Norseal® V740 is a polyvinyl chloride foam sealant featuring a closed-cell structure and a pressure-sensitive adhesive on one side. It is engineered to offer a cost-effective solution for sealing against light, air, and moisture. The specially formulated reduced-density foam provides superior performance, making it well-suited for various applications such as appliance seals, wall panels, die-cut gaskets, and window and door weatherstripping. The Norseal V740 series is designed with multipurpose medium-density foam, providing an economical alternative to caulks and other sealants. It demonstrates versatility by conforming to curved and irregular shapes, and it boasts resistance to weather, fungi, and oxidation. Additionally, it remains flexible at low temperatures while maintaining dimensional stability.
Test Results:
Density (ASTM D-1667):
Importance: A low density of 9 lbs./cu. ft. (144 kg/m3) indicates a lightweight foam, contributing to fuel efficiency and overall vehicle weight reduction.
Hardness: Shore 00 (ASTM D-2240):
Importance: A Shore hardness of 28 suggests a material with moderate flexibility and resilience, which is desirable for accommodating movements and vibrations in a dynamic environment like a truck.
Force to Compress (ASTM D-1667):
Importance: The low compressive force of 3.5 psi (24 kPa) indicates ease of compression, ensuring effective sealing under varying loads without excessive pressure.
Compression Deflection (ASTM D-1667):
Importance: A low compression deflection of 2.0 psi (14 kPa) indicates the material’s ability to maintain its shape and sealing effectiveness under compressive forces.
Compression Set (NTP-37):
Importance: The 8% compression set loss signifies good recovery after compression, ensuring a durable and long-lasting seal over time.
Water Absorption (NTP-35):
Importance: The low water absorption of 2.5% by volume is crucial for preventing water ingress into the truck cab or body, which is vital for maintaining the integrity of the cargo and protecting the vehicle’s interior.
90° Peel Adhesion (PSTC-2):
Importance: The strong peel adhesion of 37.0 oz./in (405 N/m) ensures that the sealant adheres well to different surfaces, providing reliable and long-lasting sealing performance.
Elongation (ASTM D-412) and Tensile Strength (ASTM D-412):
Importance: High elongation (100%) and moderate tensile strength (40 psi or 276 kPa) indicate the material’s ability to stretch and withstand forces, contributing to its durability in challenging conditions.
Thermal Conductivity (ASTM C-518):
Importance: A low thermal conductivity of 0.28 BTU, in./hr.ft.2 °F suggests good insulation properties, which is beneficial for temperature control within the truck cab or body.
Foam Color – Black/Gray:
Importance: The color may be chosen based on aesthetic preferences, but black/gray is commonly selected for its neutrality and potential UV resistance.
In conclusion, the presented data emphasizes the importance of a balanced combination of properties, ensuring that the selected sealant meets the demanding requirements of truck cab and body applications, including durability, flexibility, water resistance, and thermal insulation.
