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Cutting Divinycell HCP for a Float

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Sep 20, 2016
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Hi everyone,

I’m taking some time to comb through my bluewater rig. I want to move from my current dual high pressure inflatables to a solid float trailed by a high pressure inflatable

I’ve got a design and dimensions that I want to work with, and am fairly narrowed-in on my material. I’m looking at using Divinycell HCP50 or H250 (both 15.6 lb foam) due to their resistance to compression and durability; the latter of which could allow me to toss the float into a check-in duffel bag without worry of the float getting destroyed by the airlines (at least, from what I’m told!)

I’ve never worked with this material before so I wanted to see if you all have any insights. How hard is it to cut and sand to a final form? How would you recommend shaping HCP50/H250?
 

Diving Gecko

shooter & shooter
Jun 24, 2008
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Hacksaw blades and sandpaper (on boards, dowels and in hand) works great. Are you going to cover it with fiberglass?


Sent from my iPhone using Tapatalk
 
Sep 20, 2016
3
1
13
25
Hacksaw blades and sandpaper (on boards, dowels and in hand) works great. Are you going to cover it with fiberglass?


Sent from my iPhone using Tapatalk

A big reason I was hoping to go the Divinycell HCP50 or H250 route was to avoid fiberglassing the float. My main fear is in a glassed float getting damaged by the airlines in a large, soft, checked-in duffel bag while traveling. At least to my knowledge, the 15.6+ lb/ft^3 PVC foam is tough enough to handle that level of abuse (this line of thinking is based upon this thread: https://forums.deeperblue.com/threads/divinycell-floats.64916/post-582825. Please correct me if I'm wrong! Again, I've never worked with this high of density PVC foam before)

Hence why I was concerned about the cutability and workability of the material: if HCP50/H250 is so tough, I have concerns on how to go about cutting it. But you believe that something as simple as a hacksaw and sandpaper should do the trick?
 
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Andrew the fish

Well-Known Member
Oct 17, 2010
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I used to deal with high-density foam back in a days when I was more into RC planes. Keep in mind that foam may be hard and heavy, and resist compression, but may not be able to handle the stress at the attachment point of your float line. You pretty much need to encase it in fiberglass, unless float line will be more of a feed through with large washer at the other end. This will change the load from tensile stress, which foam can't handle, into compression.
 
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