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PDF MMM-A-134 Data sheet ( Hoja de datos )
| Número de pieza | MMM-A-134 | |
| Descripción | Metal to Metal Structural Bonding | |
| Fabricantes | ETC | |
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MMM-A-1:34
..., Auwst 17. 1$)70
SUPERSEDING
MIL-A-8623A
April 12, 1957
FEDERAL SPECIFICATION
ADHESIVE, EPOXY RESIN, METAL TO METAL STRUCTURAL BONDING
‘1’Ms specification was approved by the Commissioner, Federal Supply
Service, Geneml Sertices Administmtiofh for the we of all Fedeml agencies.
1. SCOPE AND CLASSIFICA~ON
1.1 Scope. Thin specification covers epoxy resin adhesives for
structural bondings such as the fabrication and repair of airframe parts, components,
-. id other applications requiring bonding of a similar 0M1M%, (See 6.1)
I
( 1.2 classification. Adhesives covered by this specification shall
“be furnished in the following types as specified (see 6.3):
I Type I - Room tempemture setting (see 3.3.2.1. 1).
Type H- lntermeciiate temperature setting (see 3.3.2.1. 2).
~ ~ - High temperature setting (see 3.3.2. L.3).
2. APPLICABLE DOCUMENTS
2.1 The following apectfications and stan&rds, of the issues in
effect on Me of invitation for bids or request for proposal, form a part of this
specification to the extent specified herein:
Federal Swc Ifications:
c)Q-A-2S0/5 -
Aluminum Alloy, Alclad 2024, Plate and Sheet.
‘IT-I-735
TT-S-735
PPP-B-566
-
-
-
Isopropyl Alcohol .
Standard Test Fluids; Hydrocarbon
khes, Folding, Paperboard.
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MMBf-A-134
L. manufact~re, changes in formulation of the base resin, of qy other chahgm,
shall be cause for designating the adhesive as a new product which shall not be
- considered approved. The changed adhesive S!WU be given a new cmie number
and Bhnll he resubmitted for approval uncle r this tymclflcnt ion. Recommondationa
of the manufacturer for changea in the instruction sheet should be submitted to the
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qualifying activity for approval.
3.2.5.1
Code number. The manufacturer shall designate each qdheoive
by a code number which shall be used to identtfy tb qdtesive. A trade nam, if
accompanied by a co& number, may also be used.
,
3.3 Working characteristics.
3.3.1
Application life. The application life of the adhesives when
mixed and ready for use at 73. 5“ t2” F. (23” tl” C.) shll be s minimum of 1/2
hour for type 1, 2-1/2 hours for type II, and 1 year for ~ XXI. Type 1 ad type xx
adhesives dmIl be considered to have reached the end of their working life wbett
viaoosity reachea 160,000 centlpoiaes (see 4.6.3.2).
3.3.2
Curing time. Unless otlwwise approved by the procuring
actldty, tk curtngtime,- tempemture,
and pressure shall b tit~n tb Mrmititimf
specified kreta.
3.3.2.1
Curing time and tempemture.
3.3.2.1.1
~ L When subjected to a texnpersWre D@ to exceed ltkl” F.
(74- C.) qt the bondbg line, tlm type I adbaive shall cure in 1 hour. At a hn-
peratu~ of 86” ?2” F. (30” *1.1* C.), b cure time ddl not exceed 7
dayB.
3.3.2.1.2
Type 11. A period of two hours maximum at a temperature
not to exceed 210° *o F. (99 “ t] q C.) shall be required tor type 11 adhesive
to harden at the bond line. This shall be foI1owed by a period of 7 days at a tem-
perature of 73.5 q Y2” F. (23 q 21.1 q C!.) to effect complete curing of tk type 11
adhesive.
3.3.2.1.3
Type III. A bond line temperature of 210” F. (99” C.) is
required to harden tbe type Ill adhesive. Mtimum cure ttme for type 111shall be
7 lmurs at a temperature not exceeding 350” F. (177° C.).
3.3.2.2
Curing pressure. The pressure required for curing tbe bonded
test panels &scribed in this specification shall not exceed 10 pounds per square
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MMM-A-134
area of the test ~nels. Faces of ~nels immersed in the same conWner of fluid
shall not contnct each other: panels shall contact the container only at the panel
comers or the %inch edges.
TABLE ~. Fluids for panel imumraion tests
Fluids
Water
Isopropyl alcohol
Hydraulic fluid
specifications
DhNiIled Water
TT-1-735
I
MXL-H-5606
.Swn&rd test fluids
TT-S-73S
Immersion
30 &ya t2 hou .3
7 tiya 22 hours
I
7 &ys 22 hours
(for ~o I and
II adhesives)
7 daya ~2 hams
4.3.7
Accelerated weathering COMWOE8. - h-
bat p~la
shall be exposed to accelerMed weathering for 168 krs in qccordance with method
6152 of Fe& Test MethodStd. No. 141.
4.3.8
All panels to be exposed to the conditions specified in 4.3.5,
4.3. & 4. S. 7 exce@ those spedma dcen from ths ends of ‘k panels for mmtrol-
strength test purposes (4. 5.5. 9) shaIl be immersed as boded (complete, preslotted,
or prepunched) (see 4.4 and figure 1), edges unpm-~d ad prior to being cut into
specimens.
4.4
Preparation of taat pmla and SF=~a~
~~s aa s~= ~
figures 1 through 4 shall be prepared in sufficient quantities (see 4.4. 1), from q given
type of adhesive to futish the necessary number of specimens for all the tes~ a~
plicable to that particular type of adhesive listed in tabie L ~neln for testing types
1, 11, and 111adhesives for all applicable table I properties shall be prepared fmm
0.063-inch clad 2024-T3 aluminum-alloy sheet conforming to QQ-A-250/5. All edges
of the metal panels and specimens which will be witbtn (or whkh wUl bound) the joints
shall be machtned true (without burrs or bevels and at right angles to faces) and
smooth (RHR 140 maximum, in acco~me with USAS B46. 1- 1966) before the panels
are surface treated and bonded. The metal treating and boding procedure employed
sldl be in accordance with the adhesive manufacturer’s instruction sheet. All test
panels shown in figures 1 and 2 shall have an overlap of O. S00 t 0.010 inch except the
figure 2 fatigue test panels, which shall have an overlap of 0.375 ~ 0.010 inch. %nels
so pre~red shall be cut into 1-inch wide specimens for testing in accordance with
the provisions of applicable tests. F%nels shalI not be cut into specimens until at
least 24 hours after bonding. .+luminum-alloy panels may lx sawed with a bandsaw,
with the setting and spacing of teeth and operational speed qdjusted to hold frictional
heating of the bond to a minimum.
4.4.1
Number of panels and specimens required for tests.
11
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