1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions/Release 2009 10 14 N STATUS Replaced by Global Strategy B. Witkowski, NA 1978 11 03 Metricated, Renumbered 8 min at 135 +/- 3 C) and high temperature (minimum metal temperature; 5 min at 163 C) bakes. 2. APP
2、LICATION: This specification was released originally for material used on bodies-in-white to seal welded joints such as roof headers and reinforcements. 3. REQUIREMENTS: 3.1 COLOR Tan or reddish brown 3.2 CONSISTENCY (ASTM D 1321, 50 g total load) 3.2.1 As Received 6.5 - 7.5 mm 3.2.2 Aged 5.0 - 7.5
3、mm (72 h at 43 +/- 1 C) 3.3 SPECIFIC GRAVITY (Uncured material), max 1.50 (ASTM D 297, water displacement method) 3.4 SOLIDS, min 99% (ASTM D 2834, except heat for 3 h at 102 +/- 3 C in a mechanical convection oven) 3.5 VOLUME EXPANSION, min 100% Test Method: Determine the volume of a 1 x 2 in (25 x
4、 50 mm) x 20 gage CRLC steel coupons by water displacement. Apply a 1 x 3/8 x 3/8 in (25 x 9.5 x 9.5 mm) length of uncured material to the coupons and determine the combined volume by water displacement. Use light finger pressure in applying the material to minimize distortion of the test specimen.
5、Cure the assembly in a mechanical convection oven at an ambient air temperature of 135 +/- 3 C for 15 min. The assembly shall be exposed in a horizontal position, centrally located and protected from direct air flow. Repeat the above procedure except cure the assembly for 15 min at 177 +/- 3 C. ENGI
6、NEERING MATERIAL SPECIFICATION ESB-M4G152-B WP 3948-b Page 2 of 5 To insure the proper cure schedule, place the test samples on a 12 x 12 x 0.035 in (300 x 300 x 0.89 mm) CRLC steel panel before placing in the oven. Cool the specimens to 23 +/- 2 C and determine the volume of the expanded material.
7、Calculate the volume increase as percentage of the original volume as follows: V2- V1% Volume Expansion = - x 100 V1- VcVc- Volume of steel coupon V1- Volume of uncured material and coupon V2- Volume of coupon and material after cure 3.6 WATER ABSORPTION, max 3.0% Test Method: Weigh an aluminum coup
8、on 4 x 1 x 0.030 in (100 x 25 x 0.76 mm) to the nearest 0.001 g. Apply a 1 x 3/8 x 3/8 in (25 x 9.5 x 9.5 mm) length of uncured material to the center of the coupon. Use light finger pressure in applying the material to minimize distortion of the test specimen. Cure the assembly in a mechanical conv
9、ection oven at an ambient air temperature of 135 +/- 3 C for 15 min. The assembly shall be exposed in a horizontal position centrally located and protected from direct air flow. Repeat the above procedure except cure the assembly for 15 min at 177 +/- 3 C. To insure the proper cure schedule place th
10、e test samples on a 12 x 12 x 0.035 in (300 x 300 x 0.89 mm) CRLC steel panel, before placing in the oven. Cool specimen to 23 +/- 2 C and weigh. Totally immerse the sample in water at 23 +/- 2 C for 22 h. Remove the specimen from the water and lightly blot with high absorbency paper towels as rapid
11、ly as possible. Weigh the specimen, calculate and express the increase in weight as percent water absorption. W3- W2% Water Absorption = - x 100 W2- W1W1 - Weight of aluminum coupon W2 - Weight of coupon and sealer after cure W3 - Weight of coupon and sealer after water immersion 3.7 SAG CHARACTERIS
12、TICS (Oily metal) 3.7.1 At 23 +/- 2 C None Test Method: Apply two 6 x 3/8 x 3/8 in (150 x 9.5 x 9.5 mm) lengths of material (one horizontal and one vertical) to a lightly oiled 12 x 12 in (300 x 300 mm) CRLC steel panel. Use light finger pressure to apply the material. Stand the panel in a vertical
13、attitude for 2 h at 23 +/- 2 C and observe the beads for any displacement from their applied position. ENGINEERING MATERIAL SPECIFICATION ESB-M4G152-B WP 3948-b Page 3 of 5 3.7.2 At 135 +/- 3 C, max 1/2 in (12.7 mm) 3.7.3 At 177 +/- 3 C, max 1/2 in (12.7 mm) Test Method: Carefully form a small quant
14、ity of material into a circular bead approximately 1/4 in (6.4 mm) in diameter x 8 in (200 mm) long. Apply the bead to a lightly oiled 12 x 12 x 0.035 in (300 x 300 x 0.89 mm) CRLC steel panel. Use light finger pressure to apply the material. Feather 1 in (25 mm) of the bead on each end with a putty
15、 knife or similar tool. Condition the assembly for 15 min at 23 +/- 2 C with the panel in a vertical attitude and the bead in a horizontal position. Expose the assemblies in this position to a temperature of 135 +/- 3 C for 15 min. Protect the test assembly from direct air flow through the use of a
16、blank panel located between the air source and the assembly (6 - 12 in (150 -200 mm) apart). Repeat the above procedure, except condition the assembly for 15 min at 177 +/- 3 C. 3.8 ADHESION, min 20 lb (89 N) (100% cohesive failure) Test Method: Apply the material to the face of the standard adhesio
17、n button described in ASTM D 429 (Fig. 1). Place the companion adhesion plate over the adhesive face, inserting the spacer pin to provide 1/8 in (3.2 mm) controlled adhesive mass over the 2.0 in2(12.9 cm2) area. Remove the excess material from the edges of the adhesion fixture with a spatula or othe
18、r suitable means. Air dry not less than 15 min or more than 30 min at 23 +/- 2 C. Cure the assembly in a mechanical convection oven operated at an ambient air temperature of 149 +/- 3 C to achieve a metal temperature of 135 C minimum for 8 - 10 min. The heat energy input (temperature) shall be contr
19、olled by means of a potentiometer (thermocouple) inserted in the material at the face of the standard adhesion button. The total time in the oven at 149 +/- 3 C should not exceed 25 min, although shorter periods of time to reach minimum metal temperature is permissible. The above curing schedule is
20、intended to simulate typical assembly plant oven conditions. Test data shall include verification of test assembly metal temperatures. Cool the specimens to 23 +/- 2 C for 4 h minimum and not more than 24 h. Determine the adhesion in a tensile tester operated at the rate of 1 in (25 mm)/min. (A mini
21、mum of 3 adhesion buttons shall be used to establish the average adhesion value). 3.9 COLD FLEXIBILITY No cracking Test Method: Apply a 6 x 3/8 x 3/8 in (150 x 9.5 x 9.5 mm) length of material to a 3 x 9 in (75 x 225 mm) sheet of aluminum foil using light finger pressure. Cure the material for 15 mi
22、n at 135 +/- 3 C in a mechanical convection oven. Condition the material for 4 h at -29 +/- 1 C and bend 180 around a temperature conditioned 1 in (25 mm) diameter mandrel. Repeat the above procedure, except cure the assembly for 15 min at 177 +/- 3 C. ENGINEERING MATERIAL SPECIFICATION ESB-M4G152-B
23、 WP 3948-b Page 4 of 5 3.10 HARDNESS AFTER CURE, “00“ Durometer 20 - 55 May be determined on specimens prepared for cold adhesion, volume expansion or cold flexibility. Hardness should be measured on a fully expanded specimen no less than 1/8 in (3.2 mm) in thickness. 3.11 RELEASE PAPER Shall be eas
24、ily removable Test Method: Wind a 12 in (300 mm) length of material with release paper into a firm roll. Secure the roll with cellophane or masking tape and condition for 72 h at 43 +/- 1 C. Cool the roll to 23 +/- 2 C and examine for ease of removal by hand peeling the release paper from the sealer
25、 3.12 QUALITY Shall be a smooth, homogeneous mixture free from foreign materials and properties detrimental to normal production operations. 3.13 ODOR Shall be free from objectionable or irritating odors, both as received and after storage. 3.14 TOXICITY The material shall be nontoxic and shall not
26、 cause skin rash or irritation (dermatitis) to exposed handlers in normal production operations. Benzene and chlorinated hydrocarbon solvents are considered toxic and their use is strictly prohibited in compounding material to this specification. 3.15 STORAGE STABILITY Shall be stored at temperature
27、s below 38 C away from all sources of heat. Heat greatly accelerates aging. Under these storage conditions, the minimum shelf life of the material shall be 3 months. When these materials are stored at temperatures below 23 C, they shall be conditioned at room temperature prior to application. Adequa
28、te conditioning permits the material to obtain its maximum application properties. 3.16 SUPPLIERS RESPONSIBILITY Material supplied to this specification must be equivalent to that originally approved. Changes in formulation or processing shall not be made without prior approval as described in Suppl
29、ier Procedure I-A. 4. APPROVAL OF SUPPLIERS: Suppliers to this specification must be approved by the affected product engineering office. Procedure for gaining approval of a specific material to a new/existing ES-M specification is contained in Supplier Procedure I-A. Approved new suppliers will be added to the Engineering Materials Approved Source List. ENGINEERING MATERIAL SPECIFICATION ESB-M4G152-B WP 3948-b Page 5 of 5
