British-made since 1976

Low scrap, guaranteed

Crucibles to 1,000 kg

Lime stabilised zirconia crucibles to 2,200°C

Trusted with platinum group metals at the highest service temperature in the range. Lime stabilisation prevents volume change, so the body resists spalling and erosion through the severest heating cycles.

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Key benefits

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Highest service temperature

Rated to 2,200°C, the highest in the Magna range, for platinum group metal melting and refining.

Spalling and erosion resistance

Lime stabilisation prevents volume change, so the body resists spalling through the severest thermal cycles.

Volume stability

A stable crystalline structure holds its form where lesser refractories crack or distort.

Clean precious metal

A dense, non-wetting body keeps platinum group metal melts clean during refining.

Lime stabilised zirconia

A lime stabilised zirconia body for the most severe service, where lime stabilisation prevents the volume changes that would otherwise crack the refractory, allowing service to 2,200°C.

Composition: Lime stabilised zirconia
Max service temperature: 2,200°C
Capacity range: 0.5 to 100 kg

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Applications and alloys

The choice of platinum group metal melting and refining, serving to 2,200°C where no other crucible material in the range can.

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Furnaces: Induction and resistance melting
Alloys: Platinum group metals
Above 2,000°C: The highest service temperature in the range

Technical data

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Isopressed round bottomed crucibles

Drg No	ID	OD	IL	OL
862	28	42	70	90
817	32	42	100	110
876	37	48	105	115
630	38	58	107	117
687	42	58	107	117
854	51	67	79	89
607	51	67	140	150
608	63	83	140	154
869	63	80	158	178
638	63	80	178	198
887	63	81	218	238
824	65	89	185	200
691	73	88	190	210
689	75	95	170	190
619	75	87	150	162
628	76	98	159	179
602	76	98	178	198
832	76	96	208	228
651	82	102	121	140
853	82	103	143	163
852	82	106	160	180
649	82	103	185	205
864	91	110	187	210
676	92	111	219	238
898	95	119	215	235
891	95	114	238	255
624	97	119	270	290
613	102	128	254	272
620	108	127	199	210
655	110	125	210	230
605	120	144	229	250
889	125	150	230	255

All dimensions in mm. Drg No: drawing number. ID: inside diameter. OD: outside diameter. IL: inside length. OL: overall length.

Isopressed flat bottomed crucibles

Drg No	ID	OD	IL	OL
683	36	50	68	75
836	38	50	78	86
899	54	70	178	190
878	60	70	105	125
686	72	90	180	200
623	72	90	250	265
874	85	114	183	200
677	95	116	190	220
603	95	120	181	221
604	95	120	241	275
684	95	115	305	330
875	95	115	356	370
1114	100	120	200	220
688	106	125	205	220
873	110	135	205	230
840	127	148	175	200
839	127	148	249	274
660	127	150	247	268
695	127	148	265	289
678	127	153	356	380
639	130	150	268	285
659	136	165	290	315
1105	137	165	329	351
611	140	165	290	315
879	140	170	295	320
851	140	165	317	341

All dimensions in mm. Drg No: drawing number. ID: inside diameter. OD: outside diameter. IL: inside length. OL: overall length.

Chemical analysis

Component	% by weight
SiO2	0.85
TiO2	0.17
Fe2O3	0.07
Al2O3	0.71
CaO	3.99
MgO	0.05
ZrO2 + HfO2	94.00

Typical chemical analysis, percentage by weight.

Physical properties

Property	Value
Apparent Porosity	20%
Bulk Density	4.58 g/cm³

The measurable difference

Every crucible we make is individually inspected before it leaves the works — the same standard we have held for fifty years.

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100%

Individually inspected

50 years

Manufacturing refractories in Britain

1,000 kg

Largest crucible capacity

Recommended backing mix

Browse the backing mixes

Zirconia Backing Mix

Zirconia backing mix shares the crucible's coefficient of thermal expansion, so crucible and packing expand and contract together, reducing thermal stress through the severest cycles.

Specification Stabilised zirconia

Other crucibles

Browse all crucibles

Alumina Crucibles

The workhorse of the range. High purity alumina handles both air and vacuum induction melting, with the thermal shock resistance and smooth, non-wetting surface the investment caster relies on.

Super Zirconia Crucibles

Magnesia stabilised for the most demanding vacuum work. Low thermal expansion means one crucible survives pour after pour of superalloy, the reason aerospace casters specify it.

Chrome Alumina Crucibles

A small addition of chrome oxide gives the alumina body its resistance to slag attack, extending crucible life in the air melting commercial foundry.

Magnesia Crucibles

Lighter than zirconia and preferred by some customers for X-ray analysis. The magnesia body carries lower running costs than stabilised zirconia.

Frequently asked questions

Magna supplies crucibles against drawing numbers or to new dimensions. Send your alloy, furnace type and melt size with an enquiry for a specification.

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What temperature can a lime stabilised zirconia crucible withstand?

Lime stabilised zirconia crucibles serve to 2,200°C — the highest in the Magna range, which is why platinum group metal refiners specify them.

Why is lime stabilisation used?

Which backing mix should be used with zirconia crucibles?

What sizes are lime stabilised zirconia crucibles available in?

Specify the right zirconia crucible

Send the alloy, volume and process you're working with, and our technical team will confirm the drawing number or specify a new size.

Make an Enquiry Call 01242 820009

Reply from a technical specialist within one working day
Drawings and specifications welcome
No obligation

Drg No	ID	OD	IL	OL
862	28	42	70	90
817	32	42	100	110
876	37	48	105	115
630	38	58	107	117
687	42	58	107	117
854	51	67	79	89
607	51	67	140	150
608	63	83	140	154
869	63	80	158	178
638	63	80	178	198
887	63	81	218	238
824	65	89	185	200
691	73	88	190	210
689	75	95	170	190
619	75	87	150	162
628	76	98	159	179
602	76	98	178	198
832	76	96	208	228
651	82	102	121	140
853	82	103	143	163
852	82	106	160	180
649	82	103	185	205
864	91	110	187	210
676	92	111	219	238
898	95	119	215	235
891	95	114	238	255
624	97	119	270	290
613	102	128	254	272
620	108	127	199	210
655	110	125	210	230
605	120	144	229	250
889	125	150	230	255

Drg No	ID	OD	IL	OL
862	28	42	70	90
817	32	42	100	110
876	37	48	105	115
630	38	58	107	117
687	42	58	107	117
854	51	67	79	89
607	51	67	140	150
608	63	83	140	154
869	63	80	158	178
638	63	80	178	198
887	63	81	218	238
824	65	89	185	200
691	73	88	190	210
689	75	95	170	190
619	75	87	150	162
628	76	98	159	179
602	76	98	178	198
832	76	96	208	228
651	82	102	121	140
853	82	103	143	163
852	82	106	160	180
649	82	103	185	205
864	91	110	187	210
676	92	111	219	238
898	95	119	215	235
891	95	114	238	255
624	97	119	270	290
613	102	128	254	272
620	108	127	199	210
655	110	125	210	230
605	120	144	229	250
889	125	150	230	255

Drg No	ID	OD	IL	OL
862	28	42	70	90
817	32	42	100	110
876	37	48	105	115
630	38	58	107	117
687	42	58	107	117
854	51	67	79	89
607	51	67	140	150
608	63	83	140	154
869	63	80	158	178
638	63	80	178	198
887	63	81	218	238
824	65	89	185	200
691	73	88	190	210
689	75	95	170	190
619	75	87	150	162
628	76	98	159	179
602	76	98	178	198
832	76	96	208	228
651	82	102	121	140
853	82	103	143	163
852	82	106	160	180
649	82	103	185	205
864	91	110	187	210
676	92	111	219	238
898	95	119	215	235
891	95	114	238	255
624	97	119	270	290
613	102	128	254	272
620	108	127	199	210
655	110	125	210	230
605	120	144	229	250
889	125	150	230	255