MIL-DTL-24688A
6.1.4 Type II, classes 3 and 4. Type II, Classes 3 and 4 materials are intended for use as lightweight thermal
insulation to be applied to round, oval, or rectangular ducts. Type II, Classes 3 and 4 materials are not intended for
use on bulkheads and overheads.
6.1.5 Type II, class 5. Type II, Class 5 material is intended for use as a lightweight thermal insulation to be
applied in spaces where the insulation may be exposed to moisture and/or oil, such as engine rooms and machinery
spaces.
6.1.6 Type III, classes 1 and 2. Type III, Classes 1 and 2 flexible pipe insulation are intended for use on hot
piping operating at temperatures from 100 to 400 °F. Type III, Classes 1 and 2 flexible pipe insulation are not
intended for use on bulkheads and overheads.
6.1.7 Type III, classes 3, 4, 5, and 6. Type III, Classes 3, 4, 5, and 6 rigid pipe insulation are intended for use
on hot piping operating at temperatures from 100 to 600 °F. Type III, Classes 3, 4, 5, and 6 rigid pipe insulation
may be used in areas subject to high traffic. Type III, Classes 3, 4, 5, and 6 rigid pipe insulation are not intended for
use on bulkheads and overheads.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Type and class required (see 1.2).
c.
d.
Nominal pipe size required (see 3.4.2.2).
e.
Thickness of pipe insulation required (see 3.4.2.3).
f.
When painting is required and color desired (see 3.7).
g.
Fire resistance tests on panels and pipe insulation other than as specified (see 3.17).
h.
Toxic gas generation, if other than specified (see 3.18).
i.
j.
Off-gas testing, when required (see 3.24).
k.
Panel identification markings, if other than as specified (see 3.25).
l.
Inspection conditions, if other than specified (see 4.1.1).
m. Lot size, if other than specified (see 4.3.2.1).
n.
When a certificate of compliance is required (see 4.3.3).
o.
Packaging requirements (see 5.1).
p.
Activities requiring copies of completed MSDS (see 6.4).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products
which are, at the time of award of contract, qualified for inclusion in Qualified Products List QPL No. 24688
whether or not such products have actually been so listed by that date. The attention of the contractors is called to
these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the
Federal Government tested for qualification in order that they may be eligible to be awarded contracts or orders for
the products covered by this specification. Information pertaining to qualification of products may be obtained from
Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160,
Washington Navy Yard DC 20376-5160 or emailed to CommandStandards@navy.mil. An online listing of
products qualified to this specification may be found in the Qualified Products Database (QPD) at
6.4 Material safety data sheets (MSDS). Contracting officers will identify those activities requiring copies of
completed Material Safety Data Sheets prepared in accordance with FED-STD-313. In order to obtain the MSDS,
federal acquisition regulation (FAR) clause 52.223-3 must be in the contract.
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