レプコ List of Products and Services

Surface treatment, which has seen an increase in inquiries recently, including improvements in dispersibility. Mica × Surface Treatment Please feel free to contact us. For more detailed information, feel free to download. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

Explanation of the characteristics of Lepco mica. We welcome your requests for various applications, so please feel free to contact us. 【Main 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 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 detailed information.

• plastic
• Engineering Plastics
• Organic Natural Materials

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.

• Organic Natural Materials
• magnet
• Engineering Plastics

"Magni F," a high-purity magnetite, is a natural mineral with ferrimagnetic properties. It is a high-density filler with a true 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 Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• magnet
• Other metal materials

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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• magnet
• Engineering Plastics

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

• Organic Natural Materials
• magnet
• Engineering Plastics

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 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• magnet
• Engineering Plastics

- 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 might not have expected! Feel free to download for more detailed information.

• Organic Natural Materials
• plastic
• Rubber

This is mica that has been pre-fired at high temperatures. By removing moisture from the mica, it prevents the moisture inside the mica from escaping and causing 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Other polymer materials
• plastic
• Engineering Plastics

Our company handles natural mica, which can be expected to reduce costs 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

Q. What is the recommended filling amount when using mica as a filler? A. This is actually a surprisingly common question, but there isn't a straightforward answer... Finding the right balance that maximizes the effectiveness of the filler without compromising the functionality of the resin is quite challenging. As the aspect ratio and average particle size change for different sizes, the physical properties of mica also vary slightly. For applications where you don't want any color to show, M grade (white mica) is recommended, while S grade (gold mica) is preferred if physical properties are the priority. 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 physical properties of mica without taking into account the type of resin or the thickness of the film, the larger the average particle size of mica, the better its physical properties tend to be, with a filling rate of 20% to 30% or more showing significant improvements in those properties. Please feel free to download the detailed information.

• plastic
• Engineering Plastics
• Organic Natural 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 method for calculating the aspect ratio, please feel free to contact us. Q. Particle Size Measurement Method A. We measure using laser methods and dry sieving methods. S Grade (Muscovite) S-150H, S-200HG M Grade (White Mica) M-60, M-200 The above are measured using the dry sieving method. S Grade (Muscovite) 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

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, such as: "What kind of application are you considering?" "What resin or paint are you planning to compound 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?" I would like to know various pieces of information! I understand that there may be cases where you cannot disclose certain information, but I would like to hear as much detail as possible in order to propose the most suitable grade for you. Feel free to download the detailed content. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Organic Natural Materials
• Engineering Plastics

Sliding properties (slip properties) 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 replaced it. 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. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

Barrier properties (Barrier effect) Suppresses the permeation of gases and moisture through the tortuous path effect! Delays aging and provides anti-corrosion effects. It is used in marine coatings, films, adhesives, and interestingly, as a coating material for packaging fresh food. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• Paper and pulp products
• plastic

Vibration property Suppresses the transmission of vibrations. In vibration damping applications, the effect increases in proportion to weight and thickness, but mica has a high effect relative to the amount added. For the above reasons, it has become an indispensable filler for automotive parts where weight reduction is necessary. Please feel free to download for more details. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

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 everyday items 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. ↓↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

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 exhibits 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 achieved, which can enhance the fire resistance of paints and resins. Additionally, there are specially processed micas to further enhance their heat resistance. Please feel free to contact us. *The image shows data for "grade" and "percentage" during mica filling into PP. For more detailed information, please feel free to download. ↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

Rigidity (Bending Elasticity) Improves product strength and enables resistance to bending and twisting. Dimensional Stability Reduces shrinkage rate to prevent warping and cracking, and minimizes molding shrinkage to provide surface reinforcement effects. Mica balances molding shrinkage in both 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, sealing materials, adhesives, gasket materials, and friction materials. For more detailed information, feel free to download. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

Super Engineering Plastics (Super Empla) This refers to high-performance resins with 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. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

Plastics that are primarily used industrially. Compared to general-purpose plastics, they have superior mechanical strength and heat resistance, making them suitable for industrial components. The definition of engineering plastics (also known as "Enpla") is not very clear, but it is said to have: Tensile strength: 500 kgf/cm² (49 MPa) or more Flexural modulus: 20,000 kgf/cm² (1,960 MPa) or more Heat resistance: 100°C or more 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 "Nylon." PC (Polycarbonate) Polyester (PBT, PET) POM (Polyacetal): 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. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

The performance itself is not particularly high, but it refers to plastics (thermoplastic plastics) that are inexpensive and used/consumed in large quantities for everyday items. It features a relatively simple structure (composed only of a main chain of carbon), 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 mica, and is used as a filler in various resins. *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, adhesives, and more. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

I compared five representative inorganic fillers that are often heard of as comparisons 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. ↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

Explanation of the characteristics of Lepco mica. We welcome your requests for various applications, so please feel free to contact us. 【Main 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, mainly including muscovite (S grade) and phlogopite (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealing materials, adhesives, and more. Please feel free to download detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

Lepcomica = 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 ■ Vibration Damping ■ Corrosion Resistance ■ Weather Resistance ■ Barrier Properties ■ Insulation Properties ■ Lubricity (Slipperiness) (Sliding Properties) * We handle various sizes and grades of mica products, mainly including Muscovite (S grade) and Phlogopite (M grade). Mica has good compatibility with various materials such as plastic resins, paints, rubber, films, sealants, adhesives, and more. Feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• plastic
• Engineering Plastics
• Organic Natural Materials

The MagniF series magnetite is an environmentally friendly material as it is a naturally occurring mineral. The ferrimagnetic MagniF blended paint imparts properties that attract magnetic force to the painted area. Additionally, while it is a magnetic filler, it has superior rust resistance compared to iron powder-based fillers. Furthermore, since our products are natural rather than synthetic, it is possible to keep costs down. Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• magnet
• Engineering Plastics

The MagniF series magnetite is an environmentally friendly material as it is a naturally occurring mineral. With a specific gravity of 5.2g/cc, this high-density filler can increase 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 for more detailed information.

• Organic Natural Materials
• magnet
• Engineering Plastics

By combining "coloring × mica flakes × amount of addition," a wide range of colors can be expressed, from a dazzling luster to a sparkling sheen, adding vibrancy 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 color sensations ■ 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, primarily 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

"Magni F," a high-purity magnetite, is a naturally occurring ferrimagnetic mineral. 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 offering F grade for food packaging applications where compliance with hygiene standards is required. Its 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• magnet
• Other metal materials

The "Repkomica S Series" is a product made from natural mica that has been refined and crushed at a domestic factory. It maximizes the high elasticity inherent in natural 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. By being incorporated into industrial materials such as plastics, paints, and rubber, it is expected to provide 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. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• Other metal materials
• Engineering Plastics

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 effective for applications such as electronic components. When filled into industrial materials like plastics, paints, and rubber, it is expected to enhance and impart properties such as rigidity, dimensional stability, and heat resistance. 【Features】 ■ High whiteness allows for easy incorporation into products that require coloring ■ Excellent insulation resistance ■ Particularly high performance in applications such as electronic components ■ Expected to enhance and impart properties like rigidity, dimensional stability, and heat resistance ■ Flexible response to surface treatment and custom grade production ■ Short delivery times supported by domestic facilities

• Organic Natural Materials
• plastic
• Engineering Plastics

This document is a table of examples of applications for "mica" that our company handles. It categorizes resin, paint, 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 ■ Vibration Damping ■ Corrosion Resistance ■ Weather Resistance ■ Barrier Properties ■ Insulation ■ Lubricity (Slipperiness) Feel free to download the detailed content.

• Organic Natural Materials
• plastic
• Engineering Plastics

"Mica" is a mineral classified as a silicate aluminum compound. The mica products we handle are high-purity, high-quality, and high-aspect-ratio flake powders, and we have established a stable supply system centered around our domestic factory. We offer a wide range of grades with average particle sizes from several 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 ■ Non-toxic to humans and eco-friendly ■ High-purity, high-quality, high-aspect-ratio flake powders ■ A stable supply system centered around our domestic factory ■ Flexible responses tailored to customers' applications and requests Please feel free to download detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics

"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 numerous achievements as a flake filler and reinforcing material with the unique characteristics of mica. There are products like "Repromica S Grade," which is made from naturally occurring gold mica that has been refined and crushed, and "Repromica M Grade," which is made from refined and crushed white mica. 【Characteristics】 ■ 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 by layering ■ Barrier properties: Exhibits a labyrinth effect to prevent gas and moisture permeability ■ Insulation: Enables active use in electronic components ■ Lubricity: Allows for use in release agents and reduces wear on parts and molds Please feel free to download for more detailed information. 　　　　　　　　　↓↓↓↓↓↓↓

• Organic Natural Materials
• plastic
• Engineering Plastics