Re: urethanes for living hinges, PP or PE simulation

From: Michael Tsenter (nest@primenet.com)
Date: Mon Aug 10 1998 - 20:59:56 EEST

We have a semi-rigid polyurethane system for simulation of polypropelene
or polyethylene type components. This product is well suited for
production of living hinges and other flexible parts with high
hardness. The following table outlines basic mechanical properties:

TYPICAL CURED SYSTEM PROPERTIES for PC99VS/G31VS

Density ASTM (D 792) g/ml 1.15 - 1.20
Shore Hardness @ 0° F 73-76 D
                @ 77° F 63-66 D
                @ 140° F 61-64 D
                @ 212° F 61-64 D

Linear shrinkage (silicone mold @ 140° F) % 0.15 - 0.35
Max. recommended operating temperature ° F 212
Flexural strength ASTM (D 790) psi 2,800 - 3,200
Flexural elastic modulus ASTM (D 790) psi 55,000 - 58,000
Tensile strength ASTM (D 638) psi 2,800 - 3,200
Elongation ASTM (D 638) % 210 - 230

Feel free to contact me with any questions.

Sincerely,
Michael Tsenter 

-- 
CAMATTINI - North America
a division of NEST Technologies
3849 Ridgemoor Drive
Studio City, California 91604

Tel: 	818-761-6500	
Fax:	818-761-6116
e-mail:		nest@primenet.com
web site:	http://www.primenet.com/~nest/

pablo elenter wrote:
> 
> Dear lists,
> 
> I am looking an urethane for casting "flip-top" caps, like the ones used in
> shampoos, etc., in order to make a functional part with a living hinge.
> 
> Any experience with living hinges in urethanes?
>

For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/

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