Molecular Sieve Foreline Traps

Bakeable Molecular Sieve Adsorption Trap

Molecular Sieve Traps are effective for trapping hydrocarbons and water vapor. They are used in between the roughing vacuum pump and diffusion or turbomolecular pump to prevent contamination of the system. Molecular sieve traps utilize synthetic zeolite with a high surface area per unit volume. Pressures below one micron are readily achieved. Traps operate at room temperature, eliminating necessity of refrigerants. A built-in heater reprocesses the sieve material when necessary at a bakeout temperature of 300 degrees C

Molecular sieve traps are fabricated of type 304 stainless steel and are offered with a choice of hose, flange or combination connections.

Bake out is accomplished by connecting the heater leads to 115 VAC power source. Always connect a ground wire to the ground lug for safety. In some cases a three-wire heater with built-in ground wire and grounded twist connector can be used. Heat is self-regulating when connected directly to the power source for 90 minutes. Typically, a timer is used. During bake-out the mechanical pump must be running and should be gas ballasted. During this bake out, pressures in the foreline will rise to more than 10^-1 Torr. Mass 55 peaks (oil vapor) can rise to levels in excess of an untrapped pump on the high vacuum side of the trap during bake-out. Therefore, it is suggested that the MAT trap be valved off from the system during this process. Normal cycle is 90 minutes with Heater on, valves off and a 90 minute cool-down period.

Molecular Sieve Traps will efficiently trap water vapor.

Replacement Charges

RSC sealed charges are pre-baked out and ready to use. Eventually, the sieve charge should be replaced as there is some oil residue that is baked on. Suggested sieve charge replacement is every year or after 10 bake-outs.

Molecular Sieve Absorption Trap Repl. Charge, UOM=EA
Part No.	Body Dimensions	Tubulation	Capacity	Replacement Charge #	ship wt.	Quantity In Stock	Price	Quantity to order
MAT075	4 1/2in OD x5 1/4in	3/4in Pipe- 3/4in pipe	5 CFM	RSC5	5	PART NUMBER OUTDATED. New number is MT75(#)	---	---
MAT100	4 1/2in OD x5 1/4in	1in Pipe- 1in pipe	8 CFM	RSC5	5	PART NUMBER OUTDATED. New number is MT100(#)	---	---
MAT150	4 1/2in OD x7 7/8in	1 1/2in Pipe-1 1/2in pipe	17 CFM	RSC8	5	PART NUMBER OUTDATED. New number is MT150(#)	---	---
MATNW16075	4 1/2in OD x5 1/4in	NW16flange- 3/4in pipe	5 CFM	RSC5	5	0(#)	$278.00
MATNW16	4 1/2in OD x5 1/4in	NW16flange-NW16flange	5 CFM	RSC5	5	PART NUMBER OUTDATED. New number is MT752K(#)	---	---
MATNW25100	4 1/2in OD x5 1/4in	NW25flange-1in pipe	8 CFM	RSC5	5	0(#)	$328.12
MATNW25	4 1/2in OD x5 1/4in	NW25flange-NW25flange	8 CFM	RSC5	5	PART NUMBER OUTDATED. New number is MT1002K(#)	---	---
MATNW40150	4 1/2in OD x7 7/8in	NW40 flange-1 1/2in	17 CFM	RSC8	5	0(#)	$328.12
MATNW40	4 1/2in OD x7 7/8in	NW40flange-NW40flange	17 CFM	RSC8	5	PART NUMBER OUTDATED. New number is MT1502K(#)	---	---
MATCF133075	4 1/2in OD x5 1/4in	1.33in CF flange-3/4in pipe	5 CFM	RSC5	5	0(#)	$283.00
MATCF133	4 1/2in OD x5 1/4in	1.33in CF flange-1.33in CF flange	5 CFM	RSC5	5	PART NUMBER OUTDATED. New number is MT752MS(#)	---	---
MATCF275100	4 1/2in ODx7 7/8in	2.75in CF flange-1in pipe	8 CFM	RSC5	5	0(#)	$300.00
MATCF275150	4 1/2in ODx7 7/8in	2.75in CF flange-1 1/2in pipe	17 CFM	RSC8	5	0(#)	$315.00
MATCF275	4 1/2in ODx7 7/8in	2.75in CF flange-2.75in CF flange	17 CFM	RSC8	5	PART NUMBER OUTDATED. New number is MT1502MS(#)	---	---
(#) Standard lead-time for out-of-stock items is approximately two weeks.
Ordering information. International (non-US) prices available through your local dealer.

Replacement Charges

UOM=EA
Part No.	Description	ship wt.	Quantity In Stock	Price	Quantity to order
RSC5	Molecular Sieve Replacement 1lb 5oz Charge	5	0(#)	$36.00
RSC8	Molecular Sieve Replacement 1lb 12oz Charge	5	0(#)	$42.00
(#) Standard lead-time for out-of-stock items is approximately two weeks.
Ordering information. International (non-US) prices available through your local dealer.

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ADDRESS: Scientific Instrument Services, 1027 Old York Rd., Ringoes, NJ 08551.