SILICONE SEALANT GLOSSARY OF TERMS:
Modulus: This is a calculation of stress and strain measurements of the cured sealant. Low modulus dictates a softer and stretchier sealant. High modulus being harder and less elastic.
RTV:
LMA: HMA: LMN:
This has been around for years and is normally associated with acetoxy products for engineering. However, RTV stands for ‘Room Temperature Vulcanising’, all this means is that it cures at room temperature. Technically, all one part, moisture cure silicones are ‘RTV’. Low Modulus Acetoxy cure. High Modulus Acetoxy cure. Low Modulus Neutral cure.
Elasticity: Or movement accommodation is the percentage a sealant will expand and contract in use. For example the movement required when installing a door frame would need a higher degree of flexibility than one sealing around a work top. A Low Mod Neutral would have approx 25% movement capability compared to 20% of a High Mod Acetoxy.
UNDERSTANDING EN15651 AND CE MARKS In July 2014, a new standard for sealants replaced ISO11600. This new standard identifies sealants for specific environments:
Part 1 concerns Facade sealants, designated as F. Part 2 concerns Glazing sealants, designated as G. Part 3 concerns Sanitary sealants, designated as S. Part 5 concerns Pedestrian Walkway sealants, designated as PW.
Within each of these categories, the sealants are given sub-categories some of which are unique to that category. Some multi-purpose sealants can carry designations from more than one category.
• EXT means the product is tested for exterior use. • INT means the product is tested for interior use. • 20LM or 25LM is the % movement capability and Low Modulus characteristic. • 20HM or 25HM is the % movement capability and High Modulus characteristic. • XS1, XS2, XS3 and S1, S2, S3 is microbial resistance, 1 is highest, 3 is lowest. • CC means the product is suitable for use in cold climates.
So for example THE ONE, which is a low modulus neutral cure silicone conforms to all 4 parts of EN15651 and therefore is designated as F EXT-INT, G 25LM, XS1, PW EXT-INT, CC.
On the following pages is a chart featuring the advantages and general usage recommendations of our silicones and sealants range.
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APPENDICES: Silicones & Sealants
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