Bostik LIQ. 1211 MOISTURE CURING SOLVENT-BASED ADHESIVE

LIQ. 1211 is a one-component solvent-borne rubber- based moisture curing adhesive designed for the assembly of interior trim components of automobiles. The product is a blue, medium-viscosity liquid adhesive designed to be spray applied to a variety of substrates, particularly unprimed polypropylene. The product is well suited for vacuum forming and pressure bonding applications with unprimed polyolefin foam, typically as a contact adhesive.
LIQ. 1211 offers good adhesion to a variety of substrates at a broad temperature range. The blue color offers easy visualization during application. This product also offers excellent processing and application consistency along with good shelf-life stability. LIQ. 1211 is formulated without the use of toluene or xylene.
FEATURES
Excellent for vacuum forming applications for foam bonding
Antifogging
Formulated without the use of toluene or xylene
APPLICATIONS TECHNIQUES
Substrates to be bonded should be clean and free from moisture, dirt, oil and other contaminants. Exposure to oils and plasticizers at the bondline can cause degradation of the bond over time. LIQ. 1211 is styrene based, making it susceptible to plasticizer
The adhesive should be applied by conventional spray An orifice of at least 1.4 mm should be used for the fluid tip / needle. The air cap should have a minimum number of holes, to prevent clogging and make easier clean-up.
For contact bonds, target a coat weight around 150 g/m² wet The adhesive should be applied to both substrates. For vacuum forming bonds, a target coat weight of 150 g/m² wet weight should be applied to the rigid side only.
Allow the material to dry properly prior to bonding. Forced drying with circulating air oven is recommended to eliminate the variability seen with drying at plant ambient conditions. Recommended drying is 80°C for 1 – 3. The optimum condition varies depending on oven choice, the amount of air flow over the part and the amount of air exchange within the unit itself.
Bonds can be made once the adhesive is dried. Open time (from the point that the adhesive is dry until it is bonded) should be minimized for optimum Open times of less than 15 minutes are recommended. Prolonged open time will allow the adhesive to begin reacting, making bonding difficult.
Position pieces Strong bond is made upon contact, limiting repositioning of the part.
For contact bonds, press parts together for 10-15 seconds at 5-7 psi (0.3 – 5 kg/cm²). Press and dwell time are critical to contact bonding. Individual users may determine conditions appropriate to their specific application. For vacuum forming, a bondline temperature of 110-130°F (43-54°C) should be achieved. The bondline temperature refers to the amount of heat transferred from the flexible substrates to the adhesive surface. Vacuum pressure should be 600 mm Hg for at least 10 seconds.
Adhesive should have adequate green strength for handling immediately. Full bond strength will develop over 96 hours at room temperature. Approximately 90% of the cure is achieved within the first 24 hours.