Bostik GPS1

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Description for Bostik GPS1

A one-component, moisture curing urethane sealant.

Application Type	Seal
1 Part or 2 Part	1-Part
Material Form	Paste
Substrate	Metal, Stone, Wood, Concrete, Dissimilar materials, Porous substrates, Vinyl, Galvanized steel, Anodized aluminum, Galvanized steel
Manufacturer	Bostik
Chemistry	water-free, Urethane, PVC, Polyurethane
Cure Method	Moisture
Cure Temperature (°C)	25
Cure Time (min)	20,160
Viscosity (cPs)	Non-sag
Color	Black, Limestone, Stone, White, Bronze, Light Gray
High Temperature Resistance (°C)	65
Low Temperature Resistance (°C)	-40
Key Specifications	ASTM (American Standard Test Method): C920: ASTM C920, TYPE S, GRADE NS, CLASS 25, USE NT, A AND M

Best Practices for Bostik GPS1

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Technical Data for Bostik GPS1

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Overview

Application Type
- Sealant - Seal
1 Part or 2 Part
- 1-Part
Material Form
- Paste
Substrate
- Concrete
- Porous Substrates
- Dissimilar Substrates - Dissimilar materials
- Metal
- Galvanized - Galvanized steel
- Vinyl
- Wood
- Anodized Aluminum
- Galvanized Steel
- Stone
- Other - Cedar, Fiber-cement board
Industry
- Construction - General purpose sealing of dissimilar building materials, Masonry
- Other - Indoor and outdoor applications, Roof penetrations, Soffit / Fascia sealing, Sealing roofing materials such as metal flashing, gutters, downspouts, roof tile and non-asphalt shingle, Critical vertical applications
Chemistry
- Solvent-Free - water-free, PVC
- Polyurethane - Urethane
Cure Method
- Moisture / Condensation Cure - Moisture
Color
- Black
- Brown - Limestone
- Gray - Stone, Light Gray
- White
- Yellow - Bronze
Key Specifications
- ASTM (American Standard Test Method) : C920 : Class 25 - ASTM C920, TYPE S, GRADE NS, CLASS 25, USE NT, A AND M

Specifications

Cure Specs

Cure Temperature (°C)	25
Cure Time (min)	20,160
Viscosity (cPs)	Non-sag
Tack Free Time (min)	60	Test Method

Bond Strength

Tensile Strength (psi)	135	Test Method

Material Resistance

High Temperature Resistance (°C)	65
Low Temperature Resistance (°C)	-40

Hardness

Shore A Hardness	35	Test Method
Elongation (%)	550	Test Method
Flexibility	Flexible

Other Properties

Flash Point (°F)	143.6

Business Information

Shelf Life (mon)	9

Not Good For

Don't Use For	damp, contaminated, loose surfaces, seal narrow joints, fillet joints and face nail holes, horizontal joints or traffic-bearing joints where abrasion resistance is required (walkways, driveways, runways, etc.), glazing applications
Don't Use With	marble, limestone, granite

Best Practices for Bostik GPS1

*See Terms of Use Below
1. 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 MSDS’s provided for these solvents before use. Bostik® Hand Towel and Specialty Sealant Remover 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).
2. Testing
  
  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.
3. Removal
  
  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.
Comparable Materials for Bostik GPS1

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Spec Engine^® Results
- Flex-511(Sika)
  A multi-purpose non-sag, elastic one-part sealant based on silane-terminated polymer technology, which cures on exposure to atmospheric moisture to form a durable elastomer. Resistant to UV radiation. Very low VOC/solvent free, silicone and PVC-free, Isocyanate-free.
- Chem-Calk 2020(Bostik)
  A one-component, moisture curable advanced urethane sealant that offers superior adhesion to vinyl siding, vinyl trim board, and a variety of dissimilar surfaces. It is suitable for most building materials including stone, masonry, wood, aluminum and a variety of other metals.
- Flex-221 SF(Sika)
  A solvent-free, 1-component, fast curing, polyurethane-based, elastomeric sealant. A moisture-cured, non-sag system. Remains permanently elastic, and is suitable for sealing materials with dissimilar coefficients of expansion.
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