TD1/TD2/TD3/TD4/TD5/ Needles & Seals (Catalog C12)

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

C12

Phone: 908-788-5550

www.sisweb.com

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 applications 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 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

Seal

Seal

Seals

Temp.

Properties

/pkg

781004 Part #781004—Click for details
Current Price: $9.75
Unit of Measure: EA
Est. Ship Weight=0.05 lbs
Quantity in Stock=73

PTFE

Washers

.21

.12

.06

X

X

X

X

230°C

G

10/pk.

781015 Part #781015—Click for details
Current Price: $14.50
Unit of Measure: EA
Est. Ship Weight=0.01 lbs
Quantity in Stock=580

Graphite Top Sealing Washer

.21

.06

.06

-

X

-

X

450°C

EX

1 ea.

781017 Part #781017—Click for details
Current Price: $11.00
Unit of Measure: EA
Est. Ship Weight=0.01 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Graph. Vesp. Top Sealing Washer .22

.06

.06

-

X

-

X

350°C

G

1 ea.

781018 Part #781018—Click for details
DISCONTINUED
Unit of Measure: EA
Est. Ship Weight=0.01 lbs

Graph. Vesp. Needle Seal Washer .22

.04

.06

-

-

X

X

350°C

G

1 ea.

786017 Part #786017—Click for details
Current Price: $27.00
Unit of Measure: EA
Est. Ship Weight=0.05 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

In 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

desorption 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 samples. For other style needles

please call.

Part No.

Description

786035 Part #786035—Click for details
Current Price: $35.00
Unit of Measure: EA
Est. Ship Weight=0.01 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

AutoDesorb™ Needle, 35 mm

786135 Part #786135—Click for details
Current Price: $39.00
Unit of Measure: EA
Est. Ship Weight=0.01 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

AutoDesorb™ Needle, 35 mm, Silco™

Swagelok Fitting

Connecting Tube

Desorption

Tube

S.S. Needle Cap

781015 Part #781015—Click for details
Current Price: $14.50
Unit of Measure: EA
Est. Ship Weight=0.01 lbs
Quantity in Stock=580

781017 Part #781017—Click for details
Current Price: $11.00
Unit of Measure: EA
Est. Ship Weight=0.01 lbs
Not in stock. Standard lead time for out-of-stock items is approximately two weeks.

Top

Sealing

Washers

Seal

with

Cartridge

Part# 786017 Part #786017—Click for details
Current Price: $27.00
Unit of Measure: EA
Est. Ship Weight=0.05 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.