Window and Door Shop Fabrication / Silicone Adhesion Test
Founded in 1862, Pecora Corporation® is an American manufacturer of architectural weatherproofing and building sealant products.
- Full line of silicone, urethane and latex sealants
- ISO 9001:2008 Certified
- Wide range of building sealant properties for Commercial/OEM Markets
- Innovative product development and custom color matching
- Private label capabilities
Pecora offers a complete line of high performance glass and glazing sealants for demanding structural and non-structural applications that are suitable for factory or field use. Pecora’s glazing solutions include products with high green strength, long lasting bonds to a variety of substrates, and Pecora’s industry leading non-staining technology (NST).
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Pecora – FAQ
Technically speaking the term caulk is actually a verb that describes the process of sealing up a construction joint. Within the building trades the term is used loosely referring to almost any type of sealant material. The term is also used when referring to early “calks” such as oil based, latex, and butyl “calks”. The term sealant refers to an elastomeric material used to fill and seal an expansion joint. Sealant materials prevent the passage of water and allow for horizontal and lateral movement at the expansion joint.
The ideal answer to this question is that primer should be used whenever cohesive failure is not achieved in the absence of primer. Of course this is assuming that sealant applicators conduct field adhesion testing. Or that all construction projects take advantage of adhesion testing services offered by most sealant manufactures. For specific primer recommendations, contact the Pecora Technical Services Group at 1-800-523-6688.
The obvious difference is that a two-component sealant is composed of two parts, a base component and an activator component. The activator component is typically added to the base component and mixed for a prescribed period of time before it is ready for application. Two component sealants are typically packaged in buckets while a one-component sealant is typically packaged in a cartridge. Some of the not so obvious characteristics of one and two component sealants are listed below:
|One Component||Two Component|
|No mixing required||Mixing required|
|No special equipment required||Bulk guns and mixing equipment required|
|Require exposure to atmospheric moisture to cure||Cure without exposure to atmosphere|
|Color added by manufacturer||Color added at job site|
|Limited shelf life||Extended shelf life|
|Cures from exposed surface down||Cures uniformly|
|Generally slower cure speed than two component||Generally faster cure speed than one component|
|Requires open cell backer rod||Can use open cell or closed cell backer rod|
Humidity is generally only a factor when applying one component moisture cure sealant. The effect of humidity can be summed up as follows: The higher the % relative humidity the faster the sealant will skin over and ultimately cure through. And of course at lower humidity levels the skinning process and ultimate curing will be extended. Low humidity levels are characterized as below 30% relative humidity and high humidity levels as above 70% relative humidity. The effects of temperature as explained above must also be considered when applying a one-component sealant. The higher the temperature and humidity the faster the skinning and ultimate cure.
Pecora’s goal is to provide our customers with comprehensive solutions – not just products. Pecora’s experienced technical services representatives and sales representatives are available to answer your questions concerning sealant selection, requirements and recommendations on a per job basis. We also offer complete technical support.