Manufactured from the highest purity Zirconia, our MAS Rotors provide the NMR spectroscopist with the ultimate alternative for analysis of solid samples; the need to solvate is eliminated. They are available for most present solid state NMR spectrometers.

Wilmad's MAS Rotors are carefully examined for material irregularities by optical methods before and after the precision machining process. Without over-spinning, each rotor is spin tested to only the highest specified spinning speed. Overspin testing, a common practice with some rotor brands, can actually damage the rotor prior to use. High precision (which becomes a necessity for proper spinning performance) is maintained in the manufacture of the end caps*. Most caps are fitted with O-rings for better sealing; some have axial holes for venting.

Advantages of Zirconia Rotors
- Most homogeneous ceramic material structure.
- Wilmad's Zirconia Rotor Body has higher strength (1,000 MPa, greater than Si₃N₄).
- Highest spinning speed (up to 12 kHz for 7mm OD rotors).
- High precision superior finish (0.05 µm mirror gloss).

Some of our caps have a uniquely designed detachable O-ring. Use it when a gas-tight environment is required for the sample. If not, the O-ring can be removed to yield a cleaner background. Without it, the cap will still be tightly fitted into the rotor body.

*Cap and O-Ring Materials:
Registered Trademarks: Viton®, Kel-F®, Macor®, Vespel®, Torlon®

WILMAD MAS Rotor Cap

WILMAD MAS Rotor Body

Properties of Rotor and Cap Materials

Material	Components	Temperature Range (Celsius)	Remarks
Zirconia	ZrO2with MgO	-150 to 650	Excellent chemical resistance.
Kel-F®	F, Cl, C	-20 to 70	Excellent chemical resistance; commonly used for1H studies.
Macor®	Al, Si, O, B, K, F Borosilicate glass ceramic with mica	-150 to 250	Excellent chemical resistance; ideal for13C studies, variable temperature work, air-sensitive and wet samples.
Torlon®	C, N, O, H Poly (amide-imide)	-150 to 200	Not recommended for bases or wet samples; otherwise, excellent chemical resistance. For multi-nuclei studies (except13C) and variable temperature work.
Vespel® SP1	N/A	-150 to 250	For Bruker 2.5 and 4mm rotor

Registered Trademarks: Viton®, Kel-F®, Macor®, Vespel®, Torlon®, Bruker®, Varian®, Doty®

Rotors and Caps for Doty MAS Probe

Product Number	For Doty MAS Probe	Description	Material	Price
WP-501-5135	Standard 5 mm	Rotor Body	Zirconia	$247.96 (A)
WP-601-5135	Standard 5 mm	Rotor Cap	Kel-F	$68.88 (A)
WP-501-5150	High Speed 5 mm	Rotor Body	Zirconia	$247.96 (A)
WP-601-5150	High Speed 5 mm	Rotor Cap	Kel-F	$68.88 (A)
WP-501-7185	Standard 7 mm	Rotor Body	Zirconia	$247.96 (A)
WP-601-7185	Standard 7 mm	Rotor Cap	Kel-F	$68.88 (A)
WP-501-7222	High Speed 7 mm	Rotor Body	Zirconia	$247.96 (A)
WP-601-7222	High Speed 7 mm	Rotor Cap	Kel-F	$68.88 (A)

Rotors and Caps for Bruker MAS Probe(s)

Product Number	For Bruker MAS Probe	Application Temperature	Description	Material	Remarks	Price
WP-501-2180	2.5 mm	-150 to 650 °C	Rotor, open ends. Order bottom plug and cap separately or as a complete set	Zirconia	Vmax =35 kHz	$551.04 (A)
WP-602-2181	2.5 mm	-30 to 70 °C	Rotor Cap	Vespel		$130.87 (A)
WP-602-2182	2.5 mm	-30 to 70 °C	Bottom Plug	Vespel		$117.09 (A)
WP-501-2180-SET1	2.5 mm	-20 to 70 °C	1 2.5mm Rotor, 2 Vespel Caps and Bottoms	Various	Vmax =35 kHz	$964.32 (A)
WP-501-4180	4.0 mm	-150 to 650 °C	Rotor Body	Zirconia	Vmax =18 kHz	$358.17 (A)
WP-501-4181	4.0 mm	-100 to 200 °C	Rotor Body laser marked with a unique serial number and permanent tachometer mark on the base.	Zirconia	Vmax =18 kHz	$385.72 (A)
WP-601-4181	4.0 mm	Ambient	Rotor Cap	Kel-F		$48.21 (A)
JK-601-4181	4.0 mm	-20 to 70 °C	Rotor Cap, Pressfit Style	Kel-F		$75.76 (A)
JK-602-4181	4.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring	Macor		$165.31 (A)
JK-603-4181	4.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring	Torlon		$82.65 (A)
JK-604-4181	4.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring	Vespel		$96.43 (A)
WP-501-4180-02	4.0 mm		Viton O-Ring	Viton	for JK-603-4181/ JK-601-4181	$2.75 (A)
JK-602-4181-O	4.0 mm		Viton O-Ring	Viton	for JK-602-4181	$2.75 (A)
WP-501-4180-SET-1	4.0 mm	-100 to 200 °C	1 Rotor, 2 Kel-F Caps and 1 Torlon Cap	Various	Vmax =18 kHz	$523.48 (A)
WP-501-4180-SET-2	4.0 mm	-100 to 200 °C	2 Rotors, 4 Kel-F Caps and 1 Torlon Cap	Various	Vmax =18 kHz	$1,033.20 (A)
WP-501-4180-SET-5	4.0 mm	-100 to 200 °C	5 Rotors, 10 Kel-F Caps and 3 Torlon Caps	Various	Vmax =18 kHz	$2,410.80 (A)
WP-501-7180	7.0 mm	-150 to 650 °C	Rotor Body	Zirconia	Vmax =8 kHz	$309.96 (A)
WP-601-7180	DB¹ 7.0 mm	-20 to 70 °C	Rotor Cap	Kel-F		$38.57 (A)
WP-601-7181	BL² 7.0 mm	-20 to 70 °C	Rotor Cap, 2 O-Rings	Kel-F		$48.21 (A)
JK-601-7180	DB¹ 7.0 mm	-20 to 70 °C	Rotor Cap, 1 O-Ring	Kel-F		$66.12 (A)
JK-601-7181	BL² 7.0 mm	-20 to 70 °C	Rotor Cap, 1 O-Ring	Kel-F		$68.88 (A)
JK-601-7181-L	BL² 7.0 mm	-20 to 70 °C	Long Rotor Cap, 2 O-Rings	Kel-F		$75.76 (A)
JK-601-7181LWH	BL² 7.0 mm	-20 to 70 °C	Long Rotor Cap, 2 O-Rings and Axial Hole	Kel-F	Minimum 10 piece order	$110.20 (A)
JK-601-7181-WH	BL² 7.0 mm	-20 to 70 °C	Rotor Cap, 1 O-Ring and Axial Hole	Kel-F	Minimum 10 piece order	$104.69 (A)
JK-602-7180	DB¹ 7.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring	Macor		$130.87 (A)
JK-602-7180-L	DB¹ 7.0 mm	-100 to 200 °C	Long Rotor Cap, 2 O-Rings	Macor		$137.76 (A)
JK-602-7181	BL² 7.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring	Macor		$137.76 (A)
JK-602-7181-L	DB¹ 7.0 mm	-100 to 200 °C	Long Rotor Cap, 2 O-Rings	Macor		$151.53 (A)
JK-603-7180	DB¹ 7.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring³	Torlon		$75.76 (A)
JK-603-7180-L	DB¹ 7.0 mm	-100 to 200 °C	Long Rotor Cap, 2 O-Rings³	Torlon		$75.76 (A)
JK-603-7181	BL² 7.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring³	Torlon		$89.54 (A)
JK-603-7181-L	BL² 7.0 mm	-100 to 200 °C	Long Rotor Cap, 2 O-Rings³	Torlon		$75.76 (A)
JK-603-7181LWH	BL² 7.0 mm	-100 to 200 °C	Long Rotor Cap, 2 O-Rings³ and Axial Hole	Torlon	Minimum 10 piece order	$123.98 (A)
JK-603-7181-WH	BL² 7.0 mm	-100 to 200 °C	Rotor Cap, 1 O-Ring³ and Axial Hole	Torlon	Minimum 10 piece order	$123.98 (A)
JK-601-7180-O	7.0 mm		Viton O-Ring	Viton		$2.75 (A)
WP-501-7180-SET-1	7.0 mm	-100 to 200 °C	1 Rotor, 2 Kel-F Caps and 1 Torlon Cap	Various		$523.48 (A)
WP-501-7180-SET-2	7.0 mm	-100 to 200 °C	2 Rotors, 4 Kel-F Caps and 2 Torlon Caps	Various		$895.44 (A)
WP-501-7180-SET-5	7.0 mm	-100 to 200 °C	5 Rotors, 10 Kel-F Caps and 5 Torlon Caps	Various		$2,204.16 (A)

Note 1: DB = Bruker "Double Bearing" style rotor
Note 2: BL = Bruker "Boden Lager" (Bottom Bearing) style rotor
Note 3: O-Rings designed for air-sensitive samples and are detachable; caps will work perfectly with a tight fit to rotor body without them.
Note For Operating End-Caps: No special tools are needed to put in or take out of rotor. They should not be pressed in as this may damage the O-ring. Ensuring the cap shaft and the rotor are aligned, cap should be "screwed" in; when in completely it should be turned back slightly (approximately 1/4 turn). Remove in the same fashion.

Rotors and Caps for Varian Jakobsen MAS Probe

Product Number	For Varian MAS Probe	Application Temperature	Description	Material	Remarks	PrIce
WP-501-5225	5.0 mm	-150 to 650 °C	Rotor Body	Zirconia	Vmax =15 kHz	$516.60 (A)
JK-601-5225	5.0 mm	-20 to 70 °C	Rotor Cap, 2 O-Rings³	Kel-F		$206.64 (A)
JK-603-5225	5.0 mm	-100 to 200 °C	Rotor Cap, 2 O-Rings³	Torlon		$206.64 (A)
JK-603-5225-WH	5.0 mm	-100 to 200 °C	Rotor Cap, 2 O-Rings³ and Axial Hole	Torlon		$234.19 (A)
JK-603-5225-O	5.0 mm		O-Ring for 5mm Caps	Viton		$2.75 (A)
WP-501-7225	7.0 mm	-150 to 650 °C	Rotor Body	Zirconia	Vmax =9 kHz	$482.16 (A)
JK-601-7225	7.0 mm	-20 to 70 °C	Rotor Cap, 2 O-Rings³	Kel-F		$199.75 (A)
JK-603-7225	7.0 mm	-100 to 200 °C	Rotor Cap, 2 O-Rings³	Torlon		$199.75 (A)
JK-603-7225-WH	7.0 mm	-100 to 200 °C	Rotor Cap, 2 O-Rings³ and Axial Hole	Torlon		$220.41 (A)

Registered Trademarks: Viton®, Kel-F®, Macor®, Vespel®, Torlon®

Note 3: O-Rings designed for air-sensitive samples and are detachable; caps will work perfectly with a tight fit to rotor body without them.
Note For Operating End-Caps: No special tools are needed to put in or take out of rotor. They should not be pressed in as this may damage the O-ring. Ensuring the cap shaft and the rotor are aligned, cap should be "screwed" in; when in completely it should be turned back slightly (approximately 1/4 turn). Remove in the same fashion.