Loading...

Keeps Water Out

 

Roof Coatings

Elastomeric roof coatings and mastics formulated with Kraton™ G SEBS polymers combine long-lasting protection against water penetration and ponding with reduced total project costs. This next-generation, solvent-based coating formulations are low-viscosity, low-VOC systems and are easy to spray or trowel onto roof surfaces, offering excellent adhesion to a wide range of roofing substrates.  Kraton G SEBS-based coatings are highly elastic and durable, minimizing maintenance. Its excellent dirt-pickup resistance help maintain an aesthetically attractive, reflective and radiative surface.


Dirt Pick Up Resistance 

Coatings made with Kraton polymers resist dirt pick up to improve long-term durability and reflectance while delivering excellent water resistance and extremely low porosity. Water and stain resistance produces coating surfaces with better color retention. Hydrogenated polymers, such as Kraton™ G1643, also feature excellent UV resistance and good resistance to weathering, yellowing and staining for extended durability and service life.


Testing completed on Kraton G 1643-based coatings placed in iron oxide slurry for 500 hours demonstrated improved performance compared with typical acrylic formulations.

 

Radiative Properties

Coatings made with Kraton SEBS polymers exhibit excellent radiative properties. Testing showed best-in-class performance initial reflectance and emittance. Samples prepared with the Kraton G1643 starting point formulation exhibited:

  • Reflectance: 0.89 ASTMC1549
  • Emittance:    0.88 ASTMC1371

 

ASTM D6083 Test Data

       

Viscosity (@73.4°F #4, 6 RPM), cps

D2196

11,300

12,000 – 85,000

Volume solids, %

D2697

56.3

>50

Initial elongation (@73°F), %

D2370

683

100 min

Initial tensile strength (@73°F), psi

D2370

517

200 min

Tear resistance (die C), lbf/in

D624

192

>60

Permeance (20 mil, 73.4°F, inverted), perms

D1653

5.5

50 Max

Water swelling (20 mil film, 73.4°F, 168 hrs) %

D471

0

20 Max

Wet adhesion (galvanized, 168 hrs, 73.4°F)pli

C794/D903

14.8

2.0 Min

Wet adhesion (TPO single ply, 168 hrs, 73.4°F)pli

D4798

13.8

2.0 Min

Wet adhesion (EPDM single ply, 168 hrs, 73.4°F)pli

D2370

3.7

2.0 Min

Fungi resistance

D4798

0

0

Elongation (1000hrs @ 73°F) %

D2370

896

100 min

Low temp flex

D522

Pass

Pass

Appearance (1000 hrs accel weathering)

D4798

Pass

No cracking or checking

*Kraton is a registered trademark of Kraton Corporation 
Irganox, and Tinuvin are registered trademarks of BASF
Eastotac is a trademark of Eastman Chemical Company

 

Mastics manufactured using Kraton G SEBS provides roofing contractors with the flexibility to facilitate application and enable complete seam sealing. The mastics resist cracking, even after repeated high/low temperature cycling. Kraton G SEBS polymers can be used to formulate primers for low surface energy materials. Kraton G-based formulations are also well suited for waterproofing building envelopes.


Kraton coatings formulations can be installed in nearly any weather conditions, even at low temperatures and wet or humid environments. Kraton G SEBS polymers provide for rapid drying; second coatings can be applied within four hours on most projects. 


Feature and Benefits

  • Superior water resistance (resists ponding)
  • Permits application in humid, cold, and wet conditions
  • Extends coating life
  • Excellent adhesion to various roofing substrates
  • Reduces total installation costs
  • Can be formulated to meet lower VOC regulations or wider VOC formulation latitude

 

Used For:

  • Elastomeric roof coatings
  • Building envelope
  • Mastics
  • Primers for low surface energy materials

 

Products

  • Kraton™ G1643
  • Kraton™ MD1653
  • Kraton™ MD1648

 

Literature

 

Formulation

Starting Formulation - 250 g/L VOC at 53% solids

Component PBW % Weight Example

Component

PBW

% Weight

Example

Kraton polymer

222

21.5%

Kraton™ G1643*

Hydrocarbon resin (midblock)

105.5

10.2%

KristalexTM 3070*

Antioxidant

3.3

0.3%

Irganox™ 1010*

UV stabilizer

2.6

0.3%

Tinuvin™ 328/770*

Pigment

100

9.7%

Ti-Pure™ R-902*

Filler

117.65

11.4%

Imerys MW100

Solvent

145.55

14.1%

Aromatic 100

Solvent (Exempt)

335.4

32.5%

PCBTF

*Kraton is a registered trademark of Kraton Corporation 
Irganox, and Tinuvin are registered trademarks of BASF
Kristalex is a trademark of Eastman Chemical Company
Ti-Pure is a registered trademark of E. I. du Pont de Nemours and Company