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Technical Data Sheet
SilGrip* PSA529
Description
PSA529 silicone pressure sensitive adhesive is a toluene solution of polysiloxane gum and resin. It is supplied at 55 percent silicone solids and may be further diluted with aromatic, aliphatic or chlorinated solvents. PSA529 may be blended with SR545 resin dispersion or with other methyl based silicone pressure sensitive adhesives to obtain specific performance properties.
PSA529 has an overall balance of peel strength, cohesion, lap shear strength and high temperature holding power, which provides a versatility that makes this product useful in a wide variety of applications, including fastening and bonding of dissimilar materials.
Key Features and Benefits
Wide temperature range performance, maintains good shear and tack properties at intermittent temperatures up to 500oF Adhesion to a wide variety of surfaces (stainless steel, anodized aluminum, steel) including low energy surfaces (silicones, fluoropolymers, polyolefines) Resistance to moisture, weathering (ozone, sunlight), chemical (acids, alkalis, oils) and biological (fungus) attack Elastomeric properties after curing with SRC18 catalyst Typical Physical Properties
Property
Viscosity @ 25º (77ºF ), cps(Brookfield RVF, #3 Spindle, 20rpm) TYPICAL CURED ADHESIVE PROPERTIES
(1) 2 mil dry adhesive thickness, 2 mil polyester film, uncatalyzed, curing cycle: 10 minutes air dry, 10 minutes at 150oC, stainless steel, 12 inches/minute, (2) Polyken Tack Tester, 1000g weight, 1second dwell time, cm/second draw speed, 2 mil dry adhesive thickness, 2 mil polyester film, uncatalyzed, curing cycle: 10 minutes air dry, 10 minutes at 150oC Patent Status
Nothing contained herein shall be construed to imply the nonexistence of any relevant patents or to constitute a permission, inducement or recommendation to practice any invention covered by any patent, without authority from the owner of the patent.
Product Safety, Handling and Storage
The warranty period is 6 months from date of shipment from Momentive Performance Materials if stored in the original unopened container at 25ºC (77ºF). Customers should review the latest Material Safety Data Sheet (MSDS) and label for product safety information, safe handling instructions, personal protective equipment if necessary, and any special storage conditions required for safety. MSDS are available at www.momentive.com or, upon request, from any Momentive Performance Materials (MPM) representative. For product storage and handling procedures to maintain the product quality
within our stated specifications, please review Certificates of Analysis, which are available in the Order Center. Use of other materials in
conjunction with MPM products (for example, primers) may require additional precautions. Please review and follow the safety information provided by the manufacturer of such other materials.
Processing Recommendations
Laminating Applications
PSA529 silicone adhesive is supplied at a viscosity suitable for conventional coating equipment. If necessary, it may be thinned with toluene, xylene or other compatible solvents. After the adhesive is applied to the substrate, it is exposed to a two step process: solvent removal and curing. Processing of PSA529 Catalyzed with Benzoyl Peroxide
Solvent Removal
To achieve optimum adhesive properties, it is essential to optimize the drying step of the process in order to assure that the solvent is removed from the adhesive film before the curing step of the process starts. Improper drying will result in residual solvent entrapment within the adhesive. If the adhesive is then exposed to temperatures higher than 93.5 o C (200 o F), decomposing peroxide catalyst can cause crosslinking reaction between solvent and adhesive through methyl groups on siloxane chains and on solvent molecules and adversely affect the properties of the adhesive. Typical temperature range for the drying step of the process is 83 o C (180 o F) to 90 o C (194 o F). A typical drying cycle is 2 minutes at 90 o C (194 o F). Curing Process
Once the solvent is removed from the adhesive film, the peroxide cure should be initiated by exposure to heat. A typical curing cycle is 2 minutes at 165 o C (329 o F). Longer exposure time and higher temperature, up to 204 o C (400 o F), can be used without adverse effects. The exact conditions required to achieve a complete cure will depend on oven length and efficiency, peroxide type and type of substrate used, and should be established during Catalysts
High purity, 98% benzoyl peroxide (3) in the quantity of 1 to 3% based on silicone solids, has been found to give the most consistent results in curing of silicone pressure sensitive adhesives. In applications requiring low temperature cure, 2,4 -dichlorobenzoyl peroxide, which is activated at 132 o C (270 o F), can be used. It should be noted that 2,4-dichlorobenzoyl peroxide may generate polychlorinated biphenyls during the curing process. Please refer to Code of Federal Regulations, title 40, part 761 regarding incidental PCB byproducts if 2,4- dichlorobenzoyl peroxide is utilized. The peroxide should be dispersed in solvent before it is mixed with the adhesive. Thorough mixing of the peroxide and adhesive to achieve homogeneous dispersion is essential for consistency of finished product.
(3) Available from: Elf Atochem North America, Inc.
Processing of PSA529 Catalyzed with SRC18
Room temperature curing can be obtained by catalyzing PSA529 adhesive with SRC18 amino functional silane.
Note: It is necessary ( for maximum physicals ) to add an amount of SRC18 catalyst that will eventually cause complete cure of PSA529 adhesive. Completely cured PSA529 adhesive is tack free and is not useful for pressure sensitive adhesive applications. When using SRC18 catalyst with PSA529 adhesive for laminating (bonding) dissimilar materials, follow SRC18 catalyst data sheet (document #CDS5187) precautions carefully. Bonding Applications
Catalyzed adhesive may be applied with a brush, roller or any suitable coating device. Thinning, if required, may be done with toluene or paint thinner. Both surfaces to be bonded should be thoroughly cleaned with alcohol, the adhesive should be applied to them and allowed to dry either in room temperature or in an elevated temperature. The length of drying time will depend on solvent used, adhesive thickness and temperature it is exposed to. The recommended adhesive thickness is 3 to 4 mils dry. After the solvent is completely evaporated from the adhesive, the surfaces to be bonded should be firmly pressed together and the adhesive should be allowed to cure.
Cure is a function of time and temperature. Room temperature cure at 21º-25ºC (70º-77ºF) will require 3-7 days for the catalyzed adhesive to develop maximum strength. The cure time can be shortened by elevating temperature to a maximum 165ºC (329ºF). A typical shortened cure cycle is 24 hours at 25ºC (77ºF) followed by 24 hours at 100ºC (212ºF). Note: Use adhesive in a well- ventilated area. Blending Instructions
Typical Formulation
SRC18 catalyst should be added to the adhesive and stirred well before using (consult Material Safety Data Sheets prior to use). Store catalyzed adhesive in tightly closed containers and use within 48 hours. Where longer pot life is required, dilute the adhesive mixture to approximately 30% silicone content with toluene or paint thinner. Diluted mixtures are useful up to three months.
Limitations
Customers must evaluate Momentive Performance Materials products and make their own determination as to fitness of use in their particular applications. From automotive to healthcare, from electronics to construction, products from Momentive Performance Materials Inc. are practically everywhere you look. We are a global leader in silicones and advanced materials with a 70+ year heritage of innovation and being first to market – with performance applications that improve everyday life. By knowing our customers’ needs and creating custom technology platforms for them, we provide science based solutions to help customers increase performance, solve product development issues and engineer better manufacturing processes.
Contact InformationFor product prices, availability, or order placement, contact our customer service by visiting momentive.com/ContactSilicones.
For literature and technical assistance, visit our website at: www.momentive.com Momentive and the Momentive logo are trademarks of Momentive Performance Materials Holdings Inc.
DISCLAIMERThe information provided herein was believed by Momentive Performance Materials Inc. (“Momentive”) to be accurate at the time of
preparation or prepared from sources believed to be reliable, but it is the responsibility of the user to investigate and understand other pertinent sources of information, to comply with all laws and procedures applicable to the safe handling and use of the product and to determine the suitability of the product for its intended use. All products supplied by Momentive are subject to Momentive’s terms and conditions of sale. MOMENTIVE MAKES NO WARRANTY,
EXPRESS OR IMPLIED, CONCERNING THE PRODUCT OR THE MERCHANTABILITY OR FITNESS THEREOF FOR ANY PURPOSE OR CONCERNING THE
ACCURACY OF ANY INFORMATION PROVIDED BY MOMENTIVE, except that the product shall conform to Momentive’s specifications. Nothing contained
herein constitutes an offer for the sale of any product.

Source: http://www.sinus-electronic.de/datenblaetter/momentive2009/Silgrip_PSA529.pdf