Refractory Cement CA70

KERUI produces high purity Calcium Aluminate Cements with 70,75 and 80% Al2O3 content by sintering process.
These products not only widely used throughout the refractory industry, but also in other areas such as building chemistry materials are in high demand. 

【Description】

High purity calcium aluminate cement CA70 contain only calcium aluminates.
The high calcium aluminate content provides characteristics ideally suited for refractory applications where rapid hardening combined with excellent mechanical resistance and high temperature performance are required. So they are widely recommended for high performance refractories such as low cement, ultra low cement castables.

The 70%alumina cements of KERUI are represented by three product types，CA70，CA70W and CA70S.

” CA70 and CA70W do not contain any additives and a -Al2O3. “

CA70 has moderate setting time and hardening properties, so it shows outstanding additives compatibility and tolerance to dosage rates in all types of deflocculated systems ensuring flexibility for optimized formulations. Its use is recommended for high performance refractories such as low cement, ultra low cement, self-flow castables and wet shotcrete products.And its rheological properties are well adapted for all types of placing methods, particularly for casting and gunning.

CA70W has short setting times and higher early strength, so it is suitable to be used in low temperature environment especially in wintertime and other urgent occasion such as rapid installation or emergency maintenance etc.

CA70S, a specially formulated calcium aluminate cement, has good fluidity and long workable time; the castables made by this product showing good working ability and excellent mechanical strength, and it suits very well to be applied in high temperature environments or hot summer time.

Notes: refractory cement = high alumina cement = Calcium aluminate cement

Series	CA70	CA70	CA70W	CA70W	CA70S	CA70S
Workable time	Moderate	Moderate	Short	Short	Longer	Longer
Standard	Usual range	Specification limit	Usual range	Specification limit	Usual range	Specification limit
SiO2, %	0.2-0.7	≤1.0	0.2-0.7	≤1.0	0.2-0.7	≤1.0
Al2O3, %	68.5-70.5	≥68	68.5-70.50.	≥68	68.5-70.5	≥68
Fe2O3, %	0.1-0.5	≤0.7	1-0.5	≤0.7	0.1-0.5	≤0.7
CaO, %	28.5- 29.5	-	28.5-29.5	-	28.5-29.5	-
R2O, %	-	≤0.4	-	≤0.4	-	≤0.4
S-, %	-	≤0.1	-	≤0.1	-	≤0.1
CI-, %	-	≤0.06	-	≤0.06	-	≤0.06
d50(μm)	44149	≤14	44022	≤10	44149	≤14
325M(%)	-	≤8.0	-	≤5.0	-	≤8.0
Specific surface areas, ㎡/kg	380-420	≥350	400-450	≥400	380-420	≥350
Setting time, min
Initial setting time IS	180-240	≥150	60-120	≥30	240-270	≥180
Final setting time FS	240-300	≤360	120-180	≤240	300-360	≤360
Flexural strength, Mpa
1d	9.0-11.0	≥5.0	9.0-11.0	≥5.0	8.0-11.0	≥5.0
3d	11.0-12.0	≥6.0	11.0-12.0	≥6.0	11.0-12.0	≥6.0
Compressive strength, Mpa
1d	45-55	≥30	45-55	≥30	45-55	≥30
3d	55-65	≥40	55-65	≥40	60-70	≥40

【Additional Information】

Principal phase: CA, CA2

Secondary phase: C12A7, Aα

Pyrometric cone equivalent: 1580-1620℃

Bulk density: 850-950 kg/m³

Specific gravity: 2.9-3.1 g/cm³

Shelf Life: 6 months

【Packaging and Storage】

Packing method: Standard export packaging

Paper bags: 25/50kg

Big bags: 1.0/1.5mt

Storage tips: High purity calcium aluminate cements must be stored in dry conditions, off the ground. In this case, it will retain its proper ties for at least 6 months. In many instances, experience has demonstrated that properties are retained for more than one year.