1 Dow Corning 995 Silicone . Structural Adhesive 1. PRODUCT NAME Limitations: Dow Corning 995 Federal Food and Drug Administration Dow Corning 995 Silicone Structural Silicone Structural Adhesive should not food-additive regulations Adhesive be applied: In below-grade applications To building materials that bleed oils, For use as an interior penetration 2. MANUFACTURER plasticizers or solvents materials such firestop sealing system as impregnated wood, oil-based In horizontal floor joints where Dow Corning Corporation caulks, green or partially vulcanized abrasion and physical abuse are likely Midland, MI 48686-0994. rubber gaskets or tapes to be encountered Phone: (517) 496-6000 In totally confined spaces (the To frost-laden or damp surfaces FAX: (517) 496-4586 sealant requires atmospheric moisture For continuous immersion in water 3. PRODUCT DESCRIPTION for cure) This product is neither tested nor When surface temperatures exceed represented as suitable for medical or Dow Corning 995 Silicone Structural 60 C (140 F) pharmaceutical uses.
2 Adhesive is a one-component, self- Where painting of the sealant is Composition and Materials: priming, shelf-stable, neutral-cure, required, as the paint film may crack Dow Corning 995 Silicone Structural elastomeric Adhesive specifically and peel Adhesive is a one-part, ready-to-use formulated for Silicone Structural To surfaces in contact with food material that has the consistency of glazing, exhibiting the following this sealant does not comply with toothpaste. This consistency remains unique features: Excellent unprimed adhesion to TYPICAL PROPERTIES. most common building substrates, These values are not intended for use in preparing specifications. including glass, reflective glass, anodized aluminum, granite and As Supplied paints, including most fluoropolymer- Color .. Black based paints. MIL-S-8802 Tack-Free Time, 50% RH, hours .. Excellent shelf life and Use By Curing Time, 50% RH, at 25 C (77 F), days.
3 7-14. dating Full Adhesion, days .. 14-21. Noncorrosive by-products Flow, Sag or Slump, inches .. < 20-year performance warranty Working Time, minutes .. 10-20. available Cures to extremely tough elasto- As Cured After 7 days at 25 C (77 F), 50% RH. meric rubber ASTM D 2240 Durometer Hardness, Shore A, points .. 40. Structural applications require prior ASTM D 412 Ultimate Tensile, psi .. 350. testing and written print review by Ultimate Elongation, % .. 525. Dow Corning . ASTM D 624 Tear Strength, die B, ppi .. 49. Basic Uses: Dow Corning 995 ASTM C 794 Peel Strength, 40. Silicone Structural Adhesive is designed for use in Structural appli- As Cured After 21 days at 25 C (77 F), 50% RH. cations such as factory or field glazing ASTM C 1135 Tensile at 25%, psi .. 48. of glass and metal. Tensile at 50%, psi .. 75. Once cured, this Adhesive forms a ASTM C 719 Joint Movement Capability, %.
4 50. durable, flexible, watertight bond that can be warranted for 20 years. As Cured After 21 days at 25 C (77 F), 50% RH and The performance of sealant in a Subjected to 4,500 hours QUV ASTM G-53. Structural joint may be simulated using ASTM C 1135 Tensile at 25%, psi .. 50. the ASTM C 1135 test procedure. Tensile at 50%, psi .. 78. The stress-strain relationship for Specification Writers: Please obtain a copy of the Dow Corning Sales Specification for this product, Dow Corning 995 Silicone Structural and use it as a basis for your specifications. It may be obtained from any Dow Corning Sales Office, Adhesive is illustrated in Figure 1. or from Dow Corning Customer Service in Midland, MI. Call 1-800-322-8723. Figure 1: Stress-Strain Relationship of Dow Corning 995 Silicone Structural These are preliminary guidelines, Adhesive1 consistent with common industry practice. 150. Preparatory Work: Clean all joints and glazing pockets, removing all 125 foreign matter and contaminants such as grease, oil, dust, water, frost, surface Stress, psi 100 dirt, old sealants or glazing compounds and protective coatings.
5 75 Metal and glass surfaces should be cleaned by mechanical or solvent 50 procedures. Detergent or soap and water treatments are not acceptable. In all cases where used, solvents should 25. Sealant Design Strength (20 psi) be wiped on and off with clean, oil-free and lint-free cloths. Follow solvent manufacturer's recommended safe 0 25 50 75 100 125 150 handling procedures. Strain, % elongation Masking: Areas adjacent to joints may be masked to ensure neat sealant 1. Stress-strain relationship properties are based upon a standard 1/2-inch by 1/2-inch by 2-inch tensile adhesion joint pulled at a rate of 2 inches per minute (ASTM C 1135). lines. Do not allow masking tape to touch clean surfaces to which the uniform over a wide temperature range Cured sealant will remain elastomeric Silicone sealant is to adhere. Tooling from -26 to 60 C (-15 to 140 F), allow- in cold to -40 C (-40 F) or heat to should be completed in one continu- ing the sealant to be applied easily at 149 C (300 F).
6 Ous stroke immediately after sealant most temperatures. application and before a skin forms. Packaging: Dow Corning 995 5. INSTALLATION Masking should be removed immedi- Silicone Structural Adhesive is supplied ately after tooling. Structural glazing applications for in oz (305-mL) disposable Method of Application: Install back- Dow Corning 995 Silicone Structural plastic cartridges that fit ordinary up material or joint filler, setting blocks, Adhesive must be reviewed by caulking guns, (17-L) bulk the Technical Service staff, spacer shims and tapes as specified. containers, 2-gal ( ) pails and 45- Dow Corning Corporation, Construc- Apply Dow Corning 995 Silicone gal (170-L) drums. It can be dispensed Structural Adhesive in a continuous tion Sealants Technical Service and by many air-operated guns and most operation using a positive pressure Development. types of bulk dispensing equipment.
7 A adequate to properly fill and seal the The following instructions provide a complete dispensing guide is available joint. Tool or strike Dow Corning 995. general overview of the installation from Dow Corning . process. Complete design and instal- Silicone Structural Adhesive with light Color: Dow Corning 995 Silicone lation guidelines are contained in the pressure to spread the material against Structural Adhesive is available in the back-up material and the joint Silicone Structural Glazing Manual, black. surfaces. A tool with a concave profile Form No. 62-351, available from Applicable Standards: Dow Corning is recommended to keep the sealant Dow Corning . 995 Silicone Structural Adhesive has within the joint. Joint Design: The design of a Silicone been internally tested and is designed Structural joint must be prepared by In glazing, tool the sealant applied to meet or exceed the test requirements the design professional, based upon at the sill so that precipitation and of: cleaning solutions will not pool.
8 Industry-accepted design guidelines. Federal Specification TT-S-001543A It is imperative that uncured Silicone A typical Silicone Structural joint is (COM-NBS) Class A for Silicone building sealants are not allowed to contact illustrated in Figure 2. Basic design sealants. nonabradable surfaces such as polished parameters include: Federal Specification TT-S-00230C Glue line thickness must not be less granites, metal or glass. Because excess (COM-NBS) Class A for one-component than 1/4 in ( mm) Silicone sealant cannot be completely removed with organic or chlorinated building sealants. Structural bite must not be less than ASTM Specification C-920 Type S, solvents, these surfaces must be masked glue thickness or extreme care taken to prevent any Grade NS, Class 25, Use NT, G and A. Structural bite (in) must be greater Silicone sealant from contacting them than or equal to the smallest leg of the 4.
9 TECHNICAL DATA during sealant application. Once an largest lite (ft) x windload (lb/ft2) 480. Dow Corning 995 Silicone Structural The Structural sealant joint must uncured sealant contacts the surface, it will leave a film that may change the Adhesive is virtually unaffected by be able to be filled using standard aesthetic surface characteristics of that sunlight, rain, sleet, snow and tempera- caulking practices substrate. ture extremes. Its unique weatherability The Structural joint must not move In cases where uncured sealant is enables it to retain its original design during cure properties even after years of exposure. inadvertently applied to adjacent sur- faces, the sealant should be cleaned Figure 2: Typical Silicone Structural Joint Dow Corning Corporation in writing Silicone within 30 days of the occurrence of the Weatherseal Bite failure. Dow Corning 's sole liability Sealant shall be to furnish sufficient Silicone Glass replacement material to restore the integrity of the weatherseal.
10 Any labor or other cost associated with the repairs Glue Line is the responsibility of the owner. Thickness DOW Corning SHALL NOT BE. LIABLE FOR AND EXPRESSLY DIS- Silicone Structural CLAIMS ANY LIABILITY FOR DAMAGE. Adhesive Structural Backer Rod TO THE CONTENTS OF THE STRUC- Spacer TURE OR FOR CONSEQUENTIAL OR. Mullion INCIDENTAL DAMAGE, WHETHER IN. CONTRACT OR IN TORT, INCLUDING. NEGLIGENCE. while still uncured, using a commercial products offer a variety of physical THIS WARRANTY IS IN LIEU OF. solvent such as xylol, toluol or methyl characteristics and adhesion prop- ALL OTHER WRITTEN OR ORAL, ethyl ketone. Observe proper precau- erties. Dow Corning 995 Silicone EXPRESS OR IMPLIED WARRANTIES. tions when using flammable solvents. Structural Adhesive is part of that line AND DOW Corning SPECIFICALLY. Safe Handling Information and, when used with compatible sub- DISCLAIMS ANY IMPLIED WARRANTY.