Some typical specifications of Indian refractories commonly used in the furnaces and kilns in steel, cement, non-ferrous metals and glass industries are given blow. These are illustrative and do not cover the full range of products and some of the improved items which have been recently developed.

SLIDE GATE REFRACTORIES
	SLIDE PLATES	SLIDE PLATES	NOZZLES	WELL BLOCKS
CHEMICAL PROPERTIES
Al2O3(%) (Min)	88	0	88	90
MgO (%) (Min)	0	95	0	0
SiO 2 (%) (Max)	8	1.5	0	0
Fe2 O3 (%) (Max)	0.2	0	0.2	0
C (%) (Min)	0	0	0	2.0
PHYSICAL PROPERTIES
B.D. (gm/cc) (Min)	2.95	2.85	3.00	2.70
A.P. (Vol. %) (Max)	19	19	20	19
MOR (Kg/cm²) (Min)
at 1400°C	0	0	0	0
at 1500°C	100	100	0	0
Remarks	For Ingot Teeming Ladle	For Continuous Casting Ladle	Nozzles for Slide gate System	Well Blocks for Slide gate System

ZIRCON AND ZIRCON MULLITE BRICKS FOR GLASS INDUSTRIES
	ZIRCON BRICKS		ZIRCON MULLITE BRICKS
CHEMICAL PROPERTIES
Al2O3 (%) (Min)	0		68
ZrO2 (%) (Min)	63		18
PHYSICAL PROPERTIES
A.P. (Vol. %) (Max)	20		21
C.C.S. (Kg/cm² ) (Min)	500		500
RUL (ta°C) (Min)	1600		1600

MULLITE BRICKS FOR GLASS INDUSTRIES
CHEMICAL PROPERTIES
Al 2O3 (%)	70 ± 1
Fe2 O3 (%) (Max)	0.5
PHYSICAL PROPERTIES
Refractoriness (Sk) (Min) at 1800°C	36
B.D. (gm/cc) (Min)	2.55
A.P. (Vol. %) (Max)	18
C.C.S. (Kg/cm² ) (Min)	500
RUL (ta°C) (Min)	1700
PLC (%) (Max) at 1450°C for 2 hrs.	±0.2

CONTINUOUS CASTING REFRACTORIES
	SHROUD	MONOBLOCK STOPPER		SUBENTRY NOZZLE		TUNDISH NOZZLE
CHEMICAL PROPERTIES
C (%)	31.7	22.4	26.8	25.4	18.6	15.8
Al2O3(%)	47.1	58.7	53.7	47.2	0	68.7
SiO 2 (%)	19.4	8.8	9.5	22.3	8.7	8.6
ZrO2(%)	0	0	0	0	69.2	0
PHYSICAL PROPERTIES
A.P. (%)	14.3	12.4	15.7	16.2	17.7	17.2
BD (gm/cc)	2.27	2.53	2.4	2.3	3.27	2.5
MOR (Kg/cm²)	102	122	125	110	95	105
TE (%)  at 900°C	0.25	0.33	0.3	0.3	0.4	0.42
Thermal Spalling Test	3 cycles	1 cycle	3 cycles	0	0	0
1500°C/ Water	No crack	No crack	No crack
Application	Non preheat type High corrosion resistance	Preheat type	Non preheat type	Preheat type	Preheat type High corrosion resistance	Preheat type High corrosion resistance

GAS PURGING REFRACTORIES
	POROUS PLUG	SEATING BLOCK	SLEEVE
CHEMICAL PROPERTIES
Al 2O3 (%) (Min)	88	75	85
Fe2 O3 (%) (Max)	0	2.0	0.5
PHYSICAL PROPERTIES
A.P. (Vol. %) (Max)	20	21	21
B.D. (gm/cc) (Min)	2.8	2.7	2.8
C.C.S. (Kg/cm²) (Min)	900	300	300
Flow rate (Ltrs/Min)  at 2 Kg/cm² (Min)	500	0	0
Application	Directional porosity porous plug for longer purging in LF/VOD ladles	For fixing the porous plug in Ladle bottom	For protection of well block at the time of removal of plug

CERAMIC FIBRE
CHEMICAL PROPERTIES
Al2O3 (%)	32 - 36
SiO 2 (%)	44 - 48
ZrO2(%)	16.5 - 19.5
PHYSICAL PROPERTIES
Classificaiton Temp. (°C)	1425
Colour	White
Tensile Strength 128 Kg/m³ (K Pa)	30.6
Linear Shrinkage (%)
at 1200°C for 24 hrs.	0
at 1400°C for 24 hrs.	<3.5
Specific Heat Capacity (Kj/Kg°K) at 980°C	1.07
Melting Point (°C)	> 1650
Fibre Miameter (m) (Arithmetic Mean)	1.5 - 3.0