Section 2 Materials

201. Application

1. The hull, constructed in FRP, is to be in accordance with requirements in this section. The require- ments, not mentioned in this section, are to be in accordance with the Rules for the Classification of FRP Ships..

2. Reinforcement, matrix, fillers and core materials for major hull constructural elements are normally to be approved by Society.

3. The polyester containing wax or other material that deteriorate bonding are to be carried out inter- laminar shear strength test (KS M ISO 14130) and approved by the Society.

202. Equivalency

The type approval of FRP materials, not mentioned in this section, is in accordance with official standard. Alternative FRP material will be accepted by the Society, provided that the Society is sat- isfied that such material is equivalent to those required in this rules.

203. Application of materials

1. Grade 1 polyester is to be used for the hull shell laminate in single skin construction and for the outer hull skin laminate in sandwich construction.

2. The outer reinforcement ply of the outer hull skin laminate is to be at least 450 g m of chopped strand fibres containing as little water soluble bonding components as possible. Normally spray rov-

ing or powder bound mat should be used. Alternatively a 300 g m mat and a light surface

3. mat

can be used. Other material systems giving an equivalent surface protection may also be accepted.

Areas inside the hull expected to be continuously exposed to water submersion (i. e. bilge wells etc.) and the inside of tanks shall have a surface lining consisting of at least 600 g m

4. reinforce-

ment material.

The strength calculations are to be based on mechanical properties obtained from testing of repre-