Bostik 955-SL

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Description for Bostik 955-SL

A one-component, self-leveling polyurethane sealant capable of dynamic joint movement totaling 50% of original joint geometry (±25%). The sealant cures to a tough, flexible rubber when exposed to moisture present in the atmosphere.

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Application Type	Bond, Seal
1 Part or 2 Part	1-Part
Material Form	Paste
Substrate	Aluminum, Ceramic, Steel, Stone, Wood
Industry	Light vehicle traffic
Manufacturer	Bostik
Chemistry	Polyurethane
Cure Method	Moisture
Cure Temperature (°C)	25
Cure Time (min)	2,880 to 4,320
Viscosity (cPs)	Self-leveling
Ozone Resistance	Excellent Ozone Resistance
Key Specifications	ASTM (American Standard Test Method): C-920: ASTM C-920, Type S, Grade P, Class 35, Use T, NT, A and M, CAN/CGSB (Canadian General Standards Board): Canadian Specification CAN/CGSB-19.13-M87., TT (U.S. Federal Specification): S-00230C: TT-S-00230C, Tipe I, Class A.

Best Practices for Bostik 955-SL

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Technical Data for Bostik 955-SL

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Overview

Application Type
- Adhesive - Bond
- Sealant - Seal
1 Part or 2 Part
- 1-Part
Material Form
- Paste
Substrate
- Ceramic
- Aluminum
- Steel
- Wood
- Stone
- Other - Blacktop, Marble
Industry
- Other Transportation - Foot traffic
- Automotive - Light vehicle traffic
- Construction - Cures to form a durable, flexible, waterlight bond with most building materials in any combination including: stone, masonry, blacktop, ceramic, marble, wood, steel, and aluminum, Sealing expansion joints, Masonry, Sealing control and perimeter joints in institutional floors, Sealing control and perimeter joints in factory, Sealing control and perimeter joints in driveway, Sealing control and perimeter joints in patios, Sealing control and perimeter joints in malls, Sealing control and perimeter joints in plazas, Sealing control and perimeter joints in pavement, Sealing control and perimeter joints in parking decks
Chemistry
- Polyurethane
Cure Method
- Moisture / Condensation Cure - Moisture
Key Specifications
- ASTM (American Standard Test Method) : C-920 : Class 35 - ASTM C-920, Type S, Grade P, Class 35, Use T, NT, A and M
- CAN/CGSB (Canadian General Standards Board) : 19.13 - Canadian Specification CAN/CGSB-19.13-M87.
- TT (U.S. Federal Specification) : S-00230C : Class A - TT-S-00230C, Tipe I, Class A.

Specifications

Cure Specs

Cure Temperature (°C)	25	Test Method
Cure Time (min)	2,880 to 4,320	Test Method
Viscosity (cPs)	Self-leveling
Tack Free Time (min)	120	Test Method
Work / Pot Time (min)	90	Test Method

Bond Strength

Peel Strength (piw)	>30	Test Method
Tensile Strength (psi)	171	Test Method

Material Resistance

Ozone Resistance	Excellent Ozone Resistance
UV Resistance	Good	Test Method

Hardness

Shore A Hardness	35	Test Method
Elongation (%)	500	Test Method
Modulus (psi)	80	Test Method

Business Information

Shelf Life Details	Shelf life of Chem-Calk® 955-SL must be checked prior to using the product, do not use past its shelf life. Caulk past its shelf life may not perform or adhere as described by this data sheet. High temperature and high relative humidity may reduce significantly the shelf life of polyurethane sealants. If you are unsure of the expiration date of your Bostik product, please call customer service at 1-800-7/BOSTIK (1-800-726-7845) to check if the product is still within its shelf life.

Not Good For

Don't Use For	Do not apply over damp, contaminated, loose surfaces, The self-leveling sealant should not be used in joints with more than a two degree slope. Joints formed with Chem-Calk® 955-SL can be expected to extend and compress a total of 50% of the installation width with no more than_x00D_ 25% movement in a single direction without affecting the seal or adhesive bond, must NOT be used to seal narrow joints or fillet joints, Smearing and feathering, continuous immersion in water or any other fluid, exterior or interior sealing below the waterline, do not expose to curing silicone_x00D_ sealants, alcohol, acids or solvent-based materials

Best Practices for Bostik 955-SL

*See Terms of Use Below
1. Design
  
  In general, more joint movement can be accommodated in a thin bead of sealant than a thick bead. Bostik Chem-Calk 955-SL polyurethane sealant should be no thicker than 1/2" (12.7mm) and no thinner than 1/4" (6.4mm). In joints between 1/2" and 1", the ratio of sealant width to depth should be approximately 2:1. Sealant width in joints between 1/4" and 1/2" should be 1/4" deep. Joints with dynamic movement should not be designed in widths less than 1/4".
2. Surface Preparation
  
  Surfaces must be structurally clean, dry (no frost) and structurally sound, free of contaminants, including but not limited to dust, dirt, loose particles, tar, asphalt, rust, mill oil, etc. If substrate is painted or coated, scrape away all loose and weakly bonded paint or coating. Any paint or coating that cannot be removed must be tested to verify adhesion of the sealant or to determine the appropriate surface preparation if needed.
  
  To remove laitance and any other loose material, clean concrete, stone or other masonry materials with nonalcoholic-based solvent by washing, grinding, sandblasting or wire brushing as necessary . Do not use water to clean substrates. Dust must be thoroughly removed after cleaning.
3. Application
  
  Priming is always required for any on or below grade application or where standing water is expected to accumulate. Priming is required on all ferrous-based metals and in all applications exposed to intermittent or continuous water immersion. If sealant is to be applied to a material with specially treated surfaces or of particularly unusual surface characteristics, or if the sealant system will be exposed to intermittent ponded water , consult Bostik Technical Service for primer recommendations.
  
  Bostik Chem-Calk 955-SL comes ready-to-use. Cut spout or tip to desired bead size. Apply moderate pressure to break seal inside the nozzle. Apply by using a professional caulking gun. Use opened cartridges and sausages the same day they are opened. Apply Bostik Chem-Calk 955-SL polyurethane sealant in a continuous operation using positive pressure to the bottom of the joint to properly fill and seal the joint. When applying, avoid air entrapment and overlapping. Tool the sealant before the skin forms with adequate pressure to spread the sealant against the backup material at the bottom and sides of the joint. A dry tool with a concave profile is recommended for that operation. Do not use water or soapy water for this operation. Avoid smearing and feathering of the sealant to allow full performance of the cured seam. Excess sealant should be dry-wiped or joints should be properly taped. Tooling of the uncured sealant will aid the wetting of the sealant to the substrate.
  
  If the sealant becomes damaged, replace the damaged portion by removing the old sealant completely, cleaning the surfaces and reapplying a fresh and appropriate amount of new sealant in accordance with the directions and information contained in this data sheet
4. Clean-Up
  
  After dry-wiping uncured sealant from substrates and tools, remaining uncured sealant can be removed by using Xylene, Toluene or similar aromatic solvents. Please refer to the MSDSs provided for these solvents before use. Bostik® Hand and Tool towels can also remove uncured sealant. Cured sealant is usually very difficult to remove without altering or damaging the surface to which the sealant has been misapplied. Cured sealant can be removed by abrasion or other mechanical means (scrapers, putty knives).
5. Testing
  
  Prior to any use, however, it is always recommended that the sealant be applied on the surface to test adhesion.
  
  A hand pull test must be run before the job starts and at regular intervals during the job. It must be run on the job site after the sealant is fully cured, usually within 7 to 21 days. (Adhesion may develop fully after at least 14 days.)
  
  The hand pull test procedure is as follows: Make a knife cut horizontally from one side of the joint to the other.
  
  Make two vertical cuts approximately two inches long, at the sides of the joint, meeting the horizontal cut at the top of the two-inch cuts.
  
  Grasp the two-inch piece of sealant firmly between the fingers and pull down at a 90° angle or more, and try to pull the uncut sealant out of the joint.
  
  If adhesion is sufficient, the sealant should tear cohesively in itself.
  
  Sealant may be replaced by applying more sealant in the same manner as it was originally applied. Care should be taken to ensure that the new sealant is in contact with the original, and that the original sealant surfaces are clean, so that a proper bond between the new and old sealant will be obtained.
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