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Soleus International Inc. 
              9451 Telstar Avenue   El Monte, CA 91731 
         
 
TECHNICAL BULLETIN 
LINE SET OUTDOOR APPLICATIONS 
 
Use of Soleusair’s flexible rubber insulation [contained on our copper line sets] product outdoors may 
require special installation recommendations to prevent unacceptable degradation from ultra-violet (UV) 
exposure. 
 
Soleusair’s rubber insulation is produced from UV resistant materials. For moderate  UV exposure 
applications such as residential, no additional protective coating or jacketing is required for many years of 
service. However, for severe  UV exposure [roof top applications] or where optimum performance is 
required, it is recommended that the insulation be coated with a protective coating material or jacketing as 
required for the conditions. 
 
It is difficult to determine outdoor service life of the rubber insulation due to the wide range of 
environmental conditions that may be encountered. In addition to the harmful rays of the sun, other 
factors such as damage from maintenance workers, wildlife and weather conditions must also be factored 
in. Protective coating/ jacketing provide more than just protection from UV degradation. 
 
Accelerated UV aging studies are difficult to correlate to actual outdoor exposure because of the wide 
range of potential exposures for various applications and in different parts of planet Earth. In addition, 
there are no industry accepted performance criteria by which to determine if a product is meeting 
expectation or not. As such, Soleusair is not able to provide any type of specific life expectancy for our 
products when used outdoors.  
 
Some states (CA, TX, FL, etc) have recently made changes to their building codes as a result in mandates 
to improve energy savings, revising wall thickness requirements for some applications from 3/8” to ¾” or 
even 1” on some outdoor applications. These changes are state by state and in some cases even dictated at 
the local level. The codes have always stated that outdoor applications require the material to be protected 
from UV exposure. Some of the new codes now state: “should be protected from UV exposure unless the 
product is produced from UV resistant material”. This new wording poses a major problem in that the 
term “UV resistant material” is not defined. It is similar to the terms biodegradable or hypo-allergenic. 
Without specific definition or test methods, these terms are practically useless. As a result, Soleusair is 
reluctant to put the term “UV resistant” on its insulation because of the potential for misunderstanding. In 
some application (as noted above) the product will perform to typical expectation but in severe UV 
exposure applications or where other factors may enter into the conditions the product will be exposed to, 
it may not perform to expectation unless it is protected. 
 
Soleusair feels it is better to provide a conservative recommendation along with information on which our 
customers can make an informed decision. 
 
 
 
 
 
 
 
 
 
052307 
 
Tel: (626)350-3316      Fax: (626)350-6312