Shaped Refractories / Fireclay Bricks

HFK-32 Fireclay Bricks

HFK-32 is the 30-34% Al₂O₃ grade in Shanker Agencies’ fireclay bricks range, rated for continuous service to 1300°C. The nearest export designation is SK 32.

Also known asHFK-3232% aluminaSK 32

Also meets SK 30 requirements. Those are lower duties, so a lighter grade may be the more economical choice.

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Grade

HFK-32

Al₂O₃ content

30-34%

Max service temperature

1300°C

Cold crushing strength

28 MPa

HFK-32 technical specification

Typical values for HFK-32 fireclay bricks. Test methods vary by property and product family, so confirm the applicable standard against the manufacturer datasheet before specifying.

Property	HFK-32
Al₂O₃ content	30-34%
Fe₂O₃ content	2.0%
Apparent porosity	22-26%
Cold crushing strength	28 MPa
Max service temperature	1300°C

Grade designations and equivalents

How HFK-32 is referenced across Indian and export naming conventions.

SAPL grade code	HFK-32
Indian trade names	32% alumina
Export SK equivalentNearest SK step, minimum 32% Al₂O₃	SK 32
Also meetsExceeds these requirements, a lower grade may suit those duties	SK 30
Alumina content	30-34% Al₂O₃
Max service temperature	1300°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 fireclay 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.

SK grade	Min Al₂O₃	Cone equivalent	SAPL fireclay bricks
SK 30	30% Al₂O₃	1670°C	HFK-32
SK 32	32% Al₂O₃	1710°C	HFK-32this grade
SK 34	38% Al₂O₃	1750°C	STD-40
SK 35	45% Al₂O₃	1770°C	Enquire
SK 36	55% Al₂O₃	1790°C	Enquire
SK 37	65% Al₂O₃	1820°C	Enquire
SK 38	70% Al₂O₃	1850°C	Enquire
SK 40	82% Al₂O₃	1920°C	Enquire

Where HFK-32 is used

Boiler back walls & settings

General industrial furnace linings

Kiln car superstructures

Waste incinerator linings

Backup linings behind working lining

Soaking pit walls

Full fireclay bricks range

Compare HFK-32 against every grade SAPL stocks in this family.

Grade	Al₂O₃ content	Fe₂O₃ content	Apparent porosity	Cold crushing strength	Max service temperature
STD-30	28-30%	2.5%	22-26%	25 MPa	1300°C
STD-40	38-42%	2.0%	20-24%	35 MPa	1400°C
HFK-28	26-30%	2.5%	24-28%	20 MPa	1250°C
HFK-32	30-34%	2.0%	22-26%	28 MPa	1300°C
HFK-36	34-38%	2.0%	20-24%	32 MPa	1350°C

← HFK-28 HFK-36 →

Installation notes

1Use fireclay mortar of matching composition for jointing
2Keep joint width between 2–4 mm
3Dry-out at 25°C/hr up to 120°C, hold 8 hrs minimum before heating to operating temp
4Suitable for both straight and arch courses, wedge bricks available on request

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.