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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

Request the SK Series technical datasheet

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