Pyrotrol

Description: Andalusite/Pyrophyllite Ore

Oxide	Analysis	Formula
K2O	0.20%	0.01
Na2O	0.20%	0.02
TiO2	0.40%	0.03
Al2O3	18.90%	1.00
SiO2	77.00%	6.91
Fe2O3	0.40%	0.01
LOI	2.80%	n/a
Oxide Weight		524.03
Formula Weight		539.13

Notes

The Pyrotrol group of mineral products offers a controlled blend of milled Andalusite/Pyrophyllite ores designed for use in whiteware ceramic applications. Pyrotrol reduces thermal expansion, stabilizes shrinkage, widens firing range and reduces warpage.

Alumina content is controlled to meet certain specifications. Pyrotrol produces an excellent kiln car wash and is an inexpensive coating material for facebrick production.

This material is dry-milled and magnetically separated.

The practical differences in grade are mainly particle size, bulk density and small chemistry variations:

2253: Standard fine grade: about 1% retained on 200 mesh, 45 pcf bulk density. Chemistry is about 20.5% Al₂O₃, 75.5% SiO₂, 0.4% Fe₂O₃, 0.4% TiO2.

2254: Similar size and bulk density to 2253, but a slightly different impurity profile: 20.0% Al₂O₃, 75.0% SiO₂, higher Fe₂O₃ at 0.6%, 0.0% TiO2, and “Other” at 4.0% instead of 2.8%.

3503: Chemically essentially the same as 2253, but finer: 100% -200 mesh and noted as 99% -325 mesh. Its bulk density is lower, 40 pcf instead of 45.

All three show PCE 26, so their refractoriness is listed as the same.

For ceramic use, 2253 and 2254 are similar, while 3503 is the finer version. If substituting in a whiteware body to reduce thermal expansion, improve thermal shock/dunting resistance, stabilize shrinkage or widen firing range, the fired effect should be similar, but the finer 3503 may disperse and react more uniformly and could slightly affect plasticity, water demand, drying shrinkage or slip rheology.

Related Information

Links

Materials	Alkatrol
Materials	Andafrac
Materials	Pyrofrac
Materials	Pyrophyl
Materials	Sericite Y/T A commercial grade of sericite mineral.
Materials	Pyrotrol 2253
Materials	Pyrotrol 3503
Materials	Pyrotrol 2254
Typecodes	Aluminum Silicate Materials not classifiable as commonly known aluminum silicates. For example, kaolin is a common aluminum silicate.
URLs	https://www.rescoproducts.com/docs/default-source/data-sheets-us/sds/pyrotrol-all-grades-msds.pdf?sfvrsn=905bb13b_5 SDS for all versions of Pyrotrol
URLs	https://www.rescoproducts.com/docs/default-source/data-sheets-us/pds/pyrotrol-2253-and-2254-and-3503.pdf Pyrotrol Data Sheet

Data

Bulk Density lbs/cu. ft. (Packed)	40-45
Pyrometric Cone Equivalent	26
Sieve Analysis Dry	+200 mesh: 1-3.5% +325: 1-12.5%
Density (Specific Gravity)	2.80

Mechanisms

Body Thermal Expansion	Pyrotrol products impart higher strength in electrical porcelains and reduce dunting problems associated with traditional porcelain bodies if substituted for silica content.

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