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SEMI E137-1104 © SEMI 2004 4 10.2.2 Spruce, fir, or pine , Standar d grade or bette r based on WWPA WL GR, or equival ent-strength softwoods available to the crating lo cation should be used. 10.2.3 Plywood shou ld be  …

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SEMI E137-1104 © SEMI 2004 3
7.3.5 Following final assembly and test, all exposed
surfaces should be thoroughly cleaned with a solution
of 10 to 70% IPA diluted in UPW using wipes and
swabs.
7.3.6 The SME should be inspected thoroughly for
cleanliness.
7.3.6.1 The supplier should provide a copy of their
inspection results (e.g., marked checklist) with the
SME.
8 Triple Wrap Strategy
8.1 The following procedures support the strategy of
totally enclosing and sealing the SME, separate
subassemblies, or support components in three layers of
protective wrapping (see Section 9) so that each layer
forms a protective seal against moisture and particles.
8.2 Each individual wrap layer is intended to be
removed at a specific stage of delivery and relocation
(see Section 16) adhering to the following guidelines.
8.2.1 Inner Wrap — This inner wrap should stay with
the SME, separate subassemblies, and components all
the way into the final cleanroom or a staging area of the
same cleanliness level for wipe down. The wrap should
be cleaned prior to movement into the cleanroom.
8.2.2 Middle Wrap — This middle wrap should stay
with the SME, separate subassemblies, and components
until they reach at least an ISO Class 7 intermediate
staging area. The wrap should be cleaned before
leaving the customer’s loading dock/receiving area and
again before it is removed in the staging area.
8.2.3 Outer Wrap — This wrap is used to protect the
SME, separate subassemblies, and components while in
transit to the loading dock. While the SME, separate
subassemblies, and components are on the customer’s
loading dock/receiving area, the outer shipping
materials should be removed. The wrap should also be
cleaned and removed.
9 Packaging Procedures
9.1 Packaging in Clean Assembly Area — The SME,
separate subassemblies, and components should then be
totally enclosed in a clean polyethylene inner wrap
using tape as required.
9.1.1 A humidity indicator should be included inside of
the initial wrapping layer.
9.1.2 If two sets of pallets are used, the inner pallet
should also meet the requirements of Section 10.2 and
should be enclosed with the SME, separate
subassemblies, and components.
9.1.2.1 The inner pallet should be clearly marked
showing correct lifting points for removal from
shipping container.
9.2 Packaging in Dedicated Clean Packaging Area —
After the inner (i.e., first) wrap is applied, the SME,
separate subassemblies, and components should be
relocated to a dedicated clean (ISO Class 7 or better)
packaging area.
9.2.1 SME, separate subassemblies, and components
should then be totally enclosed in two more
independent layers (i.e., middle and outer wraps) of
clean polyethylene film using tape as required.
9.2.2 After the SME, separate subassemblies, and
components are triple wrapped, they should be placed
on a pallet (see Sections 10 and 11) so that the triple
wrapping is not damaged or violated.
9.2.2.1 The pallet should be movable (with SME,
separate subassemblies, and components attached to it)
with a conventional pallet jack or forklift.
9.2.2.2 The SME, separate subassemblies, and
components should be capable of placement on and
removal from the pallet with a conventional pallet jack
or fork lift without compromising or tearing any of the
triple wrapping.
9.3 After placement on the pallet, the SME, separate
subassemblies, and components should be relocated to a
separate crating area.
10 Crating Procedures
10.1 Design
10.1.1 The maximum outside crating dimensions
should be sized not to exceed the maximum size
requirements for method(s) of shipment (e.g., airfreight,
air-ride trailers).
10.1.1.1 Crating shape and dimensions should be
optimized to obtain transportation cost savings, when
possible.
10.1.2 To ensure crate stability in transit, any crate
over 1.2 m (48 in.) tall should be constructed so that the
narrowest other dimension is no less than half the
crate’s height.
10.2 Crating/Packaging Materials
10.2.1 All wood products used should meet the
regulatory requirements (e.g., heat treated wood
regulations) of the country of delivery and any interim
countries that the SME may be transported through.
SEMI E137-1104 © SEMI 2004 4
10.2.2 Spruce, fir, or pine, Standard grade or better
based on WWPA WLGR, or equivalent-strength
softwoods available to the crating location should be
used.
10.2.3 Plywood should be 3 ply for 1.0 to <1.3 cm
(0.375 to <0.5 in.) in thickness and 5 ply for 1.3 cm
(0.5 in.) in thickness.
10.2.4 Plywood grades should be C-D Exterior, C-D
Plugged, or Sanded Shop-Cutting Panel (“Sanded
Shop”) with exterior glue based on APA The
Engineered Wood Association PS 1.
10.2.4.1 Floating decks may be “Underlayment”
quality, when appropriate.
10.2.5 For SME, separate subassemblies, and
components weighing 2500 kg (5,500 lb), the
following materials should be used:
1 cm (0.375 in.) nominal thickness plywood for
sides and covers,
2.5 × 10 cm (1 × 4 in.) nominal thickness wood for
cleats,
1.3 cm (0.5 in.) nominal thickness plywood for
decking, and
5 cm (2 in.) nominal thickness wood slabs for crate
base.
10.2.6 For SME, separate subassemblies, and
components weighing >2500 kg (5,500 lb), the
following materials should be used:
1.3 cm (0.5 in.) nominal thickness plywood for
sides and covers,
5 × 10 cm (2 × 4 in.) nominal thickness wood for
cleats,
2.5 cm (1 in.) nominal thickness plywood for
decking, and
5 cm (2 in.) nominal thickness wood slabs for crate
base.
10.2.7 The following types and densities of cushion
foam should be used, as required:
Polyurethane foam 19 to 35 kg/m
3
(1.2 to 2.2 lb/ft
3
)
Polyethylene foam 16 to 32 kg/m
3
(1.0 to 2.0 lb/ft
3
)
Polyethylene foam 32 to 64 kg/m
3
(2.0 to 4.0 lb/ft
3
)
Polyethylene foam 64 to 96 kg/m
3
(4.0 to 6.0 lb/ft
3
)
10.2.7.1 Faying (i.e., joining) surfaces of polyethylene
cushion foam used for floating decks should be skived
(i.e., skin removed) to ensure proper bonding.
10.2.8 Barrier bag material should comply with U.S.
MIL-PRF-131 Class 2.
10.2.9 Desiccant (i.e., drying agent) should be
nondusting type, clay or silica gel (e.g., U.S. MIL-D-
3464, Type II, or commercial equivalent).
10.2.10 The following types of cushion wrapping
materials should be used, as required:
Polyethylene foam sheeting, 3 to 6 mm (0.125 to
0.25 in.) nominal thickness
Polyethylene bubble pack cushioning
10.2.10.1 Loose-fill expanded polystyrene (EPS) or
paper products should not be used.
10.2.11 When required due to shipment method (e.g.,
ocean), case line paper should be waterproof paper
laminate (e.g., asphalt or blond laminate) with a
4.9/8.1/4.9 kg/100 m
2
(30/50/30 lb/3000 ft
2
) minimum
basis weight or equivalent.
10.2.12 Strapping material used should be commercial
grade and type determined by SME weight and type.
10.2.13 Tilt indicators used should be low profile,
disposable, and nonresettable.
10.2.14 Shock indicators used should be low profile,
disposable, and nonresettable.
10.2.14.1 The specific shock indicators used should
have an appropriate sensitivity based on the
calculations and recommended ratings of the shock
indicator supplier for the type of crating and SME
sensitivity.
10.2.14.2 Nondisposable (i.e., reusable), battery-
operated, shock-measurement recording equipment may
be used for SME more sensitive to handling, as
required.
10.3 High-temperature and/or low-temperature
indicators used should be disposable and nonresettable.
10.3.1.1 The specific temperature indicator(s) used
should have an appropriate activation point based on
the sensitivity of the SME to temperatures potentially
encountered during shipment or storage.
10.3.1.2 Nondisposable (i.e., reusable), battery-
operated, temperature-measurement recording
equipment may be used for SME more sensitive to
temperature, as required.
10.4 Workmanship
10.4.1 Crates should be free of cracked, damaged, or
broken fasteners.
10.4.2 Nails should not be bent or driven to cause the
wood to split.
SEMI E137-1104 © SEMI 2004 5
10.4.3 Crates should not have exposed nails.
10.4.4 Crates should not have broken or split runners
or skids.
10.4.5 Plywood should be cut square and to fit so that
no edge of the plywood extends >1.6 mm (0.0625 in.)
over or under the panel size, as determined by the cleat
assembly.
10.4.6 The thickness of adjacent boards in a panel
should match within a maximum tolerance of 1.6 mm
(0.0625 in.).
11 Packing and Securing Procedures
11.1 All units of the SME should be adequately
blocked and braced by foam or wood, if necessary to
prevent shifting or movement during handling and
transportation.
11.1.1 SME mainframes and some miscellaneous
components may require special brackets for bracing.
11.2 All heavier items should be placed on the bottom
of the crate with lighter and/or more fragile items
placed near the top of the crate.
11.3 Crates should not be over packed.
11.4 All main SME components should be secured on
a floating base with foam material of sufficient density
to support the weight either in the deck or in the skid.
11.4.1 For SME that is deemed of lower-value and/or
as less-sensitive to handling, a nonfloating base may be
used. However, all other material requirements should
remain the same.
11.5 The foot or base of the SME should be bolted
against the crate’s base, if possible.
11.6 For land and/or air shipment, the SME should be
Wrapped with bubble pack,
Wrapped with polyethylene stretch wrap, and
Placed in a barrier bag.
11.7 For ocean shipment, the SME should be
Wrapped with bubble pack,
Wrapped with polyethylene stretch wrap,
Placed in a barrier bag with activated desiccant
distributed as evenly as possible between barrier
bag and stretch wrap at the rate of 1 g/L (1 oz/ft
3
)
with the SME volume deducted from the air
volume when calculating required amount of
desiccant, up to a maximum of 9.1 kg (320 oz), and
Vacuum sealed in the barrier bag in 5 minutes to
minimize exposure of the desiccant to open air.
11.8 Feet or levelers from any frame or SME
component should not be removed.
11.9 SME on casters (i.e., pivoting rollers) should be
blocked up, keeping the casters clear of the crate, to
prevent damage to casters and to keep them from
wearing through the crate’s base.
11.10 All support hardware or separate components
(e.g., cables, spare parts) should be packaged in
separate containers from the main unit.
12 Monitoring Device Installation Procedures
12.1 Shock indicators should be mounted on both one
end and one side on the outside of the crate at a top
corner.
12.1.1 Shock indicators should be glued to the crate
and coated with lacquer so they cannot be peeled off or
knocked off.
12.2 Additional disposable shock indicators should be
mounted on both one end and one side inside of the
crate at a top corner on the floating base, barrier bag,
packing material, or SME itself for SME more sensitive
to handling, as required.
12.2.1 If shock indicators are mounted inside of the
crate, their locations should be marked on the outside of
the crate.
12.2.2 Nondisposable shock-measurement recording
equipment may be substituted.
12.3 Tilt indicators should be mounted on both the
inside and the outside of the crate.
12.3.1 Tilt indicators on the outside should be glued to
the crate and coated with lacquer so they cannot be
peeled off or knocked off.
12.4 Disposable high-temperature and/or low-
temperature indicators should be placed inside the crate
for SME components sensitive to temperatures
potentially encountered during shipment or storage.
12.4.1 Nondisposable temperature-measurement
recording equipment may be substituted.
13 Marking and Labeling Procedures
13.1 The following markings should be applied to the
crate using vinyl labels or by stencil:
Delicate Instruments
Do Not Drop
Tilt Indicator Information
Shock Indicator Information
Temperature Indicator Information