Splitting styrene tubing?

[tbone]

I'm looking for a good way to split styrene tubing.
I want to split it lengthwise but can't find a way of doing it straight; being tubing the blade wants to slide off one side or the other.

Anyone have ideas?

[west coast tug]

Try drilling a hole in to a block and guiding 2 sharp blades or 1 through the block at the end , A low for material expansion at the blade . It all depends on how straight you can pull it.
The other way that I use is a  wood joint-er , tape them to a board and shove them across with multiple pass's to the thickness you want , Yes you are going to loose a side .
If its the shape you want just get the solid styrene shapes that are pre made.
Gary

[tbone]

Thanks, I'll try that.
What I need is the tube cut open to fit over something.

[Model Tug Man]

A Dremel tool with a cutting wheel will perform the task you want fairly well. Draw a line on the tube to follow.

[2tugboats]

Just yesterday I was trying to figure out the same situation with cutting
black rubber heater hose to fit my tugboat's bow push bars. Couldn't get
a straight cut.

A friend watching me said, "Why don't you just slide a piece of round
doweling or a rake handle or something into the hose and then you can
clamp in down and, tracing a straight edge, make a good cut.

Well, I just happened to have a piece of round hardwood stock and the
hose slid on perfectly. Using a brand new, a sharp blade is a must for straight,
I was able to a get pretty good edge. I used sand paper to split the difference.

The other suggestions all work to, TBone. . .Michael in Anacortes, Washington

[tugs53]

You could try putting some acetalene gas in the tube...tape up the ends, then attach a fuse...and light it......hehehehe

[Model Tug Man]

I like Mike's suggestion.

[tbone]

I used the method of drilling a hold in a block of wood, clamping a blade in and pulling it through.  It worked well for what I needed.

Thanks for all the suggestions.