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METRIC

MIL-PRF-32662A

w/AMENDMENT 1

12 January 2023

SUPERSEDING

MIL-PRF-32662A

22 August 2022

PERFORMANCE SPECIFICATION

ADHESIVE, HIGH-LOADING RATE, FOR STRUCTURAL AND ARMOR APPLICATIONS

1. SCOPE

1.1 Scope. This specification covers high-loading rate adhesives that are purposed for

structural and armor applications. Examples include composite armor systems and other up-

armoring or applique’ systems.

1.2 Classification. Adhesives bonding systems are classified based on room temperature

single-lap-joint performance under the following groups.

1.2.1 Group I. Group I adhesives are categorized as having a maximum strength (S

max

)

greater

than or equal to 10.0 MPa (1450 psi) and a minimum complete failure displacement limit (d

failure

)

greater than 3.81 mm (0.15 in); (e.g., d

failure

> 3.81 mm [0.15 in] and S

max

≥ 10.0 MPa [1450 psi]).

1.2.2 Group II. Group II adhesives are categorized as also having a maximum strength greater

than or equal to 10.0 MPa (1450 psi), yet their complete failure displacement limits fall between

the range of greater than or equal to 1.60 mm (0.063 in) and less than or equal to 3.81 mm (0.15

in); (e.g., 1.60 mm [0.063 in] ≤ d

failure

≤ 3.81 mm [0.15 in] and S

max

≥ 10.0 MPa [1450 psi]).

Comments, suggestions, or questions on this document should be addressed to Director, U.S.

Army DEVCOM Research Laboratory, Army Research Directorate, Specifications and

Standards Office, ATTN: FCDD-RLA-MC, Aberdeen Proving Ground, MD 21005-5069.

Since contact information may change, you may want to verify the currency of this address

information using the ASSIST Online database at https://assist.dla.mil/.

AMSC N/A FSC 8040

DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.

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MIL-PRF-32662A w/AMENDMENT 1

1.2.3 Group III. Group III adhesives are categorized with a maximum strength greater than or

equal to 10.0 MPa (1450 psi) but producing complete failures at a displacement less than 1.60 mm

(0.063 in); (e.g., d

failure

< 1.60 mm [0.063 in], S

max

≥ 10.0 MPa [1450 psi]).

1.2.4 Group IV. Group IV adhesives are categorized as having a maximum strength less than

10.0 MPa (1450 psi) regardless of the amount of displacement at complete failure.

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this

specification. This section does not include documents cited in other sections of this specification

or recommended for additional information or as examples. While every effort has been made to

ensure the completeness of this list, document users are cautioned that they must meet all specified

requirements of documents cited in sections 3 and 4 of this specification, whether or not they are

listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and

handbooks form a part of this document to the extent specified herein. Unless otherwise specified,

the issues of these documents are those cited in the solicitation or contract.

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-DTL-48611 - Adhesive System, Epoxy-Elastomeric, for Glass to

Metal.

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-810 - Environmental Engineering Considerations and

Laboratory Tests.

MIL-STD-3059 - Acceptance Criteria for Adhesives for High-

Loading Rate Applications

(Copies of these documents are available online at https://quicksearch.dla.mil/.)

2.2.2 Other Government documents, drawings, and publications. The following other

Government documents, drawings, and publications form a part of this document to the extent

specified herein. Unless otherwise specified, the issues of these documents are those cited in the

solicitation or contract.

ARMY REGULATIONS

Army Regulation (AR) 25-400-2 - The Army Records Information System (ARIMS)

(Copies of these documents are available online at:

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MIL-PRF-32662A w/AMENDMENT 1

SAE INTERNATIONAL STANDARDS

SAE AMS 3695 - Adhesive Film, Epoxy Base, For High

Durability Structural Adhesive

SAE AMS 4035 - Aluminum Alloy Plate & Sheet (2024)

SAE J243 - Methods of Tests for Automotive-Type

Sealers, Adhesives, and Deadeners

SAE J1524 - Method of Viscosity Test for Automotive

Type Adhesives, Sealers, and Deadeners

(Copies of these documents are available online at https://www.sae.org/.)

2.4 Order of precedence. In the event of a conflict between the text of this document and the

references cited herein, the text of this document takes precedence. Nothing in this document,

however, supersedes applicable laws and regulations unless a specific exemption has been

obtained.

3. REQUIREMENTS

3.1 Approval. Adhesives qualified under this specification shall be products that have been

tested and have passed the approval tests specified herein evidenced by supporting OQE (6.4).

3.2 Materials.

3.2.1 Adhesive. The adhesive shall be a thermosetting resin.

3.3 Bond Strength (Groups I, II, III and IV). The bond strengths for the Groups I, II, III and

IV adhesive bonding systems shall be as specified in tables I - IV, as determined per guidance

provided in MIL-STD-3059. Average bond strengths shall be measured from a minimum of 5

specimens for each testing condition.

TABLE I. Tier I bond strength, failure extension, and crack extension requirements.

1/,2/

Tier I Sample

Conditioning

Tier I Test

Temperature

Adhesive

Classification

Minimum Avg.

Strength

Minimum Avg. Failure

Displacement

Ambient room

temperature, dry

23° ± 2°C

(73 °F, +/–3 °F)

Group I

≥ 10.0 MPa

(1450 psi)

> 3.81 mm (0.15 in)

Group II

≥ 10.0 MPa

(1450 psi)

≤ 3.81 mm (0.15 in)

≥ 1.60 mm (0.063 in)

Group III

≥ 10.0 MPa

(1450 psi)

< 1.60 mm (0.063 in)

Group IV

< 10.0 MPa

(1450 psi)

Not Applicable

Averages shall be measured from a minimum of 5 specimens for each testing condition.

Tier I single-lap-joint strength and failure displacement requirements (see 4.5.4.1).

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MIL-PRF-32662A w/AMENDMENT 1

TABLE II. Tier II bond strength, failure extension, and crack extension requirements.

1/,2/

Tier II Sample Conditioning

Tier II Test

Temperature

Adhesive

Classification

Minimum Avg. Strength Retention

Water immersion for 14 days

at a temperature of 63 °C,+/–3

°C

(145 °F, +/–5 °F)

23° ± 2°C

(73 °F, +/–3 °F)

Group I

75% of initial dry maximum strength

measured in first tier testing, no

requirements for failure displacement

Group II

Group III

Group IV

Averages shall be measured from a minimum of 5 specimens for each testing condition.

Tier II single-lap-joint strength and failure displacement requirements (see 4.5.4.2).

TABLE III. Tier II, part 2 bond strength, failure extension, and crack extension requirements.

1/,2/

Tier II – Part 2 Sample

Conditioning

Tier II- Part 2

Test Temp.

Adhesive

Classification

Minimum Avg. Strength Retention

Ambient room temperature,

dry

71 °C, +/–3°C

(160 °F, +/–5

°F)

Group I

50% of initial dry maximum strength

measured in first tier testing, no

requirements for failure displacement

Group II

Group III

Group IV

Averages shall be measured from a minimum of 5 specimens for each testing condition.

Tier II, part 2 single-lap-joint strength and failure displacement requirements (see 4.5.4.3).

TABLE IV. Tier III bond strength, failure extension, and crack extension requirements.

1/,2/

Tier III Sample and Test Conditioning

Adhesive

Classification

Minimum Avg. G

ISCC

60 °C, +/–1.1 °C, (140 °F, +/–2 °F) and 100% relative

humidity (RH) for 5 weeks

Group I

0.61 KJ/m

(3.5 in-lb/in

)

Group II

Group III

Group IV

Not Applicable

Averages shall be measured from a minimum of 5 specimens for each testing condition.

Tier III Crack extension test requirements (see 4.5.4.4).

ISCC

- Mode I tensile strain energy release rate while undergoing stress corrosion cracking.

3.4 Storage life. The Group I, Group II, Group III, and Group IV adhesive bonding systems

shall meet the bond strength requirements of tests for Tier I, II, and III of tables I - IV, if applicable,

after storage for 6 months at a temperature not to exceed 30° ± 2°C in the absence of sunlight.

Storage stability shall also be maintained at an elevated temperature of 40° ± 2°C for two weeks

(14 days).

3.5 Product characteristics.

3.5.1 Adhesive component.

3.5.1.1 Viscosity. 80 to 2500 Pa-s as measured with a rotational (Brookfield®) method. The

adhesive should be hand trowelable or extrudable from cartridge containers using a hand-operated

or pneumatic static mixing gun.

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