Construction Sealant Training - Sika
• Sealant Hardness – ASTM C 661 . ¾Is a measure of a sealants ability to resist the penetration by a Durometer probe. Rated on a scale from 0 – 100. The lower the number the softer the sealant. The softer the sealant the more movement it can take. Conversely, the higher the number the harder the sealant is and the less movement it can take.