Product Overview & Key Features
Manufacturer: Kumho
Material Category: SAN (Styrene-Acrylonitrile Copolymer)
Physical Appearance: Transparent natural pellets, clean and uniform particles, possessing stable light transmission performance, suitable for injection molding processes.
Kumho 310CTR is a general-purpose transparent SAN resin featuring two sets of melt flow rate indexes to accommodate different injection molding process tuning requirements. The material exhibits high rigidity and hardness, a stable mold shrinkage rate range, and good heat resistance, with a flame retardant rating of UL94 HB (1.6mm). This grade can be processed via injection molding and is widely used in various transparent exterior parts, instrument windows, home appliances, and consumer electronics structural components, meeting mass production and manufacturing demands across multiple industries.
Technical Specifications
Physical Properties
| Test Item | Test Condition | Property Value | Unit | Test Method |
| Water Absorption | 24hr | 0.3 | % | ASTM D570 |
| Melt Flow Rate (MFR) | 230℃/3.8kg | 10 | g/10 min | ASTM D1238 |
| Melt Flow Rate (MFR) | 200℃/5kg | 5.5 | g/10 min | ASTM D1238 |
| Density | — | 1.07 | g/cm³ | ASTM D792 |
| Mold Shrinkage | Flow | 0.2 to 0.6 | % | ASTM D955 |
Mechanical Properties
| Test Item | Test Condition | Property Value | Unit | Test Method |
| Rockwell Hardness | — | 82 | — | ASTM D785 |
| Flexural Modulus | — | 3360 | MPa | ASTM D790 |
| Tensile Strength | — | 62 | MPa | ASTM D638 |
| Charpy Notched Impact Strength | 3.2mm | 1.5 | J/m | ASTM D256 |
| Elongation at Break | — | 4.5 | % | ASTM D638 |
| Flexural Strength | — | 90 | MPa | ASTM D790 |
Thermal Properties
| Test Item | Test Condition | Property Value | Unit | Test Method |
| Heat Distortion Temperature | 18.6kg/cm², unannealed | 90 | ℃ | ASTM D648 |
| Vicat Softening Point | 1kg, 50℃/h | 107 | ℃ | ASTM D1525 |
Flame Retardant Performance
| Test Item | Test Condition | Property Value | Unit | Test Method |
| Flammability | 1.6mm | HB | — | UL 94 |
Disclaimer: The technical specifications for Kumho 310CTR SAN presented herein are derived from data issued by Kumho or certified third-party testing institutions. While we have made every effort to ensure the accuracy of the information provided, we assume no liability for any consequences arising from the use of Kumho 310CTR SAN based on these data. Given the variables involved in processing conditions, we strongly recommend conducting thorough trials of Kumho 310CTR SAN under your specific operational environment prior to final material selection.
Applications & Processing Guidelines
Recommended Application Scenarios
- Consumer Electronics: Transparent observation windows for equipment, indicator light housings, instrument panels, and transparent functional buttons.
- Home Appliance Industry: Transparent decorative covers for small appliances, air purifiers, and air conditioner transparent accessories.
- Daily Consumer Goods: Transparent containers, cosmetic cases, and various transparent decorative items.
- Industrial Accessories: Small instrument windows, transparent protective housings, and other rigid transparent components used indoors.
Processing Operation Essentials
- Raw Material Drying: SAN materials have a certain water absorption rate and are recommended to be dried prior to processing to prevent defects such as silver streaks, bubbles, and light transmission flaws in products.
- Melt Flow Rate: This grade provides two sets of MFR test data. Under 230℃/3.8kg conditions, the MFR is 10.0 g/10min, showing moderate fluidity to satisfy conventional injection molding. Mold designs can reference a 0.2 to 0.6% molding shrinkage rate to reserve tolerances.
- Molding Temperature: Processing temperature ranges reference general SAN injection molding temperature ranges. Gradually adjust barrel and mold temperatures during debugging, control the shear rate, reduce internal stress, and prevent product cracking.
- Post-Processing: Molded transparent parts are recommended to cool slowly to reduce internal stress and enhance the chemical/solvent resistance of the finished product.
Logistics, Packaging & Compliance
- Packaging Specifications: 25kg moisture-proof sealed bag packaging with a built-in moisture-proof protective film to prevent particle moisture absorption.
- Hazardous Chemical Attribute: This product does not belong to hazardous chemicals and can be arranged for sea and land transportation like ordinary plastic pellets, supporting LCL (less than container load) and FCL (full container load) exports.
- Delivery Lead Time: Conventional inventory order delivery lead times are stable, supporting long-term bulk supply.
- Compliance Documents: Original factory quality inspection documents including TDS, MSDS, and COA can be provided. The material meets international environmental regulations such as REACH and RoHS, and can be used for overseas export factory audits and product certifications.
- Environmental Description: The material is recyclable, and pollutant emissions are controlled during the production process, meeting manufacturing ESG-related requirements.
Frequently Asked Questions (FAQs)
Q1: Must Kumho 310CTR SAN raw materials be dried before processing?
A: This material has a 24-hour water absorption rate of 0.3% and will absorb moisture when exposed to the air. Drying is recommended prior to injection molding, as excessive moisture can cause silver streaks, bubbles, and surface flaws on transparent parts, impacting product appearance and mechanical performance.
Q2: How should the two sets of melt index parameters be referenced during material selection and processing?
A: The two sets of MFR adopt different test conditions. 230℃/3.8kg is a commonly used test condition in the SAN industry, primarily used for molding fluidity evaluation; 200℃/5kg is used for referencing material flow characteristics under low-temperature operating conditions. Mold and process debugging should preferentially reference the MFR value at 230℃/3.8kg.
Q3: Can Kumho 310CTR SAN be used for long-term outdoor products?
A: This grade is a general-purpose SAN with no extra weathering modification, and long-term outdoor sun exposure is not recommended. Yellowing and performance degradation will occur under long-term ultraviolet environments, making it more suitable for transparent components used indoors.
Q4: What does the UL94 HB rating of this grade mean?
A: UL94 HB is the horizontal burning rating, and 1.6mm specimens reaching the HB level indicate that the material possesses basic flame-retardant properties belonging to the slow-burning category. It cannot be used as a high flame-retardant component, so please confirm terminal product flame retardant specifications prior to material selection.
