Shaped Refractories / Hot Face Kyanite Insulation Bricks

HFK 135 Hot Face Kyanite Insulation Bricks

HFK 135 is the 30% min Al₂O₃ grade in Shanker Agencies’ hot face kyanite insulation bricks range, rated for continuous service to 1350°C.

Also known as135% alumina

Request HFK 135 Quote Call +91 98999 57888

Grade

HFK 135

Al₂O₃ content

30% min

Max service temperature

1350°C

Cold crushing strength

2.9 MPa min (30 kg/cm²)

Bulk density

1.20 g/cc max

HFK 135 technical specification

Typical values for HFK 135 hot face kyanite insulation bricks. Test methods vary by property and product family, so confirm the applicable standard against the manufacturer datasheet before specifying.

Property	Value
Al₂O₃ content	30% min
Fe₂O₃ content	2.0% max
Bulk density	1.20 g/cc max
Apparent porosity	60% min
Cold crushing strength	2.9 MPa min (30 kg/cm²)
Refractoriness (PCE)	Orton 28
Thermal conductivity	0.35 W/mK max @600°C
Permanent linear change	±1.5% @1350°C/5h
Max service temperature	1350°C

Where HFK 135 is used

Direct hot-face lining in furnaces and kilns operating to 1350°C (HFK 135) or 1400°C (HFK 140)Heat treatment, annealing and tempering furnace liningsKiln car decks and superstructure, where low heat storage cuts fuel per cycleBatch and intermittent furnaces with frequent heat-up / cool-down cyclesSingle-layer wall builds where a separate dense working lining is not justifiedMuffle and laboratory furnace linings

Is HFK 135 right for your application?

Rated for continuous service up to 1350°C.

Compare HFK 135 with other grades▾

Compare HFK 135 against every grade SAPL stocks in this family.

Swipe to compare grades

Grade	Al₂O₃ content	Fe₂O₃ content	Bulk density	Apparent porosity	Cold crushing strength	Refractoriness (PCE)	Thermal conductivity	Permanent linear change	Max service temperature
HFK 135this grade	30% min	2.0% max	1.20 g/cc max	60% min	2.9 MPa min (30 kg/cm²)	Orton 28	0.35 W/mK max @600°C	±1.5% @1350°C/5h	1350°C
HFK 140	37-42%	1.7-2.25%	0.95-1.06 g/cc	60-66%	2.5-3.9 MPa (25-40 kg/cm²)	Orton 28	0.29-0.42 W/mK @500°C	+0.5 to -1.8% @1350°C/5h	1400°C

HFK 140 →

Send the drawing, dimensions, application and quantity for HFK 135 hot face kyanite insulation bricks. Our technical team reviews the requirement and advises on grade and fulfilment route.

Request HFK 135 Quote

Grade designations & equivalents▾

How HFK 135 is referenced across Indian and export naming conventions.

SAPL grade code	HFK 135
Indian trade names	135% alumina
Alumina content	30% min Al₂O₃
Measured refractoriness (PCE)This brick’s own cone value, not its SK trade grade	Orton 28
Max service temperature	1350°C

Installation notes

1Suitable for direct hot-face duty within the grade rating — no separate dense working lining required
2Use matching insulating mortar; a dense mortar joint will conduct heat straight through the wall
3Cut with a hand saw rather than a hammer and chisel; the structure is porous and chips
4Back up with CFI Group 16 where shell temperature needs to come down further

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.