Windora Materials LLC
Your Reliable Northern Industrial Partner
Description
✦Calcite—A natural calcium carbonate crystalline mineral, centered on high purity and unique crystal characteristics. With excellent optical properties and processability, it provides high-value functional raw material solutions for optics, chemicals, fillers and other fields, serving as an ideal choice for achieving precision applications and performance enhancement.
1. Crystal · More Pure
Diverse crystal forms, commonly exhibiting complete crystal shapes such as rhombohedron and scalenohedron, with perfect cleavage; high-purity calcite can achieve over 99% calcium carbonate content, featuring high whiteness and low impurities, serving as a high-quality raw material for producing high-value-added products.
2. Application · More Precise
It serves not only as a high-end white filler in industrial fields such as plastics, rubber, coatings, and papermaking, but also as the core material for optical polarizing prisms (Iceland spar). It is also widely used in scenarios with stringent requirements for purity and particle size, such as medicine, food additives, and precision chemical engineering.
3. Chemistry · More Capable
Its chemical composition is calcium carbonate, which vigorously bubbles upon contact with dilute hydrochloric acid, exhibiting high reactivity. Through calcination, it can be converted into calcium oxide (quicklime), and then into calcium hydroxide and other calcium-based products. Belonging to the same calcium-based material system as limestone, its crystalline form endows it with better dispersibility and processing properties.
4. Optical Function · More Value-Added
Pure transparent crystals (Iceland spar) exhibit significant birefringence, serving as a key material for manufacturing core components of polarizing microscopes and optical instruments. Ordinary-grade calcite, after ultrafine grinding and surface modification, can significantly enhance the gloss, whiteness, and mechanical properties of downstream products.
CAL
Calcite
Description: Calcite, primarily composed of calcium carbonate, often contains trace elements such as magnesium, iron, and manganese. It decomposes at high temperatures, releasing carbon dioxide and forming calcium oxide (quicklime). As a common carbonate mineral, calcite is the core constituent of limestone and marble, and is also frequently used as an industrial filler and optical material. In industry, it serves as a white filler for plastics, rubber, paints, and paper-making.
Specifications
| Project | Unit | Spec | Method |
| SiO₂ | ％ | ＜0.1 | GB/T 3286.1-2012 |
| Fe₂O₃ | ％ | ＜0.1 | |
| Al₂O₃ | ％ | ＜0.1 | |
| MgO | ％ | ≥0.4 | |
| CaO | ％ | ≥55 | |
| CaCO₃ | ％ | ＞98 | |
| LOl | ％ | ≥43 | *WM/CAL-2026.01 |
| Whiteness | / | ＞93 | |
| pH | / | 8.1 |
Notes: * WM/CAL-2026.01 is Windora Materials LLC. Enterprise Standard.
Storage & Handling
Storage: Store under dry conditions and reseal immediately after opening the bag.
Shelf life: From the date of shipment, keep the packaging intact and the shelf life is 12 months. Packaging:25kg standard packaging or customized packaging according to customer requirements.
Safety: Low hazard, fire and explosion proof, non-toxic.
Transportation: Multiple compliant transportation options available.
Previous
Next
Calcite
A natural calcium carbonate crystalline mineral, centered on high purity and unique crystal characteristics. With excellent optical properties and processability, it provides high-value functional raw material solutions for optics, chemicals, fillers and other fields, serving as an ideal choice for achieving precision applications and performance enhancement.
Keywords:Calcite
Category:
Company Profile
Windora Materials LLC is a modern mining enterprise located in Kuandian, Liaoning, China, specializing in the mining, advanced processing, and sales of non‑metallic minerals such as brucite and wollastonite. The company’s main products include magnesium hydroxide flame retardant (MDH), wollastonite (WOL), talc (TAL), and aluminum hydroxide (ATH) series, which are widely used in PE/PP/PVC, cable compounds, building plastics, new‑energy cables (photovoltaic/wind power/energy storage), and environmental protection applications.
FAQs
What kind of company is your company?
Windora Materials LLC is a modern mining enterprise located in Kuandian, Liaoning, China, specializing in the mining, advanced processing, and sales of non‑metallic minerals such as brucite and wollastonite. The company’s main products include magnesium hydroxide flame retardant (MDH), wollastonite (WOL), talc (TAL), and aluminum hydroxide (ATH) series, which are widely used in PE/PP/PVC, cable compounds, architectural plastics, new‑energy cables (photovoltaic/wind power/energy storage), and environmental protection applications.
What is your company’s production capacity and quality system like?
The company has established a specialized brucite and wollastonite powder processing facility that went into operation in 2012, with an annual processing capacity of 120,000 tons. The powder processing employs a dual-system configuration featuring both air jet mills and ring roller mills. These two systems can operate independently to meet diverse order requirements, or they can work in coordination to create a complete processing flow—from coarse crushing to ultrafine grinding—jointly ensuring stable production capacity and controllable product quality.
Can I visit your factory?
We warmly welcome prospective clients and partners to visit and conduct site inspections. Please make a reservation in advance via the “Contact Us” form on our website, and we will arrange professional reception services for you.
What is the minimum order quantity (MOQ)?
We offer flexible collaboration models for clients of all sizes. For standard products, we have reasonable MOQs. For new customers or sample orders, we also provide competitive MOQ policies. Please consult our sales representatives for details.
What are the payment methods and delivery times?
We accept multiple payment methods, including T/T (telegraphic transfer), Alipay, and WeChat Pay. The delivery time depends on the order quantity and product type; typically, production is completed and shipment arranged within 30 days after receipt of the deposit.
Do you provide samples? How are samples charged?
We encourage customers to test samples before placing bulk orders. Samples are subject to a fee, but if you place a bulk order afterward, the sample cost can be deducted from your invoice. Please contact us for specific sample information.
How are your goods transported?
We maintain long-term partnerships with several internationally renowned logistics companies for both ocean and air freight forwarding. We can provide the most cost‑effective and fastest shipping solutions based on your specific needs, and assist you in handling customs clearance documents.
What should you do if there are quality issues with a product?
We are fully confident in the quality of our products and offer comprehensive quality assurance. In the rare event that you suspect a quality issue with the product you received, please stop using it immediately and contact our customer service or sales representative as soon as possible. We will then provide an appropriate solution based on the specific circumstances.
Consult Now
Contact us now for a free expert consultation!
PRODUCT SEARCH
Quickly find the products you need!
Offer competitive products.
PRODUCT CUSTOMIZATION
Couldn’t find the product you’re looking for?
Continuously create greater value for customers.
