Marine Plywood 1088 vs 6566 What is the truth?
Robert
are specifically in 3mm 1/8” Okoume plywood. I say specifically 3mm
1/8” because I have been informed by my Marine Plywood World Panel
Products dealer that 3mm doesn’t come in a BS1088 standard because the
face veneers are too thin and the melamine glue would bleed through,
so they use the phenolic glue instead, which is just as good but
doesn’t conform to the BS1088 standard? He also informed me that many
suppliers will stamp their 3mm 1/8” as BS1088 even though it isn’t
because it basically conforms to the spirit of the standard. The 3mm
is ink stamped "WISA COLLAGE 3-A 100. All the other sizes are ink
stamped MALVO-PLY Okoume BS1088 Made in France with a Sticker that
says Lloyd's Registered.
Noah’s Marine sent me this information which is totally different than
everything else I’ve been told.
“The only difference between the 6566 and 1088 is the face. The 1088
has
no voids in face, the 6566 has some. People use the 1088 if they are
going to do a clear finish, if you are going to paint the plywood i
would use the 6566,it's cheaper. That's the only difference between
the two.”
As I have read the BS6566 standard it allows for core gaps as shown
below and is not recommended for structural applications. However the
owner of World Panel Products says that his BS6566 is manufactured to
the BS1088 standard except for the glue. Does this make it
structural?
Can someone please straighten me out! I’ve never had so many
conflicting stories. Should I use the 6566 that World Panel Products
sold me or should I take it back and order BS1088 from another source?
Thanks Robert
These are what I have pieced together of the Standards.
6566 Marine bonded
Plywoods in this category in New Zealand are generally of a BC or
BB/CC grade. They are also known as exterior plywoods or WBP. The
standards that apply are generally BS6566 and AS2271. There are no
restrictions on the type of timber specie used and core gaps are
allowed. Generally used in boat building in non-structural areas.
Standard thicknesses are 4, 6, 9, 12, 15, 18, 25 mm. Sheets sizes are
2440 x 1220 mm and 2400 x 1200 mm. "
BS1088
Marine Plywoods manufactured to BS1088 must satisfy a number of
minimum requirements, of which the following is a brief summary:
1) All veneers, both internally and externally must be free from gaps,
all sapwood and natural defects.
2) Internal veneers must all be of a durable species and the same
quality as the face veneers.
3) The glue line must be WBP (Weather and Boil Proof), usually a
resorcinol resin. It must be resistant to attack by micro-organism,
cold and boiling water, steam and dry heat.
4) Genuine marine plywood should always be stamped with its country of
origin and ideally carry Lloyds certification and certification that
it is manufactured to BS1088.
Glenn Ashmore
sheets of meranti) from Noah's (Brunzeel) and Edensaw (Eidai/Israeli) over
the past 4 years from 3mm to 18mm and have never found a void. I did mu
first boat in 4 mm 1088 and except for the face veneer I can find no
difference. I have a pile of scrap sitting outside in the rain for all
that time and none of it has delaminated. In the same pile some US made
fir marine has fallen apart.
I would not worry about it.
Robert wrote:
--
Glenn Ashmore
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Riverockt
found one on a sponson deck after i had glued it down. Cant you get what you
pay for????
Keith
jmea...@netcomuk.co.uk
If you look at item 2 in your summary of BS1088 you will find the
nucleus of your answer:okoume, or as we call it in the country that
originated BS1088, is not regarded as a durable species.You may find
okoume ply that has been bonded to the same standard BS1203 ,if I recall
correctly, and that may be sufficient for your purposes.
John Meachen