ThreeBond Technical News Issued January 1, 2018 Ultra-Soft UV-Cured Formed-in-Place Gaskets Introduction ThreeBond is a company founded on a mission of preventing leaks that occur in the manufacturing industry, and we hold the distinction of releasing Japan’s very first liquid gasket. Currently, liquid gaskets have been widely adopted for the FIPG (formed-in-place gaskets) used with the automatic coating equipment employed in automobile, electronics, infrastructure and a wide range of other industries and fields. Within sealing, there are also UV-CIPG (UV-cured-in-place gaskets) introduced in ThreeBond Technical News No. 72, which are assembled then sealed after coating and UV curing. Restrictions in UV-CIPG materials led to risks such as dimensional tolerance-induced seal failure and issues where compression could not be achieved for low-rigidity components. Here, we will introduce ThreeBond 3166, an ultra-soft UV-cured formed-in-place gasket with reduced dimensional tolerance risk thanks to being made softer, more durable and more chemically resistant than former ThreeBond products for a wider compression ratio. Hereafter, ThreeBond is abbreviated as TB.

1. What is a Gasket? According to JIS (Japanese industrial standard), gasket is defined as “an object used to prevent joint leakage through insertion in joints of pipes and equipment and tightened by a bolt or some other method” as show in Figure 1. Fig. 1 Basic Gasket Seal Structure Gaskets are used in automobile engines, electronic parts and a wide range of markets to seal everything from lubricants and hydraulic fluid to water and dust. Gaskets are classified by their properties into solid and liquid types. Previously, solid gaskets had been widely used to seal flange surfaces, but liquid...

With moisture-cured silicone FIPG, a liquid sealant is applied to the flange surface then assembled with the workpiece while uncured. To cure sealant takes time after assembling. Additionally, recent years have seen a greater number of low-rigidity workpieces used in the interest of component weight reduction, so in conventional CIPG materials with a high modulus of elasticity there was also the issue that e compression deformed the workpiece, making it impossible to obtain the determined surface pressure, which in turn further increased the risk of sealing failure. Solid gaskets are formed as...

5-1 Characteristics TB3166 is a silicone-base non-solvent UV curing resin with characteristics as follows. 1. Cures quickly with UV light. 2. Very soft when cured. 3. Can be assembled assembled on workpieces with lower surface pressure and rigidity than conventional CIPG materials. 4. Usable with a wide range of compression ratios. 5. Demonstrates resistance to heat and cold that is particular to silicone. 6. Excellent chemical resistance. 5-2 Characteristics Table 3 shows TB3166 uncured material properties. You can see if TB3166 has been applied thanks to its blue color. Once it is cured, this...

Surface Pressure High Compression Conventional TB Product [Test conditions] Bead height: 1.5mm; Surface pressure measurement device: NITTA Corporation I-SCAN; Curing conditions: Estimated light approx. 45k J/m2 Fig. 3 Compression Ratio vs Surface Pressure The results indicate a change in pressure resistance depending on the presence or lack of a wall. In single-wall flanges, the wall suppresses pressurized sealant movement to improve sealability, even at a 20% compression ratio. In conventional TB products, surface pressure increases at a compression ratio of 55% or more, but TB3166 maintains...

These measurements confirmed that TB3166 can seal 0.4 MPa pressure with 20 to 80% compression ratio after 120°C for 1000h. 5-7 Post-Durability Test Rubber Characteristics Figures 6, 7 and 8 indicate rubber characteristics after exposure to various conditions. Elongation rate (%) These results indicate a usability of TB3166 in a wide range of compression ratios with excellent durability. Although rubber characteristics tend to be a bit lower at 120°C, a sufficient level was maintained in all conditions. [Test conditions] Cured item: No. 3 dumbbell, 2mm thick Curing conditions: Estimated light...

Elongation rate (%) [Test conditions] Cured item: No. 3 dumbbell, 2mm thick Curing conditions: Estimated light approx. 45kJ/m 2 Tension rate: 500mm/min [Immersion conditions] 120°C×72hrs (Room temperature for dilute sulfuric acid only) Chemicals: Engine oil, ATF, power steering oil, brake fluid, antifreeze (50wt%), dilute sulfuric acid (40wt%), antifreeze agent (50wt%), water vapor (120°C, 100% saturated, 2 pressure environments) Fig. 10 Post-Chemical Resistance Test Elongation Rate Thanks to excellent durability and chemical resistance as mentioned above, it is usable as a water and dust-proof...

Closing Here, we introduced an even softer material than conventional UV-CIPG to mitigate case dimension control width two times issue not good in these products. TB3166 demonstrates excellent durability and chemical resistance which will lead to future development for application in a wide range of markets. We at ThreeBond will continue to focus our efforts on product and technology development in line with market trends in order to ensure the contribution our products make to the industry. 3) ThreeBond Technical News No. 72, 2009, ThreeBond ThreeBond Co., Ltd. R&D Headquarters Development Division...