General Gel Info

/General Gel Info
General Gel Info 2019-04-11T23:44:24+00:00

At present, WM Plastics manufactures two types of urethane gels used in Cleanrooms to seal HEPA UPLA filters. They are combined by different methods, but the end results are the same. This section is dedicated to information that is common to both Easy Pour and Soft Seal Gels. Click on the links to the left for the specific information on Molecular Contaminants, Waste Disposal, Biological Fungal Growth, UV Rays, Compatibility, Temperature Range and Penetration.

Easy Pour Gel Seal HEPA UPLA Filters

Molecular contaniments in clean rooms can deposit on product surfaces, causing yield problems. We have tested our products to insure they do not contain any of the following known problematic compounds:

  • The user should test all components which will come in physical contact with, or be in close proximity to gel, for compatibility.
  • Urethane gel usually do not react with other materials, but there are exceptions.
  • Alcohol based caulking compounds should not be used in conjunction with gels. This includes products sold under the name “Climacel”.
  • Gels do not react with silicone caulking used in many clean room applications, but it will not adhere to any surface containing silicone.
  • Care should be taken to use only the amount of silicone caulk needed for sealing, and keep spread to minimum. This is a especially critical in restricted areas such as sprinkler openings, alarms, etc. The initial seal should not be aggected, but problems could arise whn filters are removed.
  • Our gels maintain an effective seal over a wide temperature range: -10F to 150F.
  • Penetration is affected at lower tempertures, but the seal is not.
  • Filters will remain sealed at lower tempertures, but should not be installed or removed below 65F.
  • You should test a sufficent amount of the gel for your particular application before using.
  • If your application approaches the extremes of a temperture range, please contact us.
  • UV Rays from a varity of sources are a major cause of urethane degradation on the exposed surface of the gel.
  • A hardening of the gel surface (skinning), or the appearance of sand like particles may be indications of this degradation
  • With the exception of extreme cases, filters in degraded gel should continue to seal without leakage. These conditions however, may cause problems with the repenetration or seal of another filter being installed.
  • To combat the effects of harmful rays, our products are formulated with the latest urethane stabilization technology. This is important, because it significantly increases the life of the gel.
  • The nature of urethane gels requires the use of a Penetrometer to quantify their “softness”, for quality control purposes.
  • Product is shipped only when data conforms to rigid QC parameters. These procedures help insure that optimal materal is delivered to the job site
  • We use a Precision Scienctic Model 13AY-3, with a 19- gram load. This enables our lab to make reliable, consistent readings when the gel is manufactured.
The Research Tringle Institute (Durham, NC) was commissioned to evaluate the ability of our gels to support biological/fungal growths. Testing followed the guidelines of ASTM 6329-98, under controlled conditions that were optimal for growth. None of the organism introduced during the 90-day incubation period survived. Information on the ASTM procedures are available upon request.
 View the report
Soft Seal Gel Seal HEPA UPLA Filters

Soft Seal is a two-part urethane combined in a 1:1 ratio by weight or volume. This is a fast setting gel that allows filters to be set very quickly after pouring. Actual cure time depends on the ambient temperature of the room. As temperature increase, cure time decrease. 

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Easy Pour Gel Seal HEPA UPLA Filters

Easy Pour is our next generation “one part” urethane gel. The critical chemical balance needed to have a quiality product is established during the manufacturing process, not at the job-site. Pour in a pre-measured container of Blue Activator, then thoroughly mix to initiate the cure.

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