Epoxy System for Open Mold Lamination

BioPoxy 36 is a two-component epoxy system developed for wet layup and wet bagging composite lamination. The system cures at room temperature and is suitable for manufacturing composite parts and non-critical structures.

BioPoxy 36 will wet out and bond to carbon fiber, fiberglass, and natural fibers. Used as directed with EcoPoxy GelCoat, BioPoxy 36 is part of a complete system for composite fabrication.

BioPoxy 36 is compatible with expanded polystyrene foam cores and suited to composite repairs, such as core bonding and lamination.

BioPoxy 36 Product Information

Mixing

BioPoxy® 36 is formulated to have a 4:1 resin to hardener mix ratio by volume. Deviation from the mix ratio can result in lower mechanical properties or incomplete cure.

Reactivity

BioPoxy® 36 is a thermosetting resin and will generate heat as it cures. Reactivity level is a qualitative indicator of the rate of reaction and temperature of the resin system’s cure. Gel time is the point at which the mixed resin gels or becomes so viscous that it can no longer be worked. Peak exotherm is the maximum temperature observed during cure, and Time to peak exotherm is the length of time between initial mixing and observation of the peak exotherm temperature. The reactivity of the resin system can be affected by factors such as part thickness, the temperature of resin and hardener before mixing, ambient conditions, and the ability of the mold to release heat.

Processing Characteristics

Working time is the time during which the resin has been mixed and can still be manipulated with a brush or roller.

Tacky to touch is the period where a second laminate schedule can be applied without the need to abrade the surface of the first layer for adhesion. After lightly touching the surface of the laminate, a glove print remains; resin does not stick to the glove and the surface does not significantly deform.

Set to touch is the point in time immediately after the tacky to touch period, where the surface of the laminate is tack-free. Using the same method as tacky to touch, no glove print should remain after lightly touching the surface of the laminate. Laminating a second schedule is not recommended without abrading the surface of the first layer.

Demolding time is the point in time at which the laminate has cured sufficiently such that the mold is no longer required to hold part’s shape. Laminates can be demolded when a wedge can be inserted under one corner of the laminate with no observable deformation once the wedge is removed.

Full cure is the point in time when the laminate achieves full mechanical properties.

The table below shows Working Time, Tacky to Touch, Set to Touch, Demolding Time and Full Cure for a 11” x 11” x 1/8” thick laminate. Processing characteristics will vary depending on factors such as part thickness, part geometry, ambient conditions, and mold materials.

Storage

Store in a cool, dry, well-ventilated location out of direct sunlight. Protect from freezing and physical damage. Do not store in a location subject to frequent temperature changes as the product may crystallize. Use product as soon as possible after opening. If storing remainder of product for another project, keep container tightly closed.

Safety

Consult Safety Data Sheet (SDS) before use. Wear protective gloves, clothing and eye/face protection. Use only in well ventilated areas. Avoid contact with the skin and eyes. Take off contaminated clothing and wash before reuse. Keep containers tightly sealed when not in use. Avoid breathing dust, vapors and fumes. Wash hands thoroughly after handling. During post-finishing wear proper PPE and avoid dust. When fully cured, BioPoxy® 36 is an inert plastic.