Unshaped Refractories / Conventional Castables

50% Al₂O₃ Castable Conventional Castables

50% Al₂O₃ Castable is the 48-52% Al₂O₃ grade in Shanker Agencies’ conventional castables range, rated for continuous service to 1400°C.

Request 50% Al₂O₃ Castable Quote Call +91 98999 57888

Grade

50% Al₂O₃ Castable

Al₂O₃ content

48-52%

Max service temperature

1400°C

CCS after 110°C dry

25 MPa

Bulk density

2.30 g/cc

50% Al₂O₃ Castable technical specification

Typical values for 50% Al₂O₃ Castable conventional castables. Test methods vary by property and product family, so confirm the applicable standard against the manufacturer datasheet before specifying.

Property	50% Al₂O₃ Castable
Al₂O₃ content	48-52%
Cement content	18-22%
Bulk density	2.30 g/cc
CCS after 110°C dry	25 MPa
CCS after 1200°C	45 MPa
Max service temperature	1400°C

Grade designations and equivalents

How 50% Al₂O₃ Castable is referenced across Indian and export naming conventions.

SAPL grade code	50% Al₂O₃ Castable
Alumina content	48-52% Al₂O₃
Max service temperature	1400°C

Where 50% Al₂O₃ Castable is used

Backup linings behind LCC / dense brick working linings

Boiler furnace front and rear walls (non-hot-face)

Industrial waste incinerator general lining

Heat treatment furnace walls and roof

Soaking pit backup and chimney bottom

Brick-cast hybrid lining where minor repairs and adjustments are needed

Foundry ladle backup and trough lining

Cement preheater bottom and meal chute

Full conventional castables range

Compare 50% Al₂O₃ Castable against every grade SAPL stocks in this family.

Grade	Al₂O₃ content	Cement content	Bulk density	CCS after 110°C dry	CCS after 1200°C	Max service temperature
40% Al₂O₃ Castable	38-42%	20-25%	2.20 g/cc	20 MPa	35 MPa	1300°C
50% Al₂O₃ Castable	48-52%	18-22%	2.30 g/cc	25 MPa	45 MPa	1400°C
60% Al₂O₃ Castable	58-62%	15-20%	2.45 g/cc	30 MPa	60 MPa	1500°C
70% Al₂O₃ Castable	68-72%	15-18%	2.55 g/cc	35 MPa	70 MPa	1550°C
Insulating LD-1.5	45-50%	20-25%	1.50 g/cc	-	-	1300°C

← 40% Al₂O₃ Castable 60% Al₂O₃ Castable →

Installation notes

1Pre-wet steel formwork to prevent cement-water absorption from the castable mix
2Mix with measured water (8–12% by weight) for 4–6 minutes in a pan or paddle mixer
3Cast in 200–250 mm layers and vibrate using a 25 mm needle vibrator for 20–30 seconds per layer
4Cover with polythene sheet for 24 hrs ambient cure before form removal
5Standard dry-out: 25°C/hr to 110°C, hold 8 hrs; then 30°C/hr to operating temperature
6For thin sections (< 100 mm): consider hand-pack or gunning instead of casting

Disclaimer: values are typical and compiled by Shanker Agencies Pvt. Ltd. from standard industry data and published manufacturer specifications. They are indicative, not a guarantee. Confirm the exact grade datasheet before specifying. For a certified datasheet or quotation, contact info@shankeragencies.com or +91 98999 57888.