OPTOLINQ TMC-2100H | Transparent Mold Compound

Harmonization Code : 3907.30.00.90 | Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other

OPTOLINQ TMC-2100H | Transparent Mold Compound

Main features

Optimal spiral flow
Low moisture absorption
Superior moldability and reliability

Product Description

OPTOLINQ TMC-2100H is an optically clear epoxy molding compound specifically designed for the encapsulation of applications that demand high moldability and optical performance. Its optimized wax formulation delivers improved self-release, enabling easier demolding and better cavity fill.

OPTOLINQ TMC-2100H exhibits excellent resistance to moisture and retains stable performance under high heat and humidity. With superior processability and long-term reliability, it ensures consistent quality and precision in optoelectronic device packaging.

TMC-2100H is compatible for both emitter and receiver functionality for IR-sensitive applications, where it effectively blocks near-infrared (NIR) light above 1100 nm while allowing visible light (400–700 nm) to pass—making it well-suited for ambient light sensors and other visible-light-only applications.

OPTOLINQ TMC-2100H comes in different sizes to meet various mold design requirements. Contact us for custom sizes or other specific requirements.

Key Features

Visible Light Transmission with NIR Blocking: Enables precise sensing by allowing visible light through while filtering out NIR wavelengths (>1100 nm).
Low Moisture Absorption & High Resistance: Protects device performance and longevity under damp or humid operating environments.
Reliable Under Harsh Conditions: Maintains physical and optical properties at elevated temperatures and high humidity.
Low Stress with High Adhesion: Reduces risk of cracking, warpage, or delamination in optoelectronic assemblies.

Typical Applications

Ambient light sensors
Proximity/photodiode receivers (visible to ~1100 nm)
Optical windows/covers for modules and cameras
Low-power visible LEDs and indicators
Data communication modules requiring clear optics

Versions Available

Standard Low stress optical molding compound - TMC-2100
Enhanced self-release, visible-pass with NIR filtering (>1100 nm) - TMC-2100H
Superior IR optical transparency - TMC-2100IR

Alternative to: XX-8524 Series, XX-824H, XX-330H

Specifications
Additional Information

Technical Specifications

General Properties

Specific Gravity

Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.

1.2-1.25

Physical Properties

Spiral Flow @ 175°C

80-180 cm

Mechanical Properties

Hardness Hardness Hardness is a dimensionless quantity. There is no direct relationship between measurements in one scale and their equivalent in another scale or another hardness test.
Durometer (Shore D)	80

Flexural Modulus
Flexural Modulus @ 25°C	2,600-3,400 N/mm2

Flexural Strength
Flexural Strength @ 25°C Flexural Strength @ 25°C Flexural strength, also known as modulus of rupture, or bend strength, or transverse rupture strength is a material property, defined as the stress in a material just before it yields in a flexure test. This is the flexural strength tested at Room Temperature, 25°C	110 N/mm2

Molded Shrinkage

1.5 %

Thermal Properties

Coefficient of Thermal Expansion (CTE) Coefficient of Thermal Expansion (CTE) CTE (Coefficient of thermal expansion) is a material property that is indicative of the extent to which a material expands with a change in temperature. This can be a change in length, area or volume, depending on the material. Knowing the CTE of the layers is helpful in analyzing stresses that might occur when a system consists of an adhesive plus some other solid component.
Coefficient of Thermal Expansion (CTE) , α1 Coefficient of Thermal Expansion (CTE) , α1 CTE α1 (alpha 1) is the slope of the Coefficient of thermal expansion in a temperature range below the Glass transition temperature (Tg). It explains how much a material will expand until it reaches Tg.	6-10 ppm/°C
Coefficient of Thermal Expansion (CTE), α2 Coefficient of Thermal Expansion (CTE), α2 CTE α2 (alpha 2) is the slope of the Coefficient of thermal expansion in a temperature range above the Glass transition temperature (Tg). It explains the extent to which a material will expand after it passes Tg.	17-21 ppm/°C

Gel Time Gel Time Gel time is the time it takes for a material to reach such a high viscosity (gel like) that it is no longer workable. It is usually measured for different temperature conditions and even though it does not refer to full cure it is advisable to never move or manipulate the material after it reached its gel time since it can lose its desired end properties.
Gel time @ 150°C	35-60 Sec

Glass Transition Temperature (Tg)

Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding.

The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.

110-130 °C

Curing Conditions

Curing Schedule

Curing Schedule
Curing schedule is the time and temperature required for a mixed material to fully cure. While this applies to materials that cure with heat, there are also other materials that can be cured with UV.

Even though some materials can cure on ambient temperatures, others will require elevated temperature conditions to properly cure.

There are various curing schedules depending on the material type and application. For heat curing, the most common ones are Snap cure, Low temperature cure, Step cure and Staged cure.

Recommended cure type, schedule, time and temperature can always be found on the Technical data sheets.

Cure Time

2.5-4 min

Transfer Time

40-60 s

Additional Information

OPTOLINQ TMC-2100H Additional Technical Specifications

Property	Value	Unit
Transmittance at 400nm	85	%
Preheat Temperature	75-95	℃
Molding Temperature	165±10	℃
Molding Pressure	3-8	MPa
Post Cure Time @165℃	3-4	hours

Featured BMC-4200H Variants: CAPLINQ Product Offerings

BMC-4200H Optically Clear EMC with Filters

OPTOLINQ BMC for Filter Applications

Looking to enhance optical precision and durability in your filter-integrated optoelectronic devices? This short presentation introduces OPTOLINQ’s optical molding compounds specifically designed for high-performance filter applications.

Featuring BMC-4200H, a versatile formulation available in six onset wavelengths (700, 720, 750, 820, 840, and 870 nm), our optical compounds offer exceptional light control, environmental resistance, and long-term optical clarity.

Whether you're fine-tuning signal filtering, improving IR sensitivity, or ensuring high transmission and structural stability, OPTOLINQ compounds are built to perform—consistent, and reliable.

Got questions or need help selecting the right optical grade for your filter applications? Reach out to us!

Directions Before Use

Thaw TMC-2100H to room temperature (20±5℃, 40±15%RH) at least 24 hours before use. Do not open the bag to avoid moisture contamination.
Slowly preheat the molding compound using standard RF equipment.