BX-OSA-702 Silicone Adhesive
702 series silicone adhesive is a toluene solution based on polysiloxane raw glue and resin with additives added. It is a kind of high temperature resistant pressure sensitive adhesive. It can be combined with other methyl siloxane pressure sensitive adhesives to obtain specific properties. It can be used in a wide range of temperature, and can be used to bond a variety of low surface energy materials, such as silicones, fluoropolymers, polyolefins.
Ⅰ. Product Details
| Category | Index | 7022 | 7025 | 7028 | 7029 |
| Physicochemistry Index | Appearance | Colorless transparent viscous liquid | |||
| Solid Content(150℃*2h), % | 52-55 | 56-58 | 59-61 | 58-60 | |
| Viscosity(25℃), cp | 5-11W | 3-9W | 3-12W | 3-12W | |
| PH | 7 | 7 | 7 | 7 | |
| Specific Gravity(25℃) | 0.98 | 0.98 | 0.98 | 0.98 | |
| Bonding Properties After Vulcanization | Initial Adhesion(Steel Ball Number,∠30) | ≤16 | 14-23 | 14-23 | 14-24 |
| Peel Strength – PET transparent film(g/25um) | 200-300 | 400-600 | ≥800 | ≥900 | |
| Peel Strength – 1% wt color paste added(g/25um) | 80-150 | 300-500 | ≥700 | ≥800 | |
| Holding Power(260℃*3h) | No displacement | ||||
| Temperature Resistance(230℃*30min) | No residue in hot peeling | ||||
| Note: Dispensing ratio, original glue: thinner: BPO=100/65/1.5-2.0, solvent removal at 90℃*2min, curing at 160℃*6min; Test conditions: 25℃， 55-65%RH, 38um PET film thickness, 20-25 um cured glue thickness. *Supplementary Explanations: 1. The consistent PH value (7) across all models indicates neutral properties, suitable for use with most substrates without causing chemical corrosion; 2. “W” in viscosity values represents 10,000 (e.g., 5-11W cp = 50,000-110,000 cp), indicating high-viscosity characteristics suitable for adhesive applications requiring good thixotropy; 3. Peel strength shows a clear increasing trend from 7022 to 7029, reflecting progressive improvement in bonding performance—7028 and 7029 are particularly suitable for scenarios requiring high adhesion (e.g., high-strength film laminating); 4. The excellent high-temperature resistance (230℃*30min and 260℃*3h) confirms applicability in high-temperature processing or service environments, such as automotive interior bonding or electronic component assembly. | |||||
Ⅱ. Packaging and Storage
This product is packed in clear ,dry 200kg drum and sealed. Stored at room temperature (0~35℃).The effective storage period is 6 months. (Overdue the storage, if the product meet the standard, it can still be used.) Avoid direct sunlight. Be storied and transported as dangerous goods.
Ⅲ. Application range
As pressure sensitive adhesive, it can be coated on PET, aluminum foil and other substrates with traditional high temperature tape coating equipment, to make pressure sensitive adhesive tape. It has good temperature resistance and chemical resistance. It can also be used in printed circuit board electroplating process shielding, SMT process, FPC, PCB board, sand blasting, painting, high temperature paint, sheliding the protected part during gold plating or electroplating, and electronic, electrical and other products insulation bandage fixed.
Ⅳ. Instructions
1. Dosage of curing agent (peroxide can be used ,such as BPO or DPP, recommend with BPO) added may ranged from 1.5% to 2.5% of the glue depends on the substrate, coating equipment, curing period and required characteristics and other factors. To ensure better mixing of the curing agent and the glue, the curing agent needs to be completely dissolved in the solvent before thoroughly mixing with the glue. To avoid the impure particles of color paste or others, the dilution liquid should be filtered once using more than 250 mesh filter screen before coating on the machine.
2. Curing agent can be used to accelerate the curing speed or to apply at low temperatures, as well as improve the cohesion strength the adhesion property of the adhesive. The mixed peroxide dispersion liquid should be used up within 1-2 days. That is because peroxide will lose its activity quickly in the solvents. The sufficient dispersion of adhesive and peroxide in the mixing process is the necessary condition to ensure the consistency of the finished product.
3. 702 adhesive can be directly coated with traditional tape coating equipment. The adhesive can be further diluted with the compatible solvent such as toluene and xylene before coating. The advisable working liquid concentration is 35%. The concrete concentration is depending on your respective equipment and experience. When using the solvents, please ensure that it is good ventilated and comply with safety precautions and regulations of solvent suppliers.