レプコ List of Products and Services

Improvement of dispersibility and other surface treatments have been frequently inquired about in recent years. Mica × Surface Treatment Please feel free to contact us. For more detailed information, please feel free to download. 　　　　　　　　　↓↓↓↓↓↓↓

• Rust Inhibitor
• Coating film waterproofing material/permeable waterproofing material
• Anti-rot, anti-termite, anti-mold material

Explanation of the characteristics of Lepco mica. We welcome your requests for various applications, so please feel free to contact us. 【Main physical properties of mica】 ■ Rigidity ■ Dimensional stability ■ Heat resistance ■ Damping properties ■ Corrosion resistance ■ Weather resistance ■ Barrier properties ■ Insulation properties ■ Lubricity (slip properties) (sliding properties) * We handle various sizes and grades of mica products, primarily Muscovite (S grade) and Phlogopite (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, and adhesives. Please feel free to download for more detailed information.

• Gypsum board and moldings
• cement
• Bridge Materials

Our magnetite (MagniF) is magnetite that has been mined, finely crushed, and dried in Sweden. Magnetite (MagniF) is one of the components that equalizes the friction coefficient and the heat transfer from brake pads to brake discs. Since it is a natural product and not a synthetic one, cost reduction is possible! If you are looking for magnetic fillers or high-density fillers, please give it a try! Feel free to download for more detailed information.

• Metal plate
• Rust Inhibitor
• Casting and metal decoration

"Magni F," a high-purity magnetite, is a naturally occurring mineral with ferrimagnetic properties. It is a high-density filler with a specific gravity of 5.2, excelling in magnetism, thermal conductivity, electrical conductivity, and heat retention. When utilized as a "tracer" for X-rays and induction wireless applications, it can impart metal detectability while maintaining functional characteristics, particularly offering F grade for food packaging applications where compliance with hygiene standards is required. The cost performance is also outstanding! 【Features】 ■ Environmentally friendly high-purity natural magnetite ■ Long-term supply stability due to abundant reserves ■ Sound and vibration damping effects due to high density ■ Excellent thermal and electrical conductivity ■ X-ray and metal detectability due to ferrimagnetism Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Lead Sheet
• Rust Inhibitor
• Rubber sheet

MagniF is also active in the food processing industry◎ Using the magnetic properties of MagniF, it detects foreign substances and prevents the contamination of fine metals. If you are considering magnetic fillers, high-density fillers, or metal detection fillers, please take a moment to consider us◎ Feel free to download detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Metal plate
• Rust Inhibitor
• Casting and metal decoration

Magnetite (MagniF) is a filler that is active in various applications. In terms of resins, it has a proven track record with PP, as well as engineering plastics like PA, PC, and POM, and with super engineering plastics like PEEK. If you are considering magnetic fillers or high-density fillers, please give it a thought◎ Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Metal plate
• Rust Inhibitor
• Casting and metal decoration

Our magnetite (MagniF) is magnetite that has been mined, micronized, and dried in Sweden. Magnetite (MagniF) is one of the components that equalizes the friction coefficient and the heat transfer from brake pads to brake discs. Since it is a natural product rather than a synthetic one, cost reduction is possible! If you are looking for magnetic fillers or high-density fillers, please give it a try! Feel free to download for more detailed information.

• Metal plate
• Rust Inhibitor
• Casting and metal decoration

- Mica - White Mica - Silk Mica - Clay - Talc - Chrysotile (Asbestos) - Wollastonite - Calcium Carbonate - Barium Sulfate - Magnetite This is a summary of the chemical compositions of the above 10 types. It's a property table that you wouldn't expect to find! Feel free to download for more detailed information.

• Reinforcement and repair materials
• glue
• Waterproof sheet

This is mica that has been pre-fired at high temperatures. By removing moisture from the mica, it prevents the moisture inside from escaping and foaming during compounding at high temperatures. Firing the mica at high temperatures results in fewer impurities and lower loss on ignition compared to standard products. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Decorative slate
• Gypsum board and moldings
• Interior wall decoration

Our company handles natural mica, which offers potential cost reductions compared to synthetic mica and synthetic muscovite. Natural mica does not significantly lack in physical properties. If you are interested, please feel free to contact us. For more detailed information, please feel free to download. 　　　　　　　　　↓↓↓↓↓↓↓

• Rust Inhibitor
• Coating film waterproofing material/permeable waterproofing material
• Anti-rot, anti-termite, anti-mold material

Q. What is the recommended filling amount when using mica as a filler? A. This is actually a surprisingly common question, but it cannot be answered definitively... Finding the right balance that maximizes the effect of the filler without compromising the function of the resin is quite challenging. The aspect ratio and average particle size vary for different sizes, which slightly changes the properties of the mica. For applications where you do not want any color to show, M grade (white mica) is recommended, while for those focused on physical properties, S grade (gold mica) is preferred. Depending on the type of resin and its application, the grade, size, and filling amount will all change, so I would appreciate the opportunity to discuss the optimal filling amount in a meeting. Lastly, if we consider only the properties of mica without taking into account the type of resin or the thickness of the film, the properties of mica tend to improve as the average particle size increases, and there is a tendency for the physical properties to significantly increase with a filling rate of 20% to 30% or more. Feel free to download the detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Phenol Foam
• Anti-rot, anti-termite, anti-mold material
• Exterior coating materials

Repcomica, known for its high aspect ratio, cannot provide all details, but we measure the average particle size using the method described below and calculate the aspect ratio by dividing the average particle size by the average thickness. If you would like to know more about the detailed calculation method for the aspect ratio, please feel free to contact us. Q. Particle size measurement method A. We measure using laser method and dry sieving method. S grade (mica) S-150H, S-200HG M grade (white mica) M-60, M-200 The above are measured using the dry sieving method. S grade (mica) S-325, S-400, S-XF M grade (white mica) M-325, M-400, M-XF The above are measured using the laser method. Please feel free to download the detailed content. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Exterior coating materials
• Coating film waterproofing material/permeable waterproofing material

Q. Please tell me your recommended grade. A. It's actually a surprisingly common question, but I can't give a definitive answer... The recommended grade can vary greatly depending on the intended use, and I would like to know various details such as: "What kind of application are you considering?" "What resin or paint will you be compounding with mica?" "Are you concerned about color or the unique sparkle of mica?" "How much do you want to enhance the physical properties using mica?" And so on, I would like to know various pieces of information! I understand that there may be cases where you can't disclose certain information, but I would like to hear as much detail as possible in order to propose the most suitable grade for you. Please feel free to download the detailed content. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material
• Decorative slate

Slipperiness (sliding property) Enhances the sliding characteristics of molded products and smoothens the surface. Mica is mainly used as the NAO (Non-Asbestos Organic) material for brake pads. Since the discontinuation of asbestos in 1990, mica has been the filler that has been switched to. With mica's unique moderate friction effect, it can prevent squeaking, reduce slipping, and eliminate abnormal noises. Repco mica is also used primarily in friction materials, as well as in rubber, mold release agents, and adhesives. For more detailed information, feel free to download. 　　　　　　　　　↓↓↓↓↓↓↓

• Exterior coating materials
• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material

Barrier properties (Barrier effect) Suppresses the permeation of gases and moisture through the tortuous path effect! Delays aging and provides corrosion resistance. Used in marine coatings, films, adhesives, and interestingly, as coatings for packaging materials for fresh food. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Exterior coating materials
• Waterproof sheet

Vibration characteristics Suppresses the transmission of vibrations. In vibration-damping applications, the effect increases in proportion to weight and thickness, but mica has a high effectiveness relative to the amount added. For the above reasons, it has become an indispensable filler for automotive parts that require weight reduction. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material
• Exterior coating materials

Electrical Insulation Due to its high electrical insulation properties, it is used in electrical components and home appliances. Mainly, it is used in home appliances, electronic device components, specialty paper, coatings, semiconductor-related products, etc. Because it is easy to process, it is found in various places, from familiar aspects of daily life to niche applications. *We handle a variety of mica products in different sizes and grades, primarily focusing on Muscovite (S grade) and Phlogopite (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, and adhesives. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Exterior coating materials
• Zeolite humidity control material

Heat Resistance Utilizing the heat-resistant properties to enhance the heat resistance of products. Additionally, it is advantageous that no physical property changes occur even under high temperatures during molding. Mica has different physical properties against heat between phlogopite and muscovite. However, both possess strong heat-resistant properties. 【Phlogopite】 - Melting Point: 1500°C - Dehydration Start Temperature: 800°C 【Muscovite】 - Melting Point: 1200°C - Dehydration Start Temperature: 350°C As shown above, phlogopite has even stronger heat-resistant properties. Furthermore, it is gaining attention as a non-combustible filler. Mica has a high aspect ratio and excellent barrier properties. By using it as a filler, the non-combustible effect is created, which can enhance the fire resistance of paints and resins. Additionally, there are specially processed micas that are made to be even more heat-resistant. Please feel free to contact us. *The image shows data for "Grade" and "Percentage" during mica filling in PP. For more detailed information, please feel free to download. ↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material
• Exterior coating materials

Rigidity (Bending Elasticity) Improves the strength of the product and allows it to withstand bending and twisting. Dimensional Stability Reduces shrinkage rates to prevent warping and cracking, and minimizes molding shrinkage to provide surface reinforcement effects. Mica balances molding shrinkage in both the MD (machine direction) and TD (transverse direction). Due to the above characteristics, it is used in various applications such as automotive parts, electronic devices, films, marine coatings, exterior materials, interior materials, sealants, adhesives, gasket materials, and friction materials. For more detailed information, please feel free to download. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material
• Exterior coating materials

Super Engineering Plastics (Super Empla) This refers to high-performance resins that have very high heat resistance and mechanical strength. They can be used for long periods at temperatures above 150°C. Additionally, they are lightweight yet possess very high mechanical strength, making them suitable as substitutes for metal parts. Examples include PEEK (Polyether Ether Ketone), PPS (Polyphenylene Sulfide), and PI (Polyimide). *We handle various sizes and grades of mica products, primarily focusing on gold mica (S grade) and white mica (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, and adhesives. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Heat-insulating paint for exterior walls (roofs, rooftops, etc.)
• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material

Plastics that are primarily used industrially. Compared to general-purpose plastics, they excel in mechanical strength and heat resistance, making them suitable for industrial parts and other applications. The definition of engineering plastics (often abbreviated as "Enpla") is not very clear, but it is said to include: Tensile strength: 500 kgf/cm² (49 MPa) or more Flexural modulus: 20,000 kgf/cm² (1,960 MPa) or more Heat resistance: over 100°C Among engineering plastics, five commonly used types are referred to as the "five major engineering plastics." PA (Polyamide): Often referred to by the DuPont trademark name Nylon. PC (Polycarbonate) Polyester (PBT, PET) POM (Polyacetal): Also known as polyoxymethylene Modified PPE (Modified Polyphenylene Ether) *We handle various sizes and grades of mica products, focusing on gold mica (S grade) and white mica (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, and adhesives. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Gypsum board and moldings
• Paving Materials
• Solid wood flooring/outdoor

The performance itself is not particularly high, but it refers to plastics (thermoplastics) that are inexpensive and used/consumed in large quantities as everyday items. It is characterized by a relatively simple structure (composed only of carbon in the main chain), heat resistance of about 100°C, and the ability to change shape freely. It accounts for about 80% of Japan's plastic production. Types of general-purpose plastics include: PVC (polyvinyl chloride), PS (polystyrene), ABS, AS, PMMA (acrylic), PE (polyethylene), PP (polypropylene), etc. The representative general-purpose plastics that are particularly produced and consumed in large quantities are commonly referred to as the "five major general-purpose plastics": PVC, PE (HD-PE, LD-PE), PS, and PP. It also has good compatibility with lepcomica and is used as a filler in various resins. *We handle a variety of mica products in different sizes and grades, focusing on gold mica (S grade) and white mica (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, adhesives, etc. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Reinforcement and repair materials
• Paving Materials
• Decorative slate

I compared five representative inorganic fillers that are often heard of as a comparison to mica. Mica Talc Glass beads Wollastonite Milled fiber Glass fiber Please compare the physical properties of each. Feel free to download the detailed content. ↓↓↓↓↓↓↓

• Solid wood flooring/outdoor
• Gypsum board and moldings
• Paving Materials

Explanation of the characteristics of Lepco mica. We welcome your requests for various applications, so please feel free to contact us. 【Main physical properties of mica】 ■Rigidity ■Dimensional stability ■Heat resistance ■Damping properties ■Corrosion resistance ■Weather resistance ■Barrier properties ■Insulation properties ■Lubricity (slipperiness) (sliding properties) *We handle various sizes and grades of mica products, primarily Muscovite (S grade) and Phlogopite (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, and adhesives. Please feel free to download detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Gypsum board and moldings
• cement
• Bridge Materials

Lepco Mica = High Aspect Ratio What is aspect ratio? How is it calculated? It's something you might not want to ask now, but for those who want to know! 【Main Properties】 ■ Rigidity ■ Dimensional Stability ■ Heat Resistance ■ Damping Properties ■ Corrosion Resistance ■ Weather Resistance ■ Barrier Properties ■ Insulation Properties ■ Lubricity (Slipperiness) (Sliding Properties) * We handle various sizes and grades of mica products, mainly gold mica (S grade) and white mica (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, adhesives, and more. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• cement
• Coating film waterproofing material/permeable waterproofing material
• Paving Materials

The MagniF series magnetite is an environmentally friendly material because it is a naturally occurring mineral. The MagniF composite paint with ferromagnetic properties imparts the ability to attract magnetic forces in the painting area. Additionally, while being a magnetic filler, it has superior rust resistance compared to iron powder-based fillers. Since our products are natural rather than synthetic, we can also keep prices down. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Rust Inhibitor
• Heat-shielding materials

The MagniF series magnetite is an environmentally friendly material because it is a naturally occurring mineral. With a specific gravity of 5.2 g/cc, this high-density filler increases the density of plastic composites, allowing for weight gain even in small volumes. It is particularly used in the automotive industry for components that require sound and vibration damping effects. Since our products are natural, we can offer them at a lower price compared to synthetic alternatives. Customers looking for magnetic fillers are encouraged to consider our offerings. Feel free to download more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Soundproofing Sheet
• Bridge Materials
• Anti-vibration rubber

By combining "coloring × mica flakes × amount of addition," a wide range of colors can be expressed, from a dazzling brilliance to a sparkling luster. It adds color to industrial materials such as resins, paints, ceramics, and cement. 【Features】 ■ Size-controlled particle size distribution ■ Large flakes maintaining a high aspect ratio ■ Wide range of colors ■ Weather resistance, solvent resistance, UV resistance ■ Various properties of mica (rigidity, heat resistance, dimensional stability) 【Representative Grades】 MILIOS Black (black) MILIOS Ultramarine (ultramarine) MILIOS Green (green) MILIOS Red (red) MILIOS Gold (gold) MILIOS Yellow (yellow) * We handle various sizes and grades of mica products, mainly gold mica (S grade) and white mica (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealants, and adhesives. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material
• Exterior coating materials

"Magni F," a high-purity magnetite, is a naturally occurring mineral with ferrimagnetic properties. It is a high-density filler with a specific gravity of 5.2, excelling in magnetism, thermal conductivity, electrical conductivity, and heat retention. When utilized as a "tracer" for X-rays and induction radio, it can impart metal detectability while maintaining functional characteristics, particularly providing F grade for food packaging applications where compliance with hygiene standards is required. The cost performance is outstanding! 【Features】 ■ Environmentally friendly high-purity natural magnetite ■ Long-term supply stability due to abundant reserves ■ Sound and vibration damping effects due to high density ■ Excellent thermal and electrical conductivity ■ X-ray and metal detectability due to ferrimagnetism Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Solid wood flooring/outdoor
• Decorative slate

The "Repkomica M Series" is a product made from naturally occurring muscovite that has been refined and crushed at a domestic factory. It has a high whiteness and can be easily incorporated into products that require coloring. Additionally, it excels in insulation resistance, making it particularly high-performing in applications such as electronic components. When filled into industrial materials like plastics, paints, and rubber, it is expected to improve and impart properties such as rigidity, dimensional stability, and heat resistance. 【Features】 ■ High whiteness and easy incorporation into products requiring coloring ■ Excellent insulation resistance ■ Particularly high performance in applications such as electronic components ■ Expected to improve and impart properties such as rigidity, dimensional stability, and heat resistance ■ Flexible response to surface treatment and custom grade production ■ Short delivery times supported by domestic facilities

• Exterior coating materials
• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material

The "Repkomica S Series" is a product made from naturally occurring mica that has been refined and crushed at a domestic factory. It maximizes the high elasticity inherent in mica through manufacturing techniques developed over many years, resulting in a high aspect ratio (average particle size/thickness), which is a key feature of flake fillers. When incorporated into industrial materials such as plastics, paints, and rubber, it is expected to impart various functionalities centered around rigidity, dimensional stability, and heat resistance. 【Features】 ■ Long-term supply stability due to abundant reserves ■ Quality stability through domestic production system ■ No crystalline silica detected (detection level: below quantification limit) ■ Various grades available based on average particle size ■ Flexible response to custom grade orders and surface treatments ■ Short delivery times supported by domestic bases Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Exterior coating materials
• Anti-rot, anti-termite, anti-mold material
• Coating film waterproofing material/permeable waterproofing material

This document is a table showing examples of applications for "mica" that our company handles. It categorizes resins, paints, building materials, and others in detail, distinguishing them based on nine physical properties such as rigidity, dimensional stability, and heat resistance. Please make use of it. 【Physical Properties (Excerpt)】 ■ Rigidity ■ Dimensional Stability ■ Heat Resistance ■ Damping Properties ■ Corrosion Resistance ■ Weather Resistance ■ Barrier Properties ■ Insulation Properties ■ Lubricity (Slipperiness) (Friction Properties) Feel free to download the detailed content.

• Anti-rot, anti-termite, anti-mold material
• Heat-insulating paint for exterior walls (roofs, rooftops, etc.)
• Exterior coating materials

"Mica" is a mineral classified as a silicate aluminum compound. The mica products we handle are high-purity, high-quality, high-aspect-ratio flaky powders, and we have established a stable supply system centered around our domestic factories. We offer a wide range of grades with average particle sizes from a few micrometers to several hundred micrometers, allowing for flexible responses tailored to our customers' applications and requests. Additionally, since we mainly process raw materials for dry grinding, we achieve high cost performance. 【Features】 ■ A mineral classified as a silicate aluminum compound ■ Harmless to the human body and eco-friendly ■ High-purity, high-quality, high-aspect-ratio flaky powders ■ A stable supply system centered around our domestic factories ■ Flexible responses tailored to customers' applications and requests Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Solid wood flooring/outdoor
• cement
• Paving Materials

"Repkomica" is a mica product that is expected to be not only a high-performance filler but also an environmentally friendly material. In various fields such as automotive parts, electrical products, precision instruments, and building materials, it has a proven track record as a flake filler and reinforcement material with unique mica characteristics. There are products such as "Repro Mica S Grade," which is made from naturally occurring gold mica that has been refined and crushed, and "Repro Mica M Grade," which is made from refined and crushed white mica. 【Properties】 ■ Rigidity: Improved bending strength and bending elastic modulus ■ Dimensional stability: Reduced molding shrinkage, preventing warping and cracking ■ Heat resistance: Improved heat distortion temperature ■ Corrosion resistance: Protects the base material by forming a coating ■ Vibration damping: Reduces vibrations through multilayering ■ Barrier properties: Exhibits a bending effect to prevent gas and moisture permeability ■ Insulation: Enables active use in electronic components and more ■ Lubricity (slip property) (sliding property): Allows for use in release agents and reduces wear on parts and molds Please feel free to download detailed information.

• Anti-rot, anti-termite, anti-mold material
• Zeolite humidity control material
• Coating film waterproofing material/permeable waterproofing material