Air Bubble In Resin

Hi,

I'm making a display case for a mobile phone. I'm going to make a block of clear casting resin, inside will be the phone and beneath that a air bubble. Does anyone know how I could insert one?

Thanks Michael

Reply to
Himszy
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Try doing it WITHOUT the air bubble and you'll be bound to get one in there.

-- Regards,

John Stevenson Nottingham, England.

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Reply to
John Stevenson

You can get them from the same shops that sell spirit level bubbles ;-)

Regards, Tony

Reply to
Tony Jeffree

The problem now is one of supply. Before when you could buy a decent fat Northern bubble [ with rich accent ] all that available now are the import ones. Granted they are cheaper but the bubble is slanted.

-- Regards,

John Stevenson Nottingham, England.

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Reply to
John Stevenson

Reply to
Colin Jacobs

Sounds like a load of carp to me ;-)

Regards, Tony

Reply to
Tony Jeffree

They put jam in a donut with a syrine type tool. Put the bubble in with a syringe, may have to leave the syringe in place until the resin sets to seal air in.

Tinman

Reply to
tinman

I need one around 30mm

Reply to
Himszy

That'll be the McBubble then. ?1.99p with fries and soft drink.

Reply to
Michael Fudge

Hypodermic needle? At least, it'll push air in - I don't know how you'd stop the bubble from moving, unless you got the timing right with regard to the stiffness of the resin.

Regards,

Reply to
Stephen Howard

Two ideas that may help you, a clear glass ball, perhaps from one of the arts and craft stores the ladies like to visit. You would have to leave the ball in place of course but then hopefully the clear glass won't be detected. Other options of course would be a clear plastic ball of some sorts. The second idea while not as good may give you other ideas, would be a small latex balloon blown up to the approximate size needed. Once the resin has cured, use a needle to pop the balloon with something to pour in to melt the latex. On those lines I suppose you could make a ball of some material that could be washed out with either water or some chemical that would not react with the plastic.

Both items would have to be placed on a small clear plastic rod to prevent movement when making the pour or supended from the phone using fishing line.

Might want to experiment with some ideas before committing the phone and a large amount of resin to the project.

Good luck,

Rusty Bates

Himszy wrote:

Reply to
elf

In spite of all the excellent suggestions you have already received, (LOL), I'd like to offer another.

My first thought was to make a resin bubble in the same manner that large soap bubbles are made. But I doubt that the surface tension and timing would allow this approach. Then itg occurred to me that resin is similar to glass, in that, it can be worked as a plastic mass and then solidifies. So why not blow a resin bubble? Dip a straw into a batch of catalyzed resin and proceed to blow a bubble. You can usually feel the temperature change when a batch of resin "kicks", so you can probably get the timing for the cure pretty close. The rest is practice.

Just a thought.

Rick

Reply to
Dr. Spiff

I assume your are talking polyester casting?

I used to do this sort of casting all the time although usually I was trying to AVOID bubbles as I did embedments. This idea of blowing a bubble is one way to go but be prepared for MANY MANY failures until you get one right.

I would approach it from another direction:

Do a poured casting over a suitable polythene shape to get a 'shell' which your then place over your object (phone in this case) which you then cast into place. As the 'outer' surface is a tack surface you will get good bonding between layers and little trouble due to refractive shifts.

I don't know if you'll get it to work though because the plastics used in phones usually don't like the fumes from the styrene.

Reply to
Technicians

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