jul 5, 2016 in Composites

When outer structures like ship hulls and vehicle body panels are made in composites, the question of impact performance comes front and centre.

When using Soric® instead of continuous fibre mat (CFM) to bulk up such a structure you save up to 30% on resin and the total impact energy that the laminate can absorb remains the same. The key is choosing a compact fibre layer with a high fibre volume and relying on Soric® to compensate the loss of thickness.

Soric Gelcoat

Example of how Soric® can be used to optimize a laminate

soric impact resistance

Source: University of Twente, 2007


In addition to saving on resin costs the Soric® improves on the failure mechanic, following a very favorable middle road between the traditional failure mechanics of full fibre laminates and sandwich constructions.

soric impact characteristics

Classic failure mechanics of composites, Source: Tien-Wei, S.; Yu-Hao, P. Impact resistance and damage characteristics of composite laminates. Compos. Struct 2003, 62, 193–203. Soric® has a more favorable mechanism, combining the best of both full laminates and sandwich structures.


The honeycomb structure of resin formed in the Soric® gives high mechanical properties for a core material. This, combined with the Soric® itself giving way to deformation, absorbs all impact energy. This prevents delamination and breaking of the glass fibre plies. The only failure mechanic is matrix cracks.

Soric resin

Laminate with gelcoat, glass fibre chopped strand mat, Soric® TF, glass fibre multiaxial, Soric® XF, glass fibre multiaxial and polyester resin. Impact with 67 Joule on a 5mm diameter tapered point.


Even after a substantial impact, a laminate with Soric® will keep fibre layers intact and bonded. This prevents water or other unwanted substances from penetrating the lay-up and degrading the composite from the inside out.

Lantor Soric® has Lloyds Type Approval for use in construction of special service craft including Yachts.