SIS Catalog Online

TD1/TD2/TD3/TD4/TD5 Needles and Seals

C14

Scientific Instrument Services, Inc.

™

Phone: 908-788-5550

www.sisweb.com/catalog/08/C14

Seals for Desorption Tubes

Seals are utilized in a variety of locations in the Short Path Thermal Desorption Unit.

Graphite seals are physically soft but have excellent sealing properties and temperature limits and are recommended for most appli-

cations with the Desorption System. The graphite seals have good sealing properties when tightened finger tight, have a fairly good life,
and provide for the highest temperature without contamination of the system by foreign matter.

PTFE seals have temperature limitations like the Viton™ seals, but are good general seals for lower temperature applications. They

have good sealing characteristics, good abrasion resistance, and are usable to about 230°C. At temperatures above this they tend to flow
and then are quite difficult to remove from the fittings.

Graphitized Vespel

™

seals contain 40% graphite and physically are harder than graphite seals but with lower temperature limits. They

require slightly more force to form a good seal in the Desorption Unit. Normally about 1/16 turn past finger tight will form a good seal.
Since these seals are harder than graphite, they hold their shape better, have a longer life, and are easily removable.

Seals for the Desorption Tubes

(Dimensions inches)

Cap

Top

Needle Accessory

Max.

Sealing

Units

Part No.

Type

O.D.

I.D.

Thick

Seal

Seals

Temp.

Properties

/ pkg

/pkg

781004 Part #781004--Click to order
Current Price: $9.24
Unit of Measure: PK
Est. Ship Weight=0.25 lbs
Quantity in Stock=34

PTFE Washer .21

.12

.06

X

230°C

G

10/pk.

781015 Part #781015--Click to order
Current Price: $13.50
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=322

Graphite Top Sealing Washer

.21

.06

-

X

-

X

450°C

EX

1 ea.

781016 Part #781016--Click to request quote
Obsolete part number. New number is 781018 Part #781018--Click to order
Current Price: $10.50
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=4982
. Please call for ordering (1-908-788-5550).
Unit of Measure: EA
Est. Ship Weight=0.25 lbs

Graphite Needle Washer

.21

.04

.06

X

-

X

-

450°C

EX

1 ea.

781017 Part #781017--Click to order
Current Price: $10.50
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=7804

Grap Vesp Top Sealing Washer

.22

.06

-

X

-

X

350°C

G

1 ea.

781018 Part #781018--Click to order
Current Price: $10.50
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=4982

Grap Vesp Needle Seal Washer .22

.04

.06

-

X

350°C

G

1 ea.

786017 Part #786017--Click to order
Current Price: $24.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Vespel Seal with Cartridge (TD5)

1 ea.

Desorption Tube & Connector Assembly for TD1-TD4

Connecting Tube and Needle Assembly for TD5

Needles for the Desorption Tubes

I

n the Short Path

™

Thermal Desorption System, the needle serves as the transfer line for the introduction of the sample into the Gas

Chromatograph. This “short path” for sample transmission is the key advantage of the Short Path Thermal Desorption technology
which minimizes sample decomposition, eliminates system contamination and provides for the maximum delivery of samples to

the GC.

This 2 piece needle has been specifically designed for the AutoDesorb

™

system and is now used for all models of the Thermal

Desorption System replacing the previous design. The new design will permit the sealing of the needles and connecting tube to the des-
orption tube with just a finger tight twist connection. Vespel

™

seals (sold separately) are used to make the leak tight seal. Double seals

are not needed with this system. The needles are of the side port design to eliminate coring of the GC septa and are 35 mm long. The
needles are available in plain stainless steel and now also in Silco

™

coated steel to eliminate any metal surface in contact with your sam-

ples.

For other style needles please call.

Part No.

Description

786035 Part #786035--Click to order
Current Price: $33.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=20

AutoDesorb™ Needle, 35 mm

786135 Part #786135--Click to order
Current Price: $37.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=1

AutoDesorb™ Needle, 35 mm, Silco

™

Swagelok Fitting

Connecting Tube

GLT
Desorption
Tube

S.S. Needle Cap

781015 Part #781015--Click to order
Current Price: $13.50
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=322
781017 Part #781017--Click to order
Current Price: $10.50
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Quantity in Stock=7804

Top
Sealing
Washers

Seal
with

Cartridge

Part# 786017 Part #786017--Click to order
Current Price: $24.00
Unit of Measure: EA
Est. Ship Weight=0.25 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Desorption

Tube

Vespel Seal

Part# 786018

Desorption

Tube Needle

2 Piece Desorption Tube Needle and Cross Section

Showing placement of the needle and seal.

Related information may be found on the following pages of our web site:

Page	Parts
Thermal Desorption Conditioning Oven - 6 Tube	781015
Wheaton Purge and Trap System	781004
Thermaa Desorption Sample Loader	781004
Short Path Thermal Desorption GLT Tubes	781004
Purge and Trap Stainless Steel Purge Heads	781004
Needles for the Short Path Thermal Desorption System	781054, 786035
24 Tube Conditioning Oven for Thermal Desorption Tubes - C14	781015
Seals for SIS Thermal Desorption Tubes	781004, 781015, 781016, 781017, 781018

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