Epotek 302-3M Black is a two-part epoxy that cures at room temperature and has an opaque black finish. It offers the same strength and moisture resistance as the standard Epotek 302-3M. However, the black pigment adds one key benefit. It blocks light completely.

Why choose Epotek 302-3M Black?

Light leaks can ruin the accuracy of an optical sensor. For this reason, many engineers use a black epoxy to shield sensitive parts. This grade stops stray light from reaching the detector. As a result, your readings stay clean and consistent.

The opaque finish also hides circuitry from view. Therefore, it works well for security potting, where you want to stop others from copying your design. In addition, it gives strong electrical insulation, with a volume resistivity of 1×10¹³ Ω·cm.

Key features

• Opaque black pigment for full light blocking
• Room temperature cure with low stress on parts
• Excellent moisture barrier
• High electrical insulation
• Strong bond to a wide range of substrates

Common uses for Epotek 302-3M Black

This epoxy suits many high-reliability products. For example, it is popular in:

• Optoelectronics and fibre optic assemblies
• Medical devices that rely on accurate sensors
• Security potting for sensitive electronics
• Light shielding around LEDs and photodiodes

Because it cures at room temperature, you do not need an oven. This makes it a good fit for heat-sensitive parts. It also keeps your production process simple.

How to use it

First, mix Part A and Part B together until the colour is even. Next, apply the epoxy to clean, dry surfaces. Then let it cure fully at room temperature before you handle the part. Always check the datasheet for exact mix ratios and cure times.

Need help choosing an adhesive?

OnBoard Solutions supplies Epotek adhesives to manufacturers across Australia. You can browse our full adhesives range or compare other optical adhesives. Alternatively, contact our team to order Epotek 302-3M Black today. We will help you find the right product for your application.