37
Connectors
UH-436
UHP MicroTight Union
for 360 µm OD tubing
with fttings and capsule union included
UH-632
UHP MicroTight Union
for 1/32” OD tubing
with fttings included
UH-432
UHP MicroTight
®
Union
for 1/32” OD tubing
with fttings and capsule union included
1.24”
(3.15 cm)
0.37”
(0.94 cm)
1.24”
(3.15 cm)
0.37”
(0.94 cm)
1.25”
(3.18 cm)
0.32”
(0.81 cm)
VHP Unions
Order Online
WWW. IDEX-HS .COM
VHPUnions for Capillary Tubing
Featuring stainless steel bodies and PK/PEEK
™
fttings
Pressure rated up to 15,000 psi (1,034 bar)
Options to direct-connect both 1/32” OD tubing and
360 µm OD tubing
Upchurch Scientifc
®
has expanded its line of specialized fttings and
connectors for UHPLC applications to include several innovative unions
and adapters.
Two of these products— the UH-432 and UH-436— follow the design
of our popular Mini MicroFilters (see page 165) and allow a convenient
union between either 1/32” OD tubing or 360 µm OD tubing. Each
features a stainless steel union body and a unique stainless steel union
capsule, enabling both excellent chemical compatibility as well as
conductivity, making these a great choice for electrical interfacing in
certain LC-MS applications. Each is also coupled with direct-connect
ferrules made fromour proprietary PEEK polymer blend (PK), allowing
tubing connections up to 15,000 psi (1,034 bar). (Please Note: While
these connectors can be used at elevated pressures, they are not
recommended for applications above 100 ºC.)
The UH-632 is a more traditionally designed connector, incorporating
internally threaded ports. The union (UH-632) features a true ZDV
(zero dead volume) connection between both tubes. This unique
product is coupled with our one-piece Ultra-High Performance
Fingertight fttings manufactured from our proprietary PEEK polymer
blend, allowing them to be used in high temperature applications
(up to 200 ºC) at pressures up to 6,000 psi (414 bar) — or use these
connectors at room temperature up to 15,000 psi (1,034 bar)!
Find replacement VHP fttings on page 9
Find Fused Silica tubing on page 65
Find 1/32” OD Stainless Steel tubing on page 68 – 69
To achieve 15,000 psi (1,034 bar) with these fttings, use the
P-278 extender tool found on page 8
Related Products
Part No. Description
Threads
Includes
Thru-hole
Swept Volume Pressure Rating
VHP UNIONS FOR CAPILLARY TUBING
UH-432 MicroTight Union for 1/32” OD Tubing, PEEK/SST
5/16-24 Coned (2) PK-112, (2) P-416
0.006” (0.150 mm) 5 nL
15,000 psi (1,034 bar)
UH-436 MicroTight Union for 360 µm OD Tubing, PEEK/SST
5/16-24 Coned (2) PK-152, (2) P-416BLK
0.006” (0.150 mm) 5 nL
15,000 psi (1,034 bar)
UH-632 MicroTight True ZDV Union for 1/32” OD Tubing, PEEK/SST 6-32 Coned
(2) PK-126, (1) P-553 Gauge Plug N/A
N/A
15,000 psi (1,034 bar)
Top Seller
SEE STARRED PRODUCTS
Application Note
What is a True ZDV Union?
True zero dead volume (ZDV)
unions are designed so that
the two joined pieces of tubing
butt perfectly together as shown
in the image to the right. These
products have no swept volume
contained within the union body.
The fuid moves directly from
one tube into another in this
type of connector.
When using true ZDV unions, it
is important to take care to ensure
connecting tubing has burr-free
90 degree ends. Find tubing
cutters on page 74 to assist with
cleanly cutting polymer and fused
silica tubing. Gauge plugs are
supplied with True ZDV Unions to assist with assembly. With the gauge plug
inserted into one side of the union, a hard stop is created for the tubing to
bottom out against as it is connected to the opposite port. The gauge plug
is removed and then the second piece of tubing is connected, using the
frst piece of tubing to bottom out against resulting in the two tubes joined
together in the center of the union.
Butt Joint
Tubing
Nut
Ferrule
Union
True Zero Dead-Volume
Connection
FOR ORDERING & DISTRIBUTOR INFORMATION +1 800 426 0191 • +1 360 679 2528 • www.idex-hs.com