What grade of chopped strand matt should i use to create a sub box?

What grade of chopped strand mat should i use to create a sub box?

General purpose Polyester rosin and 450g CSM Chopped strand mat is normal, then seal with Flowcoat, this can be as you have said gelcoat with wax. Im busy doing a vicinity on this at the minute and that i can have it done shortly i hope, virtually a step by step guide to fiberglass sub box builds. keep tuned!

What are the request for resins, gelcoats and mattings to satisfy Lloyds approval?

Lloyds set a variety of minimum properties for gelcoat base resins and laminating resins - they conjointly set limits on additions, like fillers and pigments. makers got to totally take a look at the resins on a daily basis, and Lloyds will ask for proof of the check results. Minimum properties for solid gelcoat resins Water absorption - 70mg maximum Elongation at most stress - a pair of.5% min strength at most stress - forty N/ per sq. millimetre min Flexural Strength - 70N / per sq. millimetre Barcol - as fixed for full cure Gelcoats should have a most inorganic content of eighteen - this kind of covers thixotropes , pigments, any fillers etc. Minimum properties of laminating resins once in solid type. Water absorption - seventy mg maximum Elongation at most stress - 2 hundredth min strength at most stress - forty N / per sq. millimetre min Barcol - as fixed for full cure Temperature of deflection beneath load - fifty five deg C min sliced strand mat laminate minimum needs. The values amendment with glass content except for a typical glass content for sliced strand mat laminate ( half-hour glass by weight ) ,the following minimum values area unit fixed. strength - ninety MPa Tensile Modulus - 6.85 GPA Flexural Strength - 159MPa Flexural Modulus - five.7GPa. Compressive strength - 117MPa Compressive Modulus - 6GPa Water absorption - 70mg maximum.