Shaped Refractories / Andalusite Bricks
A-55 Andalusite Bricks
A-55 is the 55-58% Al₂O₃ grade in Shanker Agencies’ andalusite bricks range, rated for continuous service to 1550°C.
A-55 technical specification
Typical values for A-55 andalusite bricks. Test methods vary by property and product family, so confirm the applicable standard against the manufacturer datasheet before specifying.
Where A-55 is used
Is A-55 right for your application?
- Rated for continuous service up to 1550°C.
- Also meets SK 30, SK 32, SK 34, SK 35 requirements. Those are lower duties, so a lighter grade may be the more economical choice.
Send the drawing, dimensions, application and quantity for A-55 andalusite bricks. Our technical team reviews the requirement and advises on grade and fulfilment route.
Request A-55 QuoteGrade designations & equivalents▾
How A-55 is referenced across Indian and export naming conventions.
| SAPL grade code | A-55 |
| Indian trade names | 55% alumina |
| Export SK equivalentNearest SK step, minimum 55% Al₂O₃ | SK 36 |
| Also meetsExceeds these requirements, a lower grade may suit those duties | SK 30, SK 32, SK 34, SK 35 |
| Alumina content | 55-58% Al₂O₃ |
| Measured refractoriness (PCE)This brick’s own cone value, not its SK trade grade | SK 35 |
| Max service temperature | 1550°C |
Reading an SK code correctly. SK (Seger Kegel) is a cone designation, and each step carries an accepted minimum Al₂O₃ content in trade practice. The dependable way to match an SK enquiry to a grade is that minimum alumina figure, which is how the equivalence above is derived. Note that a brick’s measured PCE and its SK trade grade are two different numbers and will not always agree. Suppliers also differ at the margins, most often around SK 34. When comparing offers, check Al₂O₃ and PCE together rather than the SK code alone.
SK series to andalusite bricks reference▾
Standard SK steps with the SAPL grade that meets or exceeds each one. Grades are matched at or above the minimum alumina for the step, so an SK enquiry is never answered with an under-spec material.
Installation notes
- 1Joint with andalusite or high-alumina mortar of matching grade
- 2Maintain 2–3 mm joints and standard expansion allowance
- 3Controlled dry-out per OEM curve to allow in-situ mullitisation
- 4Excellent choice where bricks must hold dimension through repeated thermal cycles
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.