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Rilsan Polyamide Tubing: How to heat bend?

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norriedh

Joined: 22 Jun 2006
Posts: 6
Location: Calgary, Canada

Posted: Fri Jun 30, 2006 8:29 am Post subject: Rilsan Polyamide Tubing: How to heat bend?

Anyone know how to heat bend Rilsan Polyamide tubing? I want to take the strain off a bend --- am using this tubing for a Visual Fuel Indicator ('gauge glass'). Rilsan is the trade name for Arkema made polyamide -- their website indicates the tubing can be "thermoformed for small bend radii" for brake tubes etc -- but no info on how to do. The melting point is about 180 deg C so a heat gun would need careful use. Maybe boiling water (100 deg C) would do?



Thanks   Douglas N

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dredmoody(at)cox.net
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Posted: Fri Jun 30, 2006 10:25 am Post subject: Rilsan Polyamide Tubing: How to heat bend?

No experience with Rilsan but I have made many bends in Plexiglas using a heat gun and had no problems at all. Do you have some waste material to experiment on?



Ed Moody II



---- norriedh <norried(at)shaw.ca> wrote: 

 	  Quote: 	
		   

 

 Anyone know how to heat bend Rilsan Polyamide tubing? I want to take the strain off a bend --- am using this tubing for a Visual Fuel Indicator ('gauge glass'). Rilsan is the trade name for Arkema made polyamide -- their website indicates the tubing can be "thermoformed for small bend radii" for brake tubes etc -- but no info on how to do. The melting point is about 180 deg C so a heat gun would need careful use. Maybe boiling water (100 deg C) would do?

 

 Thanks   Douglas N

 

 

 

 

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norriedh

Joined: 22 Jun 2006
Posts: 6
Location: Calgary, Canada

Posted: Sat Jul 08, 2006 7:21 pm Post subject: Re: Rilsan Polyamide Tubing: How to heat bend?

Here's how: Rilsan is one of the group of plastics commonly called

Nylon, composed of polyamides. The different variants of Nylon have

generally similar characteristics, but each has some particular

characteristic extended for an application. Rilsan is the trade name

of a nylon well suited for tubing. It can be hot bent by heating with

a heat gun. Boiling water (100 C) is not hot enough I found, but the

melting point is around 180 C so a low heat gun setting is needed. Two

tips are: use a bending jig that contrains the sides of the tube from

moving out and the tube flattening and use a piece of wooden dowel

(sanded down to fit snugly) inside the open end to stop it changing

shape and also for leverage. So heat the tube in the area of the bend,

put it into the jig, bend and hold till cool. Some springback occurs

so repeat as needed to get the bend required.



A bending jig can be just a groove filed circumferentially around the

corner of a board. 



Douglas N

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