where a moisture resistant seal isrequired.3. REQUIREMENTS:3.1 SOFTENING POINT, min 149 C(ASTM E 28, using castor o
3、il)3.2 PAINT STAININGShall not show any migration staining after 72 h exposure.Test Method: Samples of sealing compound are secured tightly toproduction enamel surface and placed in the fluorescent sunlampfixture as described in FLTM BV 7-2.3.3 WATER LEAKAGE TEST No leaks permitted3.3.1 As Received
4、After 4 h under a 1 in (25 mm)static head of water3.3.2 Aged 7 days at After 4 h under a 1 in (25 mm)70 +/- 1 C static head of water3.3.3 Cold Shocked After 4 h under a 1 in (25 mm)static head of water, and aftertest panel has been slammed 6times,following 24 h at -29 C inslam fixture as described i
5、n FLTMBV 1-13.3.4 Aged 50 min at After 4 h under a 1 in (25 mm)116 +/- 3 C static head of waterTest Method: Screws shall be driven into test panels 0.035x 5 x 12 in (0.89 x 125 x 300 mm) using stainless steelshim stock. The pilot holes shall be as specified by theFord Standard for metal tapping scre
6、ws as well as theclearance holes for the stainless steel shim stock. Screwsshall be turned full-in and shall not exceed normal torquevalues. Shim stock thickness shall be adjusted so thatbottoming-out of screws does not occur.ENGINEERING MATERIAL SPECIFICATION ESB-M4G80-AWP 3948-b Page 2 of 23.4 COH
7、ESION AND ADHESIONShall provide cohesive properties so that handling and shippingdoes not separate the material, and it will form a suitable sealingmound around screw holes as the screws are driven in.The adhesion to metal shall be in excess of the cohesive strengthso that the desired sealing proper
8、ties will be maintained.3.5 STORAGE STABILITYThe material as supplied on screws shall withstand a plant storagelife of 12 months without deterioration provided storage heat isnot in excess of 66 C.3.6 SUPPLIERS RESPONSIBILITYMaterial supplied to this specification must be equivalent to thatoriginall
9、y approved. Changes in formulation or processing shallnot be made without prior approval as described in SupplierProcedure I-A.4. APPROVAL OF SUPPLIERS:Suppliers to this specification must be approved by the affected productengineering office. Procedure for gaining approval of a specificmaterial to a new/existing ES-M specification is contained in SupplierProcedure I-A. Approved new suppliers will be added to the EngineeringMaterials Approved Source List.
