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Unshaped Refractories / Conventional Castables

Insulating LD-1.5 Conventional Castables

Insulating LD-1.5 is the 45-50% Al₂O₃ grade in Shanker Agencies’ conventional castables range, rated for continuous service to 1300°C.

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Insulating LD-1.5 grade conventional castables supplied by Shanker Agencies
Grade
Insulating LD-1.5
Al₂O₃ content
45-50%
Max service temperature
1300°C
Cold crushing strength
6 MPa
Bulk density
1.50 g/cc

Insulating LD-1.5 technical specification

Typical values for Insulating LD-1.5 conventional castables. Test methods vary by property and product family, so confirm the applicable standard against the manufacturer datasheet before specifying.

PropertyInsulating LD-1.5
Al₂O₃ content45-50%
Cement content20-25%
Bulk density1.50 g/cc
Cold crushing strength6 MPa
Thermal conductivity0.40 W/mK
Max service temperature1300°C

Grade designations and equivalents

How Insulating LD-1.5 is referenced across Indian and export naming conventions.

SAPL grade codeInsulating LD-1.5
Alumina content45-50% Al₂O₃
Max service temperature1300°C

Where Insulating LD-1.5 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 Insulating LD-1.5 against every grade SAPL stocks in this family.

GradeAl₂O₃ contentCement contentBulk densityCold crushing strengthThermal conductivityMax service temperature
40% Al₂O₃ Castable38-42%20-25%2.20 g/cc--1300°C
50% Al₂O₃ Castable48-52%18-22%2.30 g/cc--1400°C
60% Al₂O₃ Castable58-62%15-20%2.45 g/cc--1500°C
70% Al₂O₃ Castable68-72%15-18%2.55 g/cc--1550°C
Insulating LD-1.545-50%20-25%1.50 g/cc6 MPa0.40 W/mK1300°C
← 70% Al₂O₃ Castable

Installation notes

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