Dymeric 240 is a gun grade, multi-component, chemically curing, polyurethane sealant that includes a tintable base, curative packet, and a choice of 70 standard colors.
Features / Benefits
Dymeric 240 is an all around general-purpose sealant that provides flexible, long life and durable waterproofing for both new construction and restoration projects
- Dymeric 240 meets or exceeds the requirements of the following specifications:
- • ASTM C-920, Type M, Grade NS, Class 50, Use T, NT, M, A, and O
- • Federal Specification TT-S-00227E, Type II, Class A
- • CAN/CGSB 19.24-M90, Type II, Class B
Dymeric 240 is available as a base and curative that can be tinted to your choice of 70 different colors, or we can match a special color for you.
308 linear feet of joint per gallon for 1/4” x 1/4” joints.
Where deemed necessary, use Tremco Primer #171 for porous substrates and TREMprime Non-Porous Primer for metals and plastics. Dymeric 240 typically adheres to common construction substrates without primers; however, Tremco always recommends that a mock-up or field adhesion test be performed on the actual materials being used on the job to verify the need for a primer. The field adhesion test can be found in appendixes X1 of ASTM C 1193.
At 72˚F (22˚C) and 50% relative humidity, Dymeric 240 will reach full cure in 4 days regardless of the applied width and depth of bead. As the temperatures decrease, the cure time of Dymeric 240 will increase. A good rule of thumb is an additional 24 hours for every 10°F decrease in temperature
Dymeric 240 may be used in any vertical or horizontal joint designed in accordance with accepted architectural/engineering practices. Joint width should be 4 times anticipated movement, but not less than 1/4” (6.4mm).
W = Sealant width, D = Sealant depth, C = Contact area.
EXPANSION JOINTS - The minimum width and depth of any sealant application should be 1/4” by 1/4” (6mm by 6mm). The depth (D) of sealant may be equal to the width (W) of joints that are less than 1/2” wide. For joints ranging from 1/2” to 1” (13mm to 25mm) wide, the sealant depth should be approximately one-half of the joint width.
The maximum depth (D) of any sealant application should be 1/2” (13mm). For joints that are wider than 1” (25 mm) contact Tremco’s Technical Service Department, or your local Tremco field representative. Tremco recommends that surface temperatures be 40˚F (5˚C) or above at the time the sealant is applied. If sealant must be applied in temperatures below 40˚F.