SEMICOSIL® 988/1K
SEMICOSIL® 988/1K is a non-slump, thermally curable, addition curing one-part silicone rubber.
特性
- Ready-to-use, one-part silicone
- Thixotropic
- Low-stress sealing adhesive
- Medium Hardness
- Primerless adhesion
- Rapid heat cure
- General purpose adhesive for the electronics industry
- FIPG and CIPG applications
- Chip bonding (SEMICOSIL® 988 1K trans 30 ml cartridge)
SEMICOSIL® 988 1K trans shows good primerless adhesion to many substrates.
We recommend running preliminary tests to optimize conditions for the particular application.
Comprehensive processing instructions are given in our leaflet „ Room Temperature Vulcanizing (RTV) Silicones (Materials and Processing Guidelines)” which can be downloaded from WACKER Chemie AG website.
All equipment and surfaces must be clean and free of contaminants that will prevent adhesion and/or inhibit the cure of SEMICOSIL® 988/1K
Separation layers on bonding substrated may be formed from residues of previous processes, from migrating additives or unintended contaminations. Examples of separating molecules among others can be processing fluids or deforming agents that are not able to built chemical links to reactive and accessible anchor groups of the substrate surface or to the silicone elastomer.
Examples of inhibiting contaminants are sulfur containing materials, plasticizers, urethanes, amine containing materials and organometallic compounds – especially organotin compounds.
If a substrate’s ability to inhibit cure or built up adhesion is unknown, a small scale test should be run to determine compatibility.
SEMICOSIL® 988/1K shows good primerless adhesion to many substrates. We recommend to run preliminary tests to optimize conditions for the particular application.
Safeguarding of reproducable and suitable surface quality is recommended. State of the art methods include in-line surface pretreatments like plasma processes or laser pretreatment.
Because of the high thixotropy (shear thinning effect) SEMICOSIL® 988/1K can be dispensed easily with all state-of the art dispensing equipments.
Since silicones dissolve notable amounts of air, an in-line degassing is recommended.
SEMICOSIL® 988 1K works best when cured at 125 °C or more.
Curing time should be adapted to the size and heat sink properties of the components and parts.
The term "curing" time describes the time needed for solidification of the material.
For typical substrates adhesion built-up is accomplished within this time, which can be observed by cohesive failure upon adhesion test.
However, depending on the surface quality of the bonding surfaces, time to adhesion might differ from given curing profiles.
In the interest of robust processing it is highly recommended that for selected curing temperatures & times aging tests on specific customers parts are carried out to safeguard the process.
For chip bonding applications SEMICOSIL® 988/1K is delivered in 30 ml cartridges.
Material typically is free of visual and macroscopic air inclusions. As silicones dissolve significant volumes of air for sensitive applications an in-line degassing may be considered. Entrapment of air by processing conditions has to be avoided. Pressure-time dispensing equipment exposing directly air-pressure to the piston of the cartridge may result in entrapment or saturation of air into the silicone. Preferentially, volume-time dispensing with mechanical movement of the cartridge pistion can be used.
SEMICOSIL® 988/1K 30 ml cartridges are delivered at <= 15°C, should be stored under +8°C, preferentially between +2 and +8 °C and typically should be warmed to room temperature in the closed 30 ml cartridge prior to processing. At room temperature cartridge content should be processed within 10 days.
储存
The 'Best use before end' date of each batch is shown on the product label. Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons. Material should be stored between +5 and +25°C in Hobbock. 30 ml cartridges of SEMICOSIL® 988/1K should be stored below 8 °C in the tightly closed original container.
销售和支持
200233 Shanghai
中国大陆
+86 21 6130-2500 （传真）