OPTOLINQ TMC-688L | Transparent Mold Compound
Harmonization Code : 3907.30.00.85 | Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other
Main features
- Low lumen decay
- Superior moldability and reliability
- For low stress molding applications
Product Description
OPTOLINQ™ TMC-688L is an optically clear epoxy molding compound specifically designed for the encapsulation of applications that require low lumen decay and low-stress molding. Its low modulus and reduced glass transition temperature (Tg) ensure reliable performance in environments with moderate temperature demands.
OPTOLINQ™ TMC-688L offers excellent moisture resistance, maintaining performance even in high temperature and humidity conditions. TMC-688L stands out with its superior moldability and reliability, ensuring high quality and precision in optoelectronic device molding. A variant of TMC-688L is also available with a higher modulus associated with an elevated glass transition temperature.
OPTOLINQ TMC-688L comes in different sizes to meet various mold design requirements. Contact us for custom sizes or other specific requirements.
Key Features
- Low Modulus: The low modulus of TMC-688L reduces mechanical stress on delicate components, preventing damage and improving device longevity.
- Low Moisture Absorption & Excellent Moisture Resistance: Effectively prevents moisture ingress, safeguarding long-term reliability.
- Reliable Under Harsh Conditions: Maintains consistent performance in environments with elevated temperature and humidity.
- High Adhesion & Low Stress: Provides strong, durable bonding with minimal internal stress, reducing the risk of delamination or cracking.
Typical Applications
- LED indicative devices
- In/outdoor Display
- Backlight Source
- White light products
Versions Available
- Standard low modulus optical molding compound - TMC-688L
- High glass transition temperature - TMC-688H
Alternative to: XX-830 Series, XX-831 series
TMC-688L
Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.
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TDS, SDS & Technical Documents
- TDS_OPTOLINQ TMC-688L
Technical Specifications
General Properties
Thermal Properties
Mechanical Properties
Curing Conditions
Physical Properties
Additional Information
OPTOLINQ TMC-688L Series Technical Specifications
| Property | Unit | TMC-688H | TMC-688L |
| Transmittance at 400 nm (1 mm) | % | >85 | >85 |
| Pellet Color | – | White | White |
| Specific gravity | – | 1.25–1.3 | 1.25–1.3 |
| Spiral flow at 150 °C | cm | 170 ± 70 | 170 ± 70 |
| Glass transition temperature (Tg) | °C | >145 | >115 |
| Coefficient of thermal expansion, α1 | ppm/°C | 60 ± 20 | 75 ± 25 |
| Coefficient of thermal expansion, α2 | ppm/°C | 180 ± 20 | 190 ± 20 |
| Gel time at 150 °C | s | 25–60 | 25–60 |
| Mold Shrinkage | % | <1.5 | <1.5 |
| Flexural strength | MPa | >120 | >120 |
| Flexural modulus | GPa | 3.55 ± 0.25 | 3.05 ± 0.15 |
Processing Instructions
- Before use, allow TMC-688L to reach room temperature (20±5 °C, 40±15% RH) for a minimum of 24 hours for larger pellets and 12 hours for smaller ones, ensuring the bag remains unopened to prevent moisture contamination.
- For TMC-688L in larger sizes, preheating can be performed using standard RF equipment. Preheating must be done slowly to achieve uniform temperature.
- Apply an outer releasing agent, such as silicones or fluorinated compounds, to the mold surface to facilitate easy release from the mold dies.
- Prior to molding with TMC-688L or any new material, the mold should be cleaned thoroughly. To prepare the mold, the initial three shots should be cured for 5–10 minutes. After this initial preparation period, you can reduce the curing time to a level that provides sufficient hot hardness for effective release.
Storage and Handling
OPTOLINQ TMC-688L is available in pressed pellets in a wide range of sizes to meet specific customer needs. To ensure product integrity, keep it away from oxidizing materials. For long-term storage, maintain a cold environment, ideally at –10°C or lower. The shelf life under this condition is 6 months.
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