Where can I find a laboratory that can identify SBR (styrene Butadiene
Where can I find a laboratory that can identify SBR (styrene Butadiene
(OP)
I am dealing with an issue regarding black specs appearing in a drinking water system. I suspect they are of an elastomer material – primarily SBR (Styrene Butadiene Rubber) but I have been unable to find a lab capable of confirming this. The specks are not soluble in Freon, hexane, Acetone, methylene chloride or nitric acid. I suspect SBR would not be soluble in these solvents-but I am not 100% sure. Any advice?
Any one else one into this problem in a distribution system?
(Specs started appearing after a switch to chloramines from chlorine for disinfection. At least one corroded SBR gasket has been found in the system-hence the SBR rubber suspicion).
Any one else one into this problem in a distribution system?
(Specs started appearing after a switch to chloramines from chlorine for disinfection. At least one corroded SBR gasket has been found in the system-hence the SBR rubber suspicion).





RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
http://www.rlhudson.com/profile_material.html
http://www.rlhudson.com/tech_chloramine.html
The black specs may be ferrous sulfide caused by sulfur in the water.
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
Sometimes such black waters may be encountered in dead-end water mains where bacterial action has resulted in reducing some of the sulfate content to sulfide.
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene
Several years ago, there was an article in the AWWA JOURNAL that reported exposure to chloramine deteriorated virtually all elastomers to some degree, even FKM. Testing was done on stock sheet rubber only, not pipe gaskets. In order to meet required properties of AWWA standards, pipe gaskets have other additives. These additives apparently improve resistance to chloramine attack as well. Other, less sophisticated elastomers, such as what may be used in the manufacture of toilet flapper valves do not perform so well.
The use of chloramine for disinfecting potable water is not new. There is one large, mid-western city that has used chloramine for this purpose for many decades. There was an occasion to recover two SBR gaskets that had been in service and exposed to chloraminated water for almost thirty years. These gaskets were tested at Akron Rubber and found to meet the physical requirements for new gaskets. Close scrutiny of the gaskets revealed the presence of minute cracks in the portion exposed to the treated water. However, the cracks were judged to be superficial and that the gaskets were still in the early stages of their service life cycles.
In recent years, a number of water agencies have switched from chlorine to chloramines in an effort to comply with EPA-mandated limits on Disinfection By-Products that are considered carcinogenic. Considering the number of rubber products (gaskets, seals, washers, hoses, etc.) in contact with treated water, this subject has been of some concern to those contemplating the switch to chloramine water treatment.
RE: Where can I find a laboratory that can identify SBR (styrene Butadiene