Alumina 99.7% Labware and Tubes

  1. 99.7% Alumina Labwares are made from special grade of Alumina imported from ALCOA Germany.
  2. These Labware are made by slip casting and pressure casting. Special care is taken to maintain purity of sintered Alumina to be above 99.7%
  3. Sintered Grain Size is between 2-4 microns.
  4. Tolerance: +/- 1mm for all dimensions up to 50 mm. +/- 2mm for all dimensions above 50 mm.
  5. Typical Chemical Composition of ALCOA Powder (Sintered Product) by wt %
    Al2O3 [%] 99.8 (99.7)    SiO2 [%] 0.015 (0.05)          MgO [%] 0.04 (0.08)
    Na2O [%] 0.03 (0.03)     Fe2O3 [%] 0.015 (0.015)    CaO [%] 0.01 (0.03)
    All data are based upon Ants standard test methods. The typical values are based upon actual averages from production data.
  6. Sintered Density: above 3.9 gm/cc, above 98% TD (3.96gm/cc)
  7. Lustre and Color: With submicron Alumina powder from ALCOA, Ants create special Vitreous Lustre, Ivory Color and a Translucent high purity Alumina Labware.
  8. Solubility in boiling HF: 0.1 % by wt after three hours. Solubility in boiling HCL, H2SO4 and NAOH after 12 hours: less than10-3% by wt.
  9. Thermal Shock Behavior: Temperature change rate should not exceed 150°C/Hr
  10. Maximum Temperature of use without load: 1750°C
  11. Components of Alumina 99.7% made by Ants have been tested with success for Ultra High Vacuum Compatibility.
  12. Although Alumina 99.7 does not react with most acids, chemicals and reagents, it does form Low temperature eutectic with compounds of Bismuth, Lead, Silicon, Tin, Antimony and rare earths. So care has to be taken to not use Alumina wares for heat treatment of one eutectic forming compound with another eutectic forming compound.

Recommended Usage:
Ants 99.7% Alumina wares are especially useful to chemists, metallurgists, and others high temperature involved in work demanding contamination-free results. These wares are highly refractory, meant for use in reducing and oxidizing atmospheres. It is inert in hydrogen and carbonaceous atmospheres and offers high resistance to alkalies and other fluxes. Suitable for glass melting, including borosilicate glass.

Physical Properties

Units of Measure Value
Density gm/cc > 3.85
Porosity % < 0.5
Flexural Strength MPa 379
Elastic Modulus GPa 375
Shear Modulus GPa 152
Bulk Modulus GPa 228
Poisson's Ratio -- 0.22
Compressive Strength MPa 2600
Tensile Strength (250°C) MPa 275
Hardness Kg/mm2 1440
Thermal Conductivity W/mK 35
Co-Efficient of Thermal Expansion 10-6/°C 8.4
Specific Heat J/KgK 880
Dielectric Strength AC - KV/mm 16.9
Dielectric Constant @1MHz 9.8
Dissipation Factor @1KHz 0.0002


Quartz Labware

Thermal Properties

Thermal Conductivity1.38(W/m°K)
Coefficient Of t\Thermal Expansion(0~1000°C)0.55(10-6/°C)
Normal Operating Temperature Continuous Usage~1050°C
Non Continuous Usage~1250°C
Strain Point~1075°C
Annealing Point~1180°C
Hot Pressing Temperature~1700°C - 2100°C
Devitrification TemperatureStarting at ~1000° C. high temperature accelerates Devitrification, especially with surface contaminants such as alkaline solution, salts and vapors.

Physical Properties

Units of Measure Value
Density gm/cc (lb/ft3) 2.2
Porosity %(%) 0
Tensible Strength 106 Pa 48.3
Young's Modulus 106 Pa 71.7
Hardness Kg/mm2 600
Thermal Conductivity W/m°K 1.38
Coefficient of Thermal Expansion 10-6/°C 0.55
Specific Heat J/Kg.°K 740
Dieletric Strength Ac-kv/mm (volts/mil) 30
Dieletric Constant @1MHz 3.82
Index of refraction @ 587.6nm -- 1.4585



Platinum Labware Use and Maintenance



The Pure platinum recipients can be used to melt the following;
  1. Sodium or Potassium carbonate.
  2. Sodium carbonate, sodium nitrite or nitrate.
  3. Sodium borate or sodium metaphosphate. (The platinum is slightly attacked at very high temperature or in reducing atmosphere.
  4. Alkaline bifluorides.
  5. Alkaline bisulphate. (The platinum is slightly attacked above 700 degree centigrade; this can be reduced through the addition of ammonium sulphate)
  6. Alkaline or alkaline earth chlorides in natural atmosphere (The platinum is slightly attacked in the presence of air and above 1000 degree centigrade through the release of chlorine. There is no attack in natural atmosphere.
Nevertheless, platinum does have certain application limits.
Thus the following should not be melted in such recipients.
  1. Free metals.
  2. Alkaline Oxides, hydroxides and peroxides.
  3. Salts of heavy metals (Lead, Tin, Bismuth, Antimony) as well as their organic compounds.
  4. Phosphates in the presence of substances which reduce compounds capable of releasing chlorine.
  5. Cyanides or sulphides.


The pure platinum recipients may be used for evaporation with:
  1. Sulphuric acid in the presence or absence of hydrofluoric acid.
  2. Hydrofluoric acid in the absence of chlorides and other halides.
  3. Hydrochloric acid in absence of oxidizing agents.
  4. Hydroxides or alkaline carbonates.
All basic or neutral solutions may be evaporated in platinum recipient, as can acid solutions except for those containing hydrochloric acid in the presence of an oxidizing agent.


Cleaning & polishing platinum apparatus immediately after use greatly extend their service lives. Immediately after use, the platinum recipients are to be cleaned:
  1. Either by pouring nitric acid solution (diluted with hydrogen peroxide if need be) or a hydrochloric solution in to them.
  2. Or by melting potassium bisulphate, sodium carbonate or borax in them.
Aqua regia or hydrochloric acid in the presence of peroxide are not suited for this owing to the formation of free chlorine which dissolves the platinum.


Agate Mortar and Pestle

Agate is a microcrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks.
Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls. Agate has also been known to fill veins or cracks in volcanic or altered rock underlain by granitic intrusive masses. Such agates, when cut transversely, exhibit a succession of parallel lines, often of extreme tenuity, giving a banded appearance to the section. Such stones are known as banded agate, riband agate and striped agate.

Category Agate Properties
Formula SiO2 silicon dioxide
Color White to grey
Crystal habit Cryptocrystalline silica
Crystal system Rhombohedral Microcrystalline
Cleavage None
Fracture Conchoidal with very sharp edges
Mohs scale hardness 6.5 - 7
Luster Waxy
Diaphaneity Translucent
Specific gravity 2.58 - 2.64


Granite Mortar and Pestle

Granite is a common type of intrusive, felsic, igneous rock which is granular and phaneritic in texture.
A worldwide average of the chemical composition of granite, by weight percent:

SiO2 72.04% (silica)
Al2O3 14.42% (alumina)
K2O 4.12%
Na2O 3.69%
CaO 1.82%
FeO 1.68%
Fe2O3 1.22%
MgO 0.71%
TiO2 0.30%
P2O5 0.12%
MnO 0.05%

It is not easy to measure the hardness of Granite. Granite is a rock composed of multiple minerals, typical Quartz, Feldspar, Biotite and Hornblende. Each of the minerals has a unique hardness. In other words, we can measure the hardness of individual material but not easy of granite as a rock.


80% and 99.5% Alumina for Tubes

Chemical Analysis

Constituents Alumina 80% Alumina 99.5%
Al3O3 Min 80 99.5
SiO2 Max 18 0.2
Fe2O3 Max 0.3 --
Na2O Max 1 0.2

Physical Properties

Constituents Alumina 80% Alumina 99.5%
Color White Ivory
Sp.Gr. - gms/cc 3.2 3.9
Water Absorption 0 0
Max Service Term 1450 1650
Gas Permeability Nil Nil
Hardness R45N 72 83
Chemical Resistivity Good Excellent
Flexural Strength N/mm2 280 365
Tensile Strength N/mm2 --- 260
CTE (RT-14000 C) x 10-6 /°C Max. --- 8.3

The Values are obtained from standard bars & cubes, Data on other shapes shall differ, the data should not be taken as a specification but for general guidance only.