Antistatic Foamed Polyurethane Challenge

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Anonymous Poster	Antistatic Foamed Polyurethane Challenge 08/09/2006 12:59 PM
	S. Hutchins writes: Our company makes polyurethane floats used in the measuring of gas and oil levels in hazardous areas. In order to obtain hazardous certification the floats must have a surface resistance of less than 10^9 so that they can dissipate a charge. The floats are molded with 15lb density 2 part thermoset polyurethane foam. The polyurethane creates a hard skin on the outside of the float making it very durable while the inside of the float is opened cell giving it good buoyancy. I am having difficulty finding an antistatic additive the can be mixed into the foam during molding, or a durable surface coating that can be applied after molding to give the float the antistatic properties required. Any insight or help to this challenge would be appreciated.
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CadManiac Member Join Date: Jan 2006 Posts: 5	#1 Polyuretahne Foam/Antistatic 08/10/2006 8:30 AM
	Not to familiar with the process, but check out this website. http://www.exair.com/product_info/product_info_pag e.htm
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DAG Guru Join Date: Sep 2005 Location: Texas Posts: 552 Good Answers: 8	#2 Shape 08/10/2006 8:37 AM
	Could you not manipulate the shape to facilitate discharge? __________________ David A Goodman
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billybob7196 Participant Join Date: Apr 2006 Posts: 3	#3 antistatic PUR 08/10/2006 6:01 PM
	why not use a conductive coating of epoxy. Chomerics makes some interesting materials that may fit your bill
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HerbVic Power-User Join Date: Feb 2006 Location: Detroit Downriver Posts: 119	#4 Materials Science reference 08/11/2006 9:20 AM
	Extensive cataloging of materials is available at this site. Perhaps you can find the one with just the properties you seek. http://www.azom.com/default.asp __________________ The legacy of the digital age is that of segregation through differing formats. - HerbVic
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LordMaximo Power-User Join Date: Nov 2005 Posts: 173 Good Answers: 3	#5 Anti-static additive batching 08/13/2006 7:53 AM
	Actually, you could add one more ingredient to your batching process. I would recommend the materials formula used in the generating of anti-static mat material. The same type of batching used for the desk top mats. You could incorporate this mixture into a thin layer lamanent to your outer coat and have a grounding method molded into the arm of the float device. Good luck.
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Shyam Guru Join Date: Aug 2006 Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India Posts: 3418 Good Answers: 32	#6 Increasing conductivity of foam 08/31/2006 4:08 PM
	You can mix silver powder or aluminum or copper powder having few micron grain size. Shyam __________________ Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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billybob7196 (1); CadManiac (1); DAG (1); HerbVic (1); LordMaximo (1); Shyam (1)

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