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
Technical Data for Bostik GPS1
- Sealant - Seal
1 Part or 2 Part
- 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
- Moisture / Condensation Cure - Moisture
- Brown - Limestone
- Gray - Stone, Light Gray
- Yellow - Bronze
- ASTM (American Standard Test Method) : C920 : Class 25 - ASTM C920, TYPE S, GRADE NS, CLASS 25, USE NT, A AND M
Cure Temperature (°C) 25 Cure Time (min) 20,160 Viscosity (cPs) Non-sag Tack Free Time (min) 60 Test Method
Tensile Strength (psi) 135 Test Method
High Temperature Resistance (°C) 65 Low Temperature Resistance (°C) -40
Shore A Hardness 35 Test Method Elongation (%) 550 Test Method Flexibility Flexible
Flash Point (°F) 143.6
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
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).
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.
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.
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Tack Free Time Test Methods
|Tack Free Time||Test Method|
|60 min||Bostik Test, ambient conditions|
Tensile Strength Test Methods
|Tensile Strength||Cure Time||Cure Temperature||Cure Humidity||Test Method|
|135 psi||20,160 min||25°C||1 %||ASTM D 412, After 14 days cure at 77°F and 50% RH, @ break|
Elongation Test Methods
|550 %||Break, After 14 days cure at 77°F and 50% RH, ASTM D 412|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method|
|35||After 14 days cure at 77°F and 50% RH, ASTM D 2240|