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Description for Bostik Chem-Calk 550
Two-component, pourable, architectural grade sealant capable of dynamic joint movement; properties remain stable in severe weather and temperature changes.Application Type Bond, Seal 1 Part or 2 Part 2-Part Material Form Paste Substrate Ceramics, Metals, Plastics, Steel, Wood, Concrete, Porous Manufacturer Bostik Chemistry Polyurethane Cure Method 2 Parts Cure Temperature (°C) 25 Cure Time (min) 10,080 Viscosity (cPs) Pourable Color Stone, standard colors (25), Uni-base Ozone Resistance Excellent Ozone resistance High Temperature Resistance (°C) 66 Low Temperature Resistance (°C) -29 Density (g/cm³) 13.4 (lbs/gal) Key Specifications ASTM (American Standard Test Method): C920: C920, Type M, Grade P, Class 25, CAN/CGSB (Canadian General Standards Board): CAN/CGSB-19.24-M90, TT (U.S. Federal Specification): S-227E: TT-S-227E Class A -
Technical Data for Bostik Chem-Calk 550
Overview
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1 Part or 2 Part
- 2-Part
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Material Form
- Paste
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Industry
- Industrial - Control, Malls, Sealing expansion
- Construction - Driveways, Factory floors, Institutional floors, Patios, Pavements, Perimeter joints in parking decks, Plazas, Masonry
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Chemistry
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Cure Method
- 2-Part Cure - 2 Parts
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Color
- Gray - Stone
- Other - standard colors (25), Uni-base
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Key Specifications
- ASTM (American Standard Test Method) : C920 : Class 25 - C920, Type M, Grade P, Class 25
- CAN/CGSB (Canadian General Standards Board) : 19.24 - CAN/CGSB-19.24-M90
- TT (U.S. Federal Specification) : S-227E : Class A - TT-S-227E Class A
Specifications
Cure Specs
Cure Temperature (°C) 25 Test Method Cure Time (min) 10,080 Test Method Viscosity (cPs) Pourable Work / Pot Time (min) 120 to 300 Test Method Bond Strength
Peel Strength (piw) >12 Test Method Tensile Strength (psi) 230 Test Method Material Resistance
Ozone Resistance Excellent Ozone resistance UV Resistance Good Test Method High Temperature Resistance (°C) 66 Low Temperature Resistance (°C) -29 Hardness
Shore A Hardness 35 Test Method Flexibility Flexible, Elastomeric Modulus (psi) 75 Test Method Other Properties
Density (g/cm³) 13.4 (lbs/gal) Test Method Business Information
Shelf Life Details When stored at or below 80°F (27°C), Chem-Calk® 550 polyurethane weatherproofing sealant has a shelf life of twelve months from date of shipment from Bostik Findley’s warehouse facilities. Shelf Life Temperature (°F) <80 Shelf Life Type From the date of shipment Shelf Life (mon) 12 Not Good For
Don't Use For submerged joints, exterior or interior structural sealing of submerged applications. Don't Use With marble, limestone, granite -
Best Practices for Bostik Chem-Calk 550
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Application
Install backup material or joint filler as specified
and primer when applicable. Apply Chem-Calk® 550 polyurethane sealant in a continuous operation using a positive pressure adequate to properly fill and seal the joint. The Chem-Calk® 550 is pourable and will tend to seek its own level. Tooling is recommended to ensure proper wetting of the joint surfaces.
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Mixing
Chem Calk® 550 is a multipart sealant, provided as base, activator (or curing agent) and color pack. All the accelerator and appropriate color pack must be thoroughly mixed with the base to avoid uncured areas and/or color streaks. Failure to follow mixing instructions implicitly can result in spotty cure, random cure or complete lack of cure of the sealant. Do not attempt to mix partial units, as the exact ratio of curing agent to base is essential for optimum performance.
See Vendor Technical Data Sheet for more info.
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Clean-Up
Excess sealant should be dry-wiped from all surfaces while still uncured, and followed with a commercial solvent wipe. Contact Technical Service for specific solvent recommendations. Should sealant accidentally begin to cure on adjacent porous surfaces, the excess sealant should be allowed to progress through the initial cure or setup. It should be removed promptly by abrasion or other mechanical means. CURED SEALANT IS USUALLY VERY DIFFICULT TO REMOVE WITHOUT ALTERING OR DAMAGING THE SURFACE TO WHICH THE SEALANT HAS BEEN MISAPPLIED. Bostik Findley recommends the use of Bostik® Hand & Tool Towels for easy removal of uncured CC550 from surfaces, hands and tools.
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
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25°C | After 7 days cure at 77°F and 50% RH |
Cure Time Test Methods
Cure Time | Test Method |
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10,080 min | After 7 days cure at 77°F and 50% RH |
Work / Pot Time Test Methods
Work / Pot Time | Test Method | Temperature |
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120 to 300 min | Bostik Method | 24°C |
Peel Strength Test Methods
Peel Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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>12 piw | 10,080 min | 25°C | 50 % | ASTM C 794, After 7 days cure at 77°F and 50% RH |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Cure Humidity | Test Method |
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230 psi | 10,080 min | 25°C | 50 % | ASTM D 412, After 7 days cure at 77°F and 50% RH |
UV Resistance Test Methods
UV Resistance | Test Method |
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Good | ASTM C 793 75 |
Modulus Test Methods
Modulus | Test Method |
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75 psi | 100%, ASTM D 412, After 7 days cure at 77°F and 50% RH |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
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35 | ASTM D 2240, After 7 days cure at 77°F and 50% RH | 25°C |
Density Test Methods
Density | Test Method |
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13.4 (lbs/gal) | ASTM D1475 |