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CWN SK Series
Refractory Bricks

Refractory bricks graded to the internationally recognised SK (Seger cone) classification, from SK-32 to SK-38, for international specifications. Every brick is stamped with its grade for traceability on site.

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5Standard grades

34–75%Al₂O₃ range

1600 °CMax service (SK-38)

CWN SK-38 brick showing the stamped grade mark

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Grade explorer

SK gradePCE 36+

CWN SK-36

Low-iron grade with high load-bearing capability for hot-face duty.

Al₂O₃ min47.0%

Max service1400 °C

Bulk density2.15 g/cc

CCS min325 kg/cm²

RUL Ta min1450 °C

Porosity max23%

Typical applicationsReheating furnace walls and roofs, cement preheaters, coke ovens, hot-face linings

Technical data

Properties at a glance

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Property	Unit	CWN SK-32	CWN SK-34	CWN SK-36	CWN SK-38 (A)	CWN SK-38 (B)
Max. service temperature	°C	1200	1300	1400	1600	1600
Refractoriness (PCE)	Orton cone	32+	34+	36+	37+	37+
Al₂O₃	%, min	34.0	42.0	47.0	75.0	70.0
Fe₂O₃	%, max	3.0	3.0	2.25	2.25	2.25
Apparent porosity	%, max	24	23	23	22	22
Bulk density	g/cc, min	2.05	2.15	2.15	2.65	2.60
Cold crushing strength	kg/cm², min	250	310	325	500	500
RUL @ 2 kg/cm² (Ta)	°C, min	1300	1350	1450	1550	1500
PLC test temperature	°C, 2 h	1200	1200	1200	1500	1500
Permanent linear change	%, max	1.0	1.0	1.0	2.0	2.0

Typical specification values. The complete datasheet, sizes, shapes and customer-specific grades are shared on request.

Datasheet on request

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Tell us about your requirement. Our technical team reviews each request and emails the datasheet directly, with a grade recommendation for your application.

01Sent to your business email within one working day

02Grade advice from our technical team

03Sizes, shapes and custom grades quoted on the same thread