Updated 28 September 2026

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A readable slice of release v1.6.0: five columns out of 24, one row per grade, sorted by family and then by service temperature. The complete table is the CSV in the release - this page exists so you can see the data before downloading it.

Values are as published, not as measured by us. An em dash means the field is empty in every source we have, which is different from a measured zero. Conductivity is quoted at 1 000 °C because that is the temperature most sources report; for insulating grades whose rated limit is below that, the figure is at 400 °C and marked. Read the schema before you lift a number out of this table.

61 of the 412 records in the dataset are flagged `confidence=low`; five of them appear below and are marked in the last column.
Grade	Max service, °C	k @1000 °C, W/(m·K)	Bulk density, g/cm³	Slag index	Family	Record
fireclay 30% Al₂O₃	1350	0.95	2.05	2	fireclay	CC-0012
fireclay 36% Al₂O₃	1400	1.10	2.12	2	fireclay	CC-0014
fireclay, phosphate-bonded plastic	1540	1.45	2.45	2	fireclay	CC-0031
gunning mix, fireclay base	1350	1.00	2.00	2	fireclay	CC-0037
silica brick, 95% SiO₂	1650	1.75	1.85	2	silica	CC-0061
fused silica, slip cast	1700	1.60	1.90	2	silica	CC-0064
high-alumina 50% Al₂O₃	1450	1.35	2.30	3	high-alumina	CC-0088
high-alumina 60% Al₂O₃	1500	1.50	2.40	3	high-alumina	CC-0090
mullite, 72% Al₂O₃	1600	1.70	2.52	3	high-alumina	CC-0097
bauxite-based 85% Al₂O₃	1700	2.00	2.85	3	high-alumina	CC-0103
low-cement castable, 60% Al₂O₃	1500	1.60	2.42	3	high-alumina	CC-0118
dense castable, 90% Al₂O₃	1700	2.40	3.00	4	high-alumina	CC-0121
corundum brick, 99% Al₂O₃	1750	3.00	3.10	4	corundum	CC-0137
fused cast alumina	1800	5.00	3.30	5	corundum	CC-0141
alumina-spinel, 10% MgAl₂O₄	1750	3.50	2.95	4	corundum	CC-0149
nitride-bonded silicon carbide	1600	15.0	2.60	4	silicon-carbide	CC-0166
direct-bonded silicon carbide	1650	20.0	2.72	5	silicon-carbide	CC-0168
SiC castable, 70% SiC	1550	9.5	2.55	4	silicon-carbide	CC-0173
sintered magnesia 97	1700	4.50	2.95	4	magnesia	CC-0191
forsterite brick	1650	2.60	2.70	3	magnesia	CC-0196
dolomite brick, pitch-bonded	1650	3.20	2.80	4	magnesia	CC-0202
magnesia-carbon 10% C	1700	6.80	2.92	5	magnesia-carbon	CC-0211
magnesia-carbon 14% C	1700	8.00	2.95	5	magnesia-carbon	CC-0213
alumina-magnesia-carbon	1700	7.20	3.05	5	magnesia-carbon	CC-0217
magnesia-chrome, rebonded	1700	3.40	3.12	5	chrome-bearing	CC-0233
chrome-corundum	1750	2.60	3.40	5	chrome-bearing	CC-0236
chrome-alumina castable	1650	-	3.05	4	chrome-bearing	CC-0241 low
zirconia, CaO-stabilised	1800	2.00	4.90	4	zirconia-bearing	CC-0258
AZS 33, fused cast	1700	4.50	3.75	5	zirconia-bearing	CC-0261
mullite-zirconia	1700	2.20	2.80	4	zirconia-bearing	CC-0264
zircon brick	1600	2.80	3.60	3	zirconia-bearing	CC-0267 low
graphite block, extruded	2000	85.0	1.75	5	carbon-graphite	CC-0288
carbon ramming paste	1500	10.0	1.55	4	carbon-graphite	CC-0292
semi-graphitic block	1800	35.0	1.68	4	carbon-graphite	CC-0295 low
insulating firebrick, class 23	1260	0.30*	0.55	1	insulating	CC-0311
insulating firebrick, class 26	1430	0.42	0.80	1	insulating	CC-0313
insulating firebrick, class 32	1760	0.65	1.10	1	insulating	CC-0317
lightweight castable, 1.0 g/cm³	1100	0.35*	0.98	1	insulating	CC-0328
ceramic fibre blanket, 1260 class	1200	0.18*	0.128	1	insulating	CC-0334
ceramic fibre board, 1430 class	1400	0.22	0.32	1	insulating	CC-0337 low
calcium silicate board	1000	0.10*	0.25	1	insulating	CC-0341
microporous panel	1000	0.03*	-	1	insulating	CC-0344 low

* conductivity quoted at 400 °C, the grade is not rated for 1 000 °C in continuous service.

Reading the columns

Max service, °C - the continuous limit quoted by the source for an oxidising atmosphere unless the record says otherwise. Carbon-bearing grades carry a second, much lower limit for air that lives in max_service_atmosphere and its note field.
k @1000 °C - thermal conductivity. Three measurement methods appear across the dataset and they do not agree with each other to better than about 15%, so k_method travels with every value.
Bulk density - dry, as fired or as cured. Castables are quoted after the drying schedule in the source, which is why two otherwise identical castables can differ by 0.1 g/cm³.
Slag index - an ordinal 1 to 5 assigned by this project, where 1 means no useful resistance and 5 means it is routinely used in direct slag contact. It is a reading aid, not a measurement.
Record - the stable id. Ids are never reused, even after a record is withdrawn.

Filtering properly

This page has no search box on purpose: a static table that pretends to filter in the browser would quietly hide rows and nobody would notice. Query the release files instead.

# every grade usable above 1700 C with conductivity under 3 W/(m K)
$ cinderq filter --min-temp 1700 --where 'k_1000_w_mk<3' --format table

# the full insulating family as CSV, including the empty cells
$ cinderq filter --family insulating --format csv --include-nulls > insulating.csv

Both forms are documented on the tool page, and --explain will print the source id behind each value if you need to chase a number back to its document.