Hitemp Ceramics: November 2011

Wednesday, November 30, 2011

Laboratory Ceramic Products

Hitemp Combustion Boats are used in the estimation of carbon in steel samples. The sample of steel drilling is taken in a combustion boat and placed inside a tube furnace maintained at 1300 deg to 1400 deg & oxygen is passed over it which combines with carbon of the steel & CO2 is estimated. Propirties of combustion Boats are High thermal shock resistance, High softening temperature & high resistance to corrosive action to molten steel. Combustion boats are made either by slip casting in plaster of paris moulds or by mechanical pressing.

Combustion Bots Size( mm)

75 x 12 x9

85 x 13 x 9

88 x 13 x 10

95 x 13 x 10

100 x 16 x 12

100 x 18 x 13

COMBUSTION TUBES
Hitemp Combustion tubes are used in the Strohline apparatus for carbon & sulphur estimanition . Combustion boat carriying sample of steel is pushed in this tube .one end of Combustion tube is connected to the strohline appatatus & the other end is connected to the oxygen cylinder through a rubber tubing. Essential Properties of combustion tubes are High thermal shock resistance, High softening temperature & highly impervious.Combustion Tubesare made either by slip casting in plaster of paris moulds or by extrution.

Combustion Tubes Size( mm)	22 x 17 x 500	22 x 17 x 600	22 x 17 x 700	24 x 18 x 500	24 x 18 x 600	24 x 18 x 700
	26 x 20 x 500	26 x 20 x 600	26 x 20 x 700	29 x 22 x 600	29 x 22 x 700	29 x 22 x 750
	32 x 25 x 600	32 x 25 x 700	32 x 25 x 750

MUFFLE TUBE & END CAP Muffle Tube and End Cap

Hitemp Muffle tube is an integral part of combustion furnace used in strohline apparatus. Two end caps are fitted on each side of muffle tube for holding the SIC Heating elements & Combustion tube. There is a centre hole in muffle tube to insert thermocouple. Muffle tubes are made either by slip casting in plaster of paris moulds or by extrution. Where as End caps are made by die pressing. End caps are available with 3 & 4 holes.
LECO CRUCIBLES
Leco Crucibles are used in the estimation of carbon in steel samples. The sample of steel is taken in a leco crucible and placed inside the leco apparatus. Propirties of Leco crucilbles are High thermal shock resistance, High softening temperature & high resistance to corrosive action to molten steel. Leco crucible are made by mechanical pressing.
SILLIMANITE & ALUMINA CRUCIBLES
Sillimanite and Alumina Crucibles

Crucibles are fabricated by slip casting method .They are highly refractory to withstand desired temperatures ,They posses have high thermal shock resistance. These are highly dense to ensure no loss of contents by absorption & are highly resistant to corrosive action of the contents.Used is Laboratories for Chemical Analysis & melting of glass & metals in industries. Alumina crucibles are used for coal analysis & melting rare metals & high melting point alloys. Alumina crucibles are highly resistant to acid & basic slag.

Some Standard Sizes of Crucibles : Grade - 99.5% Al2O3

Cylindrical
OD (mm)	ID (mm)	Height (mm)	Vol (ml)
20	16	30	05
30	26	40	15
35	30	50	30
40	36	60	60
50	44	75	120
65	55	100	240

Conical Short Form
Upper OD (mm)	LowerID (mm)	Height (mm)	Vol (ml)
30	174	24	10
41	18	37	25
48	20	41	40
54	24	50	60
60	26	50	80
66	30	56	100

Conical Tall Form
Upper OD (mm)	Lower ID (mm)	Height (mm)	Vol (ml)
25	15	30	10
30	18	38	15
33	18	40	20
38	21	47	30
42	25	54	45
50	24	65	80
62	32	75	100
73	35	90	150

Thermocouple Tubes, Beads & Sheaths

THERMOCOUPLE SHEATHSTHERMOCOUPLE SHEATHS Hitemp thermocouple sheaths are used as protective covering over sensing elements. So that the elements are protected from the injurious effects of the furnace atmosphere. These thermocouple sheaths are manufactured either by slip casting or by extrution. Vacuum Extruded thermocouple sheaths are dense & highly impervious & give better life compared to conventional slip casted ones . THERMOCOUPLE BEADS Hitemp thermo couple beads are used to provide electrical insulation to the couple which is used for sensing the temperature inside the furnace. These are single, twin , Four hole bore . These are generally used in small lengths of 25mm. However longer lengths are sometime preferred in critical applications.

Laboratory Furnace Parts

Muffles are mainly used in muffle furnaces where heating elements made out of kanthal / Nircrome wires wraped round the muffles generally in the form of coils & inside these muffles objects are kept for heating either for laboratory or industrial purposes. these muffles are made in different Square/ rectangular dimensions . Hitemp Muffels are thin walled for quicker heating. These are rodust in constructions Highly thermal shock resistant. GROOVED REFRACTORIES Grooved refractories are mainly used in High temperature muffle furnaces. The heating coils made out of kanthal / Nircrome wire coils in U Shapes are placed in the groove of the refractories. Higher temperature in these furnaces is achieved as objects are heated directly by radiation . Hitemp Grooved refractories are thin walled & light weight for faster heating . By using Hitemp Grooved refractories peak temperature is attained in almost 1/4th the time as compared to conventional grooved refractories available in the market.These are robust in constructions Highly thermal shock resistant. BUNSEN BURNER CRUCIBLES Hitemp Bunsen burner crucibles are used to support heating element on the outer side of their conical structure & inside provides sufficient space for keeping small samples or test tubes

Laboratory Furnace Parts

Ceramic Furnace Supports

ELEMENT SUPPORTING TUBES/ ROUND MUFFLES Hitemp Element supporting tubes are used for supporting coiled shaped heating elements made out of Kanthal / Nicrome wire used in resistance wire furnace. These tubes have high softening temperature & excellent thermal shock resistance. Hitemp has mastered different compositions to meet out typical air quenching requirements also. These tubes are available in standard diameter with length upto 1500mm. TUBE HOLDING BRICKS/ELEMENT HOLDING BRICKS Tube holding bricks are used to support the element supporting tubes where as element holding bricks carry the elements directly in their grooves. COLLAR TUBES/ COLLAR BUSHES Hitemp Collar Tubes are used for taking out the electrical terminals from the furnace & to help insulate the structure from the electric current , these tubes are not subjected to the peak furnace temperature yet theses must be strong enough & do not get broken. GAS PASSING TUBES Hitemp gas passing tubes are used to carry different gases to maintain atmosphere in the furnace . These are also used to provide stirring in the molten noble metals in addition to the desired inert atmosphere. MULTI HOLE DISC Hitemp Multi hole disc are used in the radiant metallic heaters to insulate elements from the metal tubes. These Disc have high mechanical strength as well as high thermal shock resistance. CUP LOCKS, BOBBINS, WASHERS These are used for holding the ceramic blankets in place. These products have high mechanical strength as well as high thermal shock resistance

Laboratory Ceramic Products

MUFFLE TUBE & END CAP Hitemp Muffle tube is an integral part of combustion furnace used in strohline apparatus. Two end caps are fitted on each side of muffle tube for holding the SIC Heating elements & Combustion tube. There is a centre hole in muffle tube to insert thermocouple. Muffle tubes are made either by slip casting in plaster of paris moulds or by extrution. Where as End caps are made by die pressing. End caps are available with 3 & 4 holes. LECO CRUCIBLES Leco Crucibles are used in the estimation of carbon in steel samples. The sample of steel is taken in a leco crucible and placed inside the leco apparatus. Propirties of Leco crucilbles are High thermal shock resistance, High softening temperature & high resistance to corrosive action to molten steel. Leco crucible are made by mechanical pressing. SILLIMANITE & ALUMINA CRUCIBLES Crucibles are fabricated by slip casting method .They are highly refractory to withstand desired temperatures ,They posses have high thermal shock resistance. These are highly dense to ensure no loss of contents by absorption & are highly resistant to corrosive action of the contents.Used is Laboratories for Chemical Analysis & melting of glass & metals in industries. Alumina crucibles are used for coal analysis & melting rare metals & high melting point alloys. Alumina crucibles are highly resistant to acid & basic slag.

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Wednesday, November 30, 2011

Laboratory Ceramic Products

Some Standard Sizes of Crucibles : Grade - 99.5% Al2O3