1、 ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberDate Action Revisions1978 05 22 Metriated and Retyped CAH1-RD572066-361973 07 05 Released AC1-6000-328WP 3948-a Page 1 of 5SEALER, MONOBAKE - THUMBABLE GRADE ESB-M4G198-A1. SCOPE:The material defined by this specification is a viny
2、l resin base, solventfree, thumbable, low temperature (121 C) curing sealer. It is a monobakesealer which can be applied prior to painting and cured with the paintduring the normal bake schedule.2. APPLICATION:This specification was released originally for materials used for sealingand feathering al
3、l lap joints and voids such as corners of backliteopenings. This sealer is applied in daubs over freshly baked electrocoatprimer and cured with the enamel topcoat at relatively low temperaturecure schedules (minimum metal temperature of 118 C for 5 min). It mayalso be effectively used over phosphate
4、 coated or oily metal at all curetemperatures from 121 - 204 C.3. REQUIREMENTS:3.1 UNCURED SEALANT PROPERTIES3.1.1 Color Off white3.1.2 Weight Per Volume(ASTM D 816)The weight tolerance for any one supplier shall be +/- 0.2lb/gal (0.024 kg/l), based on the weight of the originalapproved production s
5、amples (See para 5.2).3.1.3 Cone Penetration ( Unworked)(ASTM D 217, 150 g total load)Bulk or Extruded . As received 5.0 - 20.0 mm. Aged 72 h at 43 C 5.0 - 20.0 mm3.1.4 Solids, min 99%(ASTM D 2834, 3 h at 102 +/- 3 C)3.1.5 Inverted BakeNo evidence of cracks, separation from metal or loss ofmaterial
6、when tested as outlined below.Test Method. Apply two 1 x 8 x 3/16 in (25 x 200 x 5 mm) ribbons ofsealer to a phosphate coated (ESB-M3P1) and electrocoatprimed ESB-M64J12 (See para 5.3) 12 x 12 x 0.035 in (300x 300 x 0.89 mm) CRLC steel panel.ENGINEERING MATERIAL SPECIFICATION ESB-M4G198-AWP 3948-b P
7、age 2 of 5. Invert panel and air dry for 15 min at 23 +/- 2 C. Heat phosphate coated and electrocoat primed(ESB-M64J12) panel in inverted position for 30 min in amechanical convection oven maintained at 121 +/- 3 C.3.1.6 QualityThe material shall be a smooth homogeneous mixture freefrom foreign mate
8、rials and properties detrimental to normalproduction operations.3.2 CURED SEALANT PROPERTIES3.2.1 Hardness, Durometer “D“ 15 - 40(ASTM D 2240)Test Method: Flow enough material into a container (suchas an ointment tin) or use an extrusion as received, togive a cured section 0.25 in (6.4 mm) thick. Ba
9、ke in amechanical convection oven for 30 min at 121 +/- 3 C.Remove from the oven. Four hours after removing the testmaterial from the oven, check the hardness. Save sample fornext test.3.2.2 Contraction or Expansion During CureThe material shall not pull away from sides or show morethan slight evide
10、nce of overflow.Test Method: Examine the sample prepared in para 3.2.1 forconformance to this requirement.3.3 CURED SEALANT PROPERTIES ON SUBSTRATE3.3.1 Cure CharacteristicsThere shall be no evidence of plasticizer migration,cracking, loss of flexibility, or failure to adhere tooily, phosphate coate
11、d, or electrocoated metal. The sealershall not cause tackiness of primer or topcoat, ordiscoloration of the topcoat after exposure to currentproduction baking schedules.Test Method “A“: Phosphate coated panels (meet ESB-M3P1requirements). Apply two 0.187 x 1 x 10 in (4.7 x 25 x 250 mm) ribbonsof sea
12、ler equally spaced for balance on a 12 x 12 x0.035 in (300 x 300 x 0.89 mm) CRLC steel panel. Spray with currently released primer surfacers(ESB-M6J102 Red and ESB-M6J103 Gray). Bake in a mechanical convection oven at an ambient airtemperature of 135 +/- 3 C for 15 min to achieve aminimum metal temp
13、erature of 135 C for 5 min. Cool to 23 +/- 2 C and examine. Spray with currently released Light Tan Metallic enamel(ESB-M50J100 quality).ENGINEERING MATERIAL SPECIFICATION ESB-M4G198-AWP 3948-b Page 3 of 5. Bake as above for 30 min at 121 +/- 3 C to achieve aminimum metal temperature of 118 C for 5
14、min. Cool to 28 +/- 2 C and re-examine for any of the aboveconditions. Insert the tip of a sharp knife under theedge of the sealer ribbon and cut a tab 1.5 in (38 mm)long. Grasp the tab and attempt to peel at 180 along the 10 in (250 mm) dimension. Observe for anyindication that the ribbon fails to
15、adhere, is brittle,or friable.Test Method “B“: Electrocoated panels (meet ESB-M64J12requirements) Repeat Method “A“, eliminating steps 2, 3,and 4.Test Method “C“: Oily metal panels (0.2 cm 3 /sq ft (2.2cm 3 /m 2 ) repeat Method “A“, eliminating steps 2, 3, 4, and 5Save all panels for low temperature
16、 resistance test ( para3.3.3).3.3.2 Heat StabilityNo evidence of cracking, charring, embrittlement, ordegradation when exposed to high temperatures.Test Method: Proceed as outlined in par 3.3.1 Methods “A“& “C“ except use a bake cycle of 30 min at 204 +/- 3 C.(Simulates production over bake).Save sa
17、mple for Low Temperature Resistance Test ( para3.3.3)3.3.3 Low Temperature Resistance No cracking or(FLTM BV 1-2) adhesion failure.Test Method: Condition the panels prepared in para 3.3.1and 3.3.2 for 7 days at 70 +/-1 C. Place the panels in theslamming apparatus and condition for 4 h at -29 +/- 1 C
18、.The panels shall be slammed a total of 10 times.3.3.4 Staining(FLTM BV 7-2)No staining or other deleterious effects on light coloredenamel after exposure as below.Test Method: Apply a 0.060 x 1 x 6 in (1.5 x 25 x 150 mm)ribbon of sealer to two 3 x 9 x 0.035 in (75 x 225 x0.89 mm) phosphate coated (
19、ESB-M3P1) and electrocoat primed(ESB-M64J12) CRLC steel panels. Proceed as outlined inpara 3.3.1 except use white ESB-M50J100 quality enamel.After bake, condition for 24 h at 23 +/- 2 C. Mask onehalf of the sealant ribbon and expose one panel for 500 hin the fluorescent sunlamp cabinet as specified
20、in FLTM BV7-2. Examine the exposed and unexposed portions of thesealant. (Save one panel for the weatherability test).ENGINEERING MATERIAL SPECIFICATION ESB-M4G198-AWP 3948-b Page 4 of 53.3.5 Weathering(FLTM BO 1-1)No staining or other deleterious effects on light coloredenamel after exposure as out
21、lined below.Test Method: Expose the second panel prepared in para 3.3.4for 500 h in an Atlas XW Weatherometer with a cam cycle of102-18.3.3.6 Shear Adhesion, min 200 psi (1.4 MPa)(ASTM D 1002, 1 in (25.4 mm)Overlap, pull at 1 in (25 mm)/min)Test Method. Apply a 0.010 in (0.25 mm) coating of the test
22、 materialover 1 sq in (6.5 cm 2 ) area on two oily, phosphatecoated (ESB-M3P1) or primed with ESB-M64J12 electrocoatprimer (see para 5.3) 1 x 5 x 0.035 in (25 x 125 x0.89 mm) steel panels. Place two oily, phosphate coated (ESB-M3P1) orelectrocoat primed (ESB-M64J12) CRLC steel panels overthe two pre
23、viously prepared panels, so that the bondedarea equals 1 sq in (6.5 cm 2 ). Place a 1 lb (0.45 kg) weight on each assembly and bakeat 121 +/- 3 C for 30 min. Cool the assemblies to 23 +/- 2 C before removing theweights. Four hours after removing the weights, determine theshear adhesion in a tensile
24、tester at a rate of 1 in (25mm)/min.3.7 SUPPLIERS RESPONSIBILITYMaterial supplied to this specification must be equivalent to thatoriginally approved. Changes in formulation or processing shallnot be made without prior approval as described in SupplierProcedure I-A.4. APPROVAL OF SUPPLIERS:Suppliers
25、 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.EN
26、GINEERING MATERIAL SPECIFICATION ESB-M4G198-AWP 3948-b Page 5 of 55. GENERAL INFORMATION:The material data included herein is for information only and is not arequirement for the supplier.5.1 STORAGE STABILITYThe material shall be stored at temperatures below 38 C away fromall sources of heat and su
27、nlight. Heat greatly accelerates aging.Under these storage conditions, the minimum shelf life of thematerial shall be 3 months. When these materials are stored attemperatures below 23 C, they shall be conditioned at roomtemperature prior to application. Adequate conditioning permitsthe material to obtain its optimum application properties.5.2 WEIGHT PER VOLUMEMaterials conforming to this specification range from 11-13 lb/gal(1.3 - 1.6 kg/l).5.3 ELECTROCOAT PRIMERESB-M64J12, Black - Fresh Primed (1 h maximum after bake).
