Bostik Chem-Calk 550

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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.

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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

Best Practices for Bostik Chem-Calk 550

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Technical Data for Bostik Chem-Calk 550

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Overview

Application Type
- Adhesive - Bond
- Sealant - Seal
1 Part or 2 Part
- 2-Part
Material Form
- Paste
Substrate
- Ceramic - Ceramics
- Concrete
- Porous Substrates - Porous
- Metal - Metals
- Steel
- Plastic - Plastics
- Wood
- Other - Marble
Industry
- Industrial - Control, Malls, Sealing expansion
- Construction - Driveways, Factory floors, Institutional floors, Patios, Pavements, Perimeter joints in parking decks, Plazas, Masonry
Chemistry
- Polyurethane
Cure Method
- 2-Part Cure - 2 Parts
Color
- Gray - Stone
- Other - standard colors (25), Uni-base
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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1. 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.
2. 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.
3. 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.
Comparable Materials for Bostik Chem-Calk 550

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- Chem-Calk 500(Bostik)
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