NOWPAK LINER-BASED CANISTER SYSTEM
7User Manual | Entegris, Inc.
REPLACEMENT BREAKSEALS
Breakseal technology, Figure 7, separates the chemical
from the environment to ensure absolute chemical
integrity during transport of filled canisters. When the
dispense connector is inserted into a canister at the
end user’s site, it punctures the breakseal and allows
access to the chemical stored inside the liner.
Breakseals are single-use only. Each time a chemical
supplier refurbishes a canister, a new breakseal is
inserted into the closure base before capping the
filled canister.
NOTE: All liner-based canister system canisters use a
breakseal, except the 63 mm neck thread type canisters
using the one-piece closure (item part number NC-W2).
These require an ND-LD or ND-HR dispense connector to be
attached directly to the canister after the closure has been
removed. See ND-LD Dispense Connectors on page 9.
This side faces upward
when installed in
the canister.
This side faces downward
in the canister and is
wetted by chemical.
NA-49 standard breakseal
NA-09 standard breakseal
Figure 7. Replacement NA-09 and NA-49 standard breakseals shown.
CANISTER CLOSURES
The chemical supplier uses a closure to seal the canister
after filling it with chemicals. At the end user’s site,
the closure cap is removed by hand and a dispense
connector is installed for drawing chemical from
the canister.
Canister closures are either two-piece assemblies or
one-piece.
Two-Piece Closures
Most canisters are sealed using a two-piece closure,
Figure 8. The closure base is torqued into place onto
the canister, and the closure cap is hand-tightened
onto the base.
The following two-piece closures are available for use
on liner-based canister system canisters, Figure 8:
• NC-03: anodized aluminum, 4- to 40-liter canisters,
2.5-12 UN neck thread, EPDM with PTFE coated
O-ring
• NC-03-2: anodized aluminum, 4- to 40-liter
canisters, 2.5-12 UN neck thread, FEP-encapsulated
O-ring
• NC-04: anodized aluminum, 4- to 40-liter canis-
ters, 63 mm buttress neck thread, EPDM with PTFE
coated O-ring
• NC-04-2: anodized aluminum, 4- to 40-liter canis-
ters, 63 mm buttress neck thread, FEP-encapsu-
lated O-ring
• NC-200-2: anodized aluminum, 200-liter canisters,
4.75-4 buttress neck thread, FEP-encapsulated
bottom O-ring
• NC-200-4: anodized aluminum, 200-liter canisters,
4.75-4 buttress neck thread, EPDM with PTFE
coated bottom O-ring
Each two-piece closure includes a closure base that
contains a compression ring and O-ring, and a closure
cap that contains another O-ring. See Appendix B:
Canister Compatibility Matrix, page 32, for information
on the thread specifications for each type of closure
base and cap.
Cap Closure base
NC-03/NC-04
NC-200-2/NC-200-4
Figure 8. Two-piece anodized aluminum closures.
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