INDUCTION FURNACE COIL COAT & PATCHING MATERIAL
Fused alumina coil grout and patching material for coreless induction furnace linings
PRODUCT OVERVIEW
Coil coat (coil grout) is applied over the induction coil before the working lining is rammed, protecting the coil insulation and conducting heat away from it. Patching material repairs and upgrades worn areas of an alumina-based lining between full relines. Shanker Agencies supplies both the CUMI and Saint-Gobain ranges. From CUMI: SUPER SHIELD, an ultra high temperature coil coating castable rated to 1800°C at 94% Al₂O₃ minimum, and SHIELD, rated to 1700°C at 87–90% Al₂O₃. From Saint-Gobain HeatKing™: CA 337 fused alumina coil coat, which offers significantly higher dielectric strength than silicate-bonded grouts, and PA 748 fused alumina patching material used as a primer or undercoat with alumina-based melting refractories. Choose SUPER SHIELD where peak service temperature governs, SHIELD where fired strength matters (550 kg/cm² after 1450°C), and CA 337 where dielectric protection of the coil is the priority.
KEY PROPERTIES
Base
Fused alumina / high-alumina castable
Dielectric Strength
CA 337 significantly higher than silicate-bonded grouts
Coil Coat Water Demand
CA 337, approx. 10–12% for casting
Patching Water Demand
PA 748, 7.8–10 litres per 25 kg
Shelf Life
CUMI grades and CA 337 nine months; PA 748 one year
Packing
CUMI 25 kg LDPE-lined HDPE; CA 337 25 kg in 1 t jumbo; PA 748 50 kg or 1 MT
APPLICATIONS
TECHNICAL SPECIFICATIONS
Swipe table to see all columns
| Grade | Al₂O₃ | Bulk Density | CCS | Application | Max Temp |
|---|---|---|---|---|---|
| CUMI SUPER SHIELD | 94.0% min | 2.60 g/cc min (dried 110°C) | 200 kg/cm² min (dried 110°C) | Coil coating castable | 1800°C |
| CUMI SHIELD | 87–90% | 2.50 g/cc min (dried 110°C) | 250 kg/cm² min dried; 550 min fired 1450°C | Coil coating castable | 1700°C |
| HeatKing CA 337 | 91.4% | 2.67 g/cm³ (cast & dried) | — | Coil coat / coil grout | 1750°C |
| HeatKing PA 748 | 83% | — | 17 MPa min (fired 1250°C) | Patching / primer / undercoat | 1760°C |
* Typical catalog values. Not independently certified, request a technical datasheet to confirm figures for your application.
AVAILABLE GRADES
INSTALLATION NOTES
- 1
CA 337: mix with approximately 10–12% water and apply as coil grout over the coil before the working lining is rammed
- 2
CA 337: allow the coat to dry fully before ramming the working lining against it
- 3
PA 748: mix 7.8–10 litres of clean water per 25 kg bag, adjusting for water temperature, ambient conditions and required working time
- 4
PA 748: apply to a cleaned, sound surface as a primer or undercoat, then build up the patch
- 5
Both are hygroscopic, store in a cool dry place and keep bags sealed until use
- 6
Follow the manufacturer’s heat-up schedule; do not return the furnace to full power before the patch has dried through
WHY BUY FROM SHANKER AGENCIES
Shanker Agencies is a Saint-Gobain supply partner and dispatches HeatKing CA 337 and PA 748 with the manufacturer’s technical datasheets. Chemistry and physical values shown here are taken directly from the Saint-Gobain product datasheets (CA 337, and PA 748 document HPRG/LAB/MS/0557 rev 02, 30/04/2025), not estimated. Tell us your furnace capacity, coil dimensions and melt chemistry and our engineers will confirm quantities for the coil coat and the patching allowance.
PARTNER BRANDS
QUICK INFORMATION
Max Temperature
1800°C
Category
Unshaped Refractories
Grades Available
4 Standard Grades
Industries Served
Brands We Supply
• CUMI
• Saint-Gobain HeatKing
📦 Quick Delivery
Standard grades in stock, Delhi warehouse. Pan-India delivery in 2–5 days. Same-day dispatch for urgent orders ≤ 2 MT.
MORE IN UNSHAPED REFRACTORIES
Plastic Refractories
Ready-to-use rammable plastic refractory for burner blocks, patching and monolithic linings
Low Cement Castables (LCC)
High-strength castables with 3–5% cement, the industry standard for steel ladles
Ultra Low Cement Castables (ULCC)
Premium monolithics with <1.5% cement for the most demanding high-wear zones
Ramming Mass
Silica, neutral and basic ramming mass for jointless induction furnace linings
READY TO ORDER OR NEED A SAMPLE?
Our engineers can recommend the exact grade for your application. Sample kits available for trials. No minimum order on standard grades.
Available Grades, Coil Coat & Patching Material
Select a grade to see its full specification, designations and equivalents.
- CUMI SUPER SHIELD94.0% min Al₂O₃ · 1800°C
- CUMI SHIELD87–90% Al₂O₃ · 1700°C
- HeatKing CA 33791.4% Al₂O₃ · 1750°C
- HeatKing PA 74883% Al₂O₃ · 1760°C
Also available in this range: CUMI SUPER SHIELD (1800°C), CUMI SHIELD (1700°C), HeatKing CA 337 (Coil Coat), HeatKing PA 748 (Patching). Ask us for the specification on any of these.
Need help selecting a grade? Send us your application, operating temperature, dimensions and specification requirements, and our technical team will review the requirement.
Send your requirement