Epoxy resin systems
|Publication Date:||1 March 2016|
This CP gives a description of the procedures and requirements related to documentation, design and type testing applicable for TA of epoxy resin systems.
This CP does not set the design requirements to the Epoxy resin systems. TA is based on compliance with design requirements given in the DNV GL rules and standards. The CP describes how to document compliance with the requirements in order to obtain a TA certificate for the equipment. This includes, where relevant, technical requirements for how the type tests shall be performed.
An epoxy resin system is in the context of this class programme defined as: "Cured, non-reinforced, 2- component material based on a specified epoxy resin (modified or non-modified A component) cross-linked by a specified curing agent (B component, based on amine, amide, etc.)".
The above definition implies that the type approved system may represent an intermediate and not final product, e.g. the epoxy matrix material only in a fibre reinforced, laminate product (not the final laminate).
This class programme for epoxy resin systems includes optional requirements for fire retardant materials for use in lifeboats, see Sec.2 [4.3].
A DNV GL type approval certificate will be valid for one grade or quality of the actual product with the possibility to include variants.
For epoxy resin systems this means:
Grade: One base resin (A component) with one curing agent (B component).
Variants: Modifications within a grade as defined above with different viscosity, pot life, curing time, etc. All variants shall fulfil the requirement to the same grade.
The following properties will be printed in the certificate:
heat deflection or glass transition temperature
curing procedure used for type testing.
Deviation from the requirements will be stated in the certificate.
A DNV GL type approval certificate is normally limited to one manufacturer at one production site, however, other arrangements may be agreed with the Society.
Type tests as specified in Sec.2 , shall be carried out and verified in one of the following ways:
at a DNV GL laboratory
at a recognized and independent laboratory or a laboratory accepted by DNV GL
at the manufacturer's premises in the presence of a surveyor.