Optically Brightened Laminating Epoxy

Optically Brightened Laminating Epoxy is a clear, UV-stabilized two-part epoxy system designed for white surfboard lamination and hot coating. Marjan Polymer Industries supplies the Entropy Resins BRT system in Pakistan with application review, compatible hardener selection and handling guidance.

Product Identity

BRT is an optically brightened version of Entropy Resins’ clear laminating chemistry. It is formulated to improve the visual brightness of white substrates while providing the wet-out, air release and working characteristics needed for hand lamination and coating. The optical effect is intentional: it should be tested before use on coloured surfaces, visible carbon or natural fibres where a colour shift may be undesirable.

System Components

• Resin: Entropy Resins BRT Optically Brightened Laminating Epoxy Resin.
• Compatible hardeners: CLX Extra Fast, CLF Fast and CLS Slow from the CLR hardener family.
• Mixing: two parts resin to one part hardener by volume for all three combinations.
• Supply: resin and selected hardener must be quoted as a complete, correctly proportioned system.

Published Processing Data

Values are manufacturer-published typical data, not a substitute for batch documentation or customer qualification. Pot life and cure response change with mass, geometry and ambient conditions.

Key Characteristics

• optically brightened appearance for white surfboard foam and white substrates;
• clear, UV-stabilized laminating and hot-coating chemistry;
• choice of extra-fast, fast or slow hardener for different working windows;
• low-colour finish and controlled air release for professional hand lay-up;
• approximately 30% biobased content in the published BRT formulation;
• compatible system approach using the specified Entropy CLR hardeners.

Recommended Applications

• white surfboard, paddleboard and board lamination;
• hot coating over compatible white composite constructions;
• white fibreglass components where enhanced brightness is desired;
• small composite, coating and repair work after substrate testing.

BRT should not be presented as a universal optical resin. For transparent laminates, coloured artwork or visible carbon fibre, a non-brightened clear laminating grade may give a more predictable colour.

Hardener Selection

Choose hardener speed against workshop temperature, laminate area, batch size and operator time. Extra-fast hardener is suited to small work and controlled cool conditions; fast hardener provides a shorter general-purpose window; slow hardener supports larger laminations and warmer conditions. Mixed hardener strategies should only follow the manufacturer’s instructions.

Application Method

1. Condition resin, hardener, reinforcement and substrate to a stable workshop temperature.
2. Confirm the surface is clean, dry and compatible; perform a colour and adhesion trial on representative material.
3. Measure resin and the chosen hardener accurately by the published weight or volume ratio.
4. Mix thoroughly, scraping the sides and bottom without excessive air entrainment.
5. Apply by controlled hand lay-up or hot-coating technique within the usable working time.
6. Maintain the specified cure environment and protect the surface from contamination.
7. Allow the full cure or complete the approved post-cure before final service or testing.

Quality and Process Controls

Record product code, batch number, resin/hardener weights, ambient temperature, mix time, start and finish time and cure conditions. A production qualification should confirm colour, fibre wet-out, surface quality, tack-free time, hardness, adhesion and any required mechanical properties on the customer’s actual substrate and reinforcement.

Storage and Safety

Store sealed containers under the temperature and shelf-life conditions stated on the current technical data sheet. Prevent contamination between resin and hardener. Use gloves, eye protection and appropriate ventilation, and consult the current safety data sheets before handling. Cure exotherm increases with mixed mass; prepare only a batch size that can be applied safely within the working time.

Ordering in Pakistan

For a quotation, provide the application, white substrate or foam type, reinforcement, coating or lamination area, workshop temperature, preferred hardener speed, required pack size and delivery city. MPI will confirm the BRT resin, compatible hardener, commercial availability, current documentation and lead time.

Frequently Asked Questions