Astrra Chemicals
Chennai, Tamil Nadu
GST No. 33AAAFA7706K1ZN
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| Description | White Powder |
| Subs. Insoluble in acid | 0. 31% |
| Arsenic | Complies |
| Heavy Metals | Complies |
| Barium | Complies |
| Iron | Complies |
| Magnesium and Alkali metals | 0. 63% |
| Chloride | Complies |
| Sulphate | Complies |
| Loss on drying (at 200 Deg.C for 3 hours) | 0.2150% |
| Tapped density | 0.8930 gm/l |
| Particle size | 98.00% through 300 mesh |
| Assay (on dried basis) | 98.90%. |
Product Details:
| Minimum Order Quantity | 100 Kg |
| Brand | Astrra Chemicals |
| Packaging Type | HDPE Bag |
| Packaging Size | 25 kg/bag |
| Magnesium and Alkali metals | 0. 63% |
| Subs Insoluble in acid | 0. 31% |
| Tapped density | 0.8930 gm/l |
| Assay | 98.90% (on dried basis) |
**Calcium Carbonate (CaCO₃) derived from organic sources like oyster shells is a natural, renewable, and highly bioavailable form of calcium. It is composed primarily of aragonite or calcite crystals, which are different crystalline forms of calcium carbonate. Oyster shell-based calcium carbonate offers high purity, trace mineral content, and eco-friendly credentials, making it suitable for a wide range of industries.
✅ Uses & Applications of Oyster Shell-Derived Calcium Carbonate �� 1. Pharmaceuticals & NutraceuticalsCalcium Supplement: Excellent source of dietary calcium, widely used in:
Osteoporosis prevention
Bone and teeth health products
Prenatal and post-menopausal supplements
Antacid formulations: Treats heartburn and acid indigestion.
Calcium Source in Feed: Essential for eggshell formation and bone strength in:
Laying hens
Cattle and livestock
Highly digestible, supports metabolic and reproductive health in animals.
Used as a mild abrasive and thickener in:
Toothpaste
Face scrubs and powders
Natural and skin-friendly, often preferred in organic/natural cosmetic lines.
Acts as an organic liming agent to:
Correct soil acidity
Improve microbial activity and nutrient uptake
Enriches soil with calcium, enhancing plant health.
Used as a filler in eco-cement, putty, and plaster products.
Adds strength and reduces shrinkage in building materials.
Promotes sustainable building practices due to its renewable origin.
Acts as an extender pigment, offering:
Opacity
Whiteness
Better flow and coverage
Natural calcium carbonate improves environmental profile of coatings.
Functions as a coating and filler pigment in eco-friendly paper production.
Enhances brightness, smoothness, and print quality.
As a food additive (E170):
Used in anticaking agents, firming agents, and color retention
Found in chewing gum, baked goods, and fortified products
Organic certification makes it preferred in natural/organic foods.
Used in water purification as a pH adjuster and phosphate remover.
Acts as a carbon sink material in research on carbon capture and storage (CCS).
Product Details:
| Minimum Order Quantity | 50 Kilogram |
| Grade | OYSTER SHELL BASE |
| Packaging Size | 50 |
| Subs Insoluble in acid | 0.31% |
| Magnesium and Alkali metals | 0.63% |
| Tapped density | 0.8930 gm/l |
| Particle size | 98.00% through 300 mesh |
| Assay | 98.90% (on dried basis) |
We are engaged in manufacturing and exporting a Calcium Carbonate Oyster Shell. The salient feature of our natural Powdered Calcium Carbonate is its high wet ability and weather resistance capacity. Our customer can avail these Oyster Shell Powders at affordable prices with us.
**Calcium Carbonate (CaCO₃) derived from organic sources like oyster shells is a natural, renewable, and highly bioavailable form of calcium. It is composed primarily of aragonite or calcite crystals, which are different crystalline forms of calcium carbonate. Oyster shell-based calcium carbonate offers high purity, trace mineral content, and eco-friendly credentials, making it suitable for a wide range of industries.
✅ Uses & Applications of Oyster Shell-Derived Calcium Carbonate �� 1. Pharmaceuticals & Nutraceuticals
Calcium Supplement: Excellent source of dietary calcium, widely used in:
Osteoporosis prevention
Bone and teeth health products
Prenatal and post-menopausal supplements
Antacid formulations: Treats heartburn and acid indigestion.
�� 2. Animal Feed & Poultry
Calcium Source in Feed: Essential for eggshell formation and bone strength in:
Laying hens
Cattle and livestock
Highly digestible, supports metabolic and reproductive health in animals.
�� 3. Cosmetics & Personal Care
Used as a mild abrasive and thickener in:
Toothpaste
Face scrubs and powders
Natural and skin-friendly, often preferred in organic/natural cosmetic lines.
�� 4. Agriculture & Soil Amendment
Acts as an organic liming agent to:
Correct soil acidity
Improve microbial activity and nutrient uptake
Enriches soil with calcium, enhancing plant health.
��️ 5. Construction Materials
Used as a filler in eco-cement, putty, and plaster products.
Adds strength and reduces shrinkage in building materials.
Promotes sustainable building practices due to its renewable origin.
�� 6. Paints, Coatings & Inks
Acts as an extender pigment, offering:
Opacity
Whiteness
Better flow and coverage
Natural calcium carbonate improves environmental profile of coatings.
�� 7. Paper Industry
Functions as a coating and filler pigment in eco-friendly paper production.
Enhances brightness, smoothness, and print quality.
�� 8. Food Industry
As a food additive (E170):
Used in anticaking agents, firming agents, and color retention
Found in chewing gum, baked goods, and fortified products
Organic certification makes it preferred in natural/organic foods.
⚗️ 9. Environmental & Industrial Applications
Used in water purification as a pH adjuster and phosphate remover.
Acts as a carbon sink material in research on carbon capture and storage (CCS).
Product Details:
| Minimum Order Quantity | 50 Kg |
| Packaging Size | 25-50 kg |
| Organic | yes |
| State Of Origin | Pan India |
| Variety Available | Oyster Mushroom |
| Brand | Astrra Chemicals |
| Packaging Type | HDPE Bag |
| Grade | Technical Grade |
| Formula | CaCO3 |
| Molar mass | 100.0869 g/mol |
Additional Information:
Product Details:
| Minimum Order Quantity | 50 Kg |
| Grade Standard | Industrial Grade |
| Form | Powder |
| Purity | ≥90% |
| Packaging Size | 50 Kgs |
| Packaging Type | PP Bag |
| Organic | Indian |
| State Of Origin | Pan India |
| Variety Available | Oyster Mushroom |
| Brand | Astrra Chemicals |
| Chemical Formula | CaSO4 |
| Loss On Ignition | Between 4.5 To 8% |
| Molar mass | 136.14 g/mol |
Calcium Sulphate (CaSO₄), available in forms such as gypsum (dihydrate), plaster of Paris (hemihydrate), and anhydrite, is a versatile inorganic mineral widely used across industries.
1. Construction & Building MaterialsPlaster of Paris for wall finishing, false ceilings, cornices, and mouldings
Gypsum boards, blocks, wall panels, and partition systems
Cement additive for setting time control
Used in self-leveling compounds and repair mortars
Regulates cement hydration and prevents flash setting
Improves workability and finish
Used in specialty cements and dry mix mortars
Used for ceramic moulds, casting, and slip casting
Provides smooth surface finish and dimensional accuracy
Soil conditioner to improve soil structure and permeability
Source of calcium and sulphur nutrients
Helps reclaim sodic and alkaline soils
Food additive (E516) as firming agent and flour treatment
Pharmaceutical excipient and tablet diluent
Used in dental plasters and casts
(Only food/pharma-grade material applicable)
Functional filler to improve opacity, smoothness, and cost efficiency
Enhances film build and surface texture
Used as a desiccant and drying agent
Filler in rubber, plastics, and adhesives
Used in water treatment and waste stabilization
Orthopedic casts, surgical moulds, and dental impressions
(Medical-grade material only)
Excellent setting and moulding properties
Non-toxic, fire-resistant, and eco-friendly
Cost-effective and widely available
Versatile across multiple industries
Additional Information:
Product Details:
| Minimum Order Quantity | 100 Kg |
| Color | White |
| Application | Mushroom cultivation |
| State Of Matter | Powder |
| Precipitation State | Un-Precipitated |
| Purity % | 99% and above |
| Grade Standard | Technical Grade, Industrial Grade, Commercial Grade |
**Calcium Carbonate (CaCO₃) derived from organic sources like oyster shells is a natural, renewable, and highly bioavailable form of calcium. It is composed primarily of aragonite or calcite crystals, which are different crystalline forms of calcium carbonate. Oyster shell-based calcium carbonate offers high purity, trace mineral content, and eco-friendly credentials, making it suitable for a wide range of industries.
✅ Uses & Applications of Oyster Shell-Derived Calcium Carbonate �� 1. Pharmaceuticals & NutraceuticalsCalcium Supplement: Excellent source of dietary calcium, widely used in:
Osteoporosis prevention
Bone and teeth health products
Prenatal and post-menopausal supplements
Antacid formulations: Treats heartburn and acid indigestion.
Calcium Source in Feed: Essential for eggshell formation and bone strength in:
Laying hens
Cattle and livestock
Highly digestible, supports metabolic and reproductive health in animals.
Used as a mild abrasive and thickener in:
Toothpaste
Face scrubs and powders
Natural and skin-friendly, often preferred in organic/natural cosmetic lines.
Acts as an organic liming agent to:
Correct soil acidity
Improve microbial activity and nutrient uptake
Enriches soil with calcium, enhancing plant health.
Used as a filler in eco-cement, putty, and plaster products.
Adds strength and reduces shrinkage in building materials.
Promotes sustainable building practices due to its renewable origin.
Acts as an extender pigment, offering:
Opacity
Whiteness
Better flow and coverage
Natural calcium carbonate improves environmental profile of coatings.
Functions as a coating and filler pigment in eco-friendly paper production.
Enhances brightness, smoothness, and print quality.
As a food additive (E170):
Used in anticaking agents, firming agents, and color retention
Found in chewing gum, baked goods, and fortified products
Organic certification makes it preferred in natural/organic foods.
Used in water purification as a pH adjuster and phosphate remover.
Acts as a carbon sink material in research on carbon capture and storage (CCS).
Product Details:
| Minimum Order Quantity | 50 Kg |
| APPEARANCE | WHITE POWDER |
| ORIGIN | OYSTER SHELL |
| TYPE | COMMERCIAL GRADE |
**Calcium Carbonate (CaCO₃) derived from organic sources like oyster shells is a natural, renewable, and highly bioavailable form of calcium. It is composed primarily of aragonite or calcite crystals, which are different crystalline forms of calcium carbonate. Oyster shell-based calcium carbonate offers high purity, trace mineral content, and eco-friendly credentials, making it suitable for a wide range of industries.
✅ Uses & Applications of Oyster Shell-Derived Calcium Carbonate �� 1. Pharmaceuticals & NutraceuticalsCalcium Supplement: Excellent source of dietary calcium, widely used in:
Osteoporosis prevention
Bone and teeth health products
Prenatal and post-menopausal supplements
Antacid formulations: Treats heartburn and acid indigestion.
Calcium Source in Feed: Essential for eggshell formation and bone strength in:
Laying hens
Cattle and livestock
Highly digestible, supports metabolic and reproductive health in animals.
Used as a mild abrasive and thickener in:
Toothpaste
Face scrubs and powders
Natural and skin-friendly, often preferred in organic/natural cosmetic lines.
Acts as an organic liming agent to:
Correct soil acidity
Improve microbial activity and nutrient uptake
Enriches soil with calcium, enhancing plant health.
Used as a filler in eco-cement, putty, and plaster products.
Adds strength and reduces shrinkage in building materials.
Promotes sustainable building practices due to its renewable origin.
Acts as an extender pigment, offering:
Opacity
Whiteness
Better flow and coverage
Natural calcium carbonate improves environmental profile of coatings.
Functions as a coating and filler pigment in eco-friendly paper production.
Enhances brightness, smoothness, and print quality.
As a food additive (E170):
Used in anticaking agents, firming agents, and color retention
Found in chewing gum, baked goods, and fortified products
Organic certification makes it preferred in natural/organic foods.
Used in water purification as a pH adjuster and phosphate remover.
Acts as a carbon sink material in research on carbon capture and storage (CCS).
Additional Information:
Product Details:
| Purity | 99% |
| Brand | Astrra |
| Color | White |
| Raw Material | Oyster Mushroom |
| Form | Powder |
We are engaged in manufacturing and exporting a Calcium Carbonate Oyster Shell.
Oyster Shell Powder is a natural source of calcium carbonate (CaCO₃) and is widely used in mushroom cultivation as a soil or substrate conditioner. It helps maintain optimal pH levels and provides essential calcium, which supports healthy mycelial growth and fruiting.
�� Uses & Applications of Oyster Shell Powder in Mushroom Cultivation✅ 1. pH Buffer and StabilizerMain Role: Regulates and buffers the pH of the mushroom substrate or casing soil.
Mushrooms like Agaricus bisporus (button mushroom) prefer a substrate pH of 6.5–7.5.
Oyster shell powder neutralizes excess acidity, ensuring optimal conditions for:
Mycelium colonization
Enzyme activity
Nutrient absorption
Provides slow-releasing calcium, which:
Strengthens the cell walls of fungal hyphae
Promotes sturdy and healthier fruit bodies
Prevents calcium-deficiency disorders in long-cycle mushroom crops
Often used in the casing mix (non-nutritive layer applied on colonized compost), especially for:
Button mushrooms
Portobello mushrooms
Common mix: Peat moss + Vermiculite + Oyster shell powder (to adjust pH and calcium level)
Adds porosity and improves aeration in the substrate or casing.
Reduces compaction and enhances gas exchange, crucial for mushroom fruiting.
Acts as a natural, organic alternative to agricultural lime (CaCO₃) or chalk.
Preferred in organic mushroom farming due to its biodegradable and non-toxic nature.
| Stage | How Oyster Shell Powder Is Used |
|---|---|
| Composting Phase | Added to compost to control acidity |
| Spawning Phase | Mixed with substrate to buffer pH |
| Casing Layer | Blended with peat moss or vermiculite |
| Post-harvest Amendment | Reapplied to maintain pH for subsequent flushes |
2–5% by weight of total substrate or compost
0.5–1 kg per 100 kg of dry substrate (adjusted based on initial pH)
Casing mix: ~5–10% of casing material (along with gypsum or lime)
| Benefit | Role in Mushroom Cultivation |
|---|---|
| pH regulation | Keeps substrate within optimal range (6.5–7.5) |
| Calcium source | Supports mycelium and fruit body development |
| Improves substrate structure | Enhances aeration and gas exchange |
| Sustainable & organic | Preferred in eco-friendly farming practices |
| Prevents acid buildup | Essential for compost longevity and productivity |