Desmoseal MASTIC-PU

MASTIC PU

Polyurethane mastic

MASTIC PU is a single component polyurethane mastic that cures rapidly on contact with atmospheric moisture, forming a hard sealant, elastic and of a medium-high elasticity modulus. For sealing of vertical and horizontal joints.

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Uses

  • Can be used for heavy and light precast panel expansion joints, wood, aluminum and PVC joinery seams, and expansion joints in traditional construction.
  • Is highly recommended for bonding baked clay and concrete roof tiles.
  • This sealant has a good adhesion without primer on other current materials: most lacquered metals, polyester, glass, stone, ceramic tiles.

NOTE: call our technical department about the application to other supports or situations

hardness Shore A at 23ºC ± 40
application temperature 5~35 ºC
frying tack 30~60 minutes
curing total thickness of 3 to 4 mm 24 hours
elongation at break  at 23ºC >600 %

APPLICATION METHOD

SUBSTRATES PREPARATION

  • The substrates must be clean, even, dry, free of dust, oil, grease and any contaminants that could harm bonding.
  • They may be cleaned with, methylethylketone (MEK), acetone or grease remover.
  • Apply a primer if necessary.
  • Check the compatibility of the solvent used with the substrates.
  • When using solvents, extinguish all sources of ignition and carefully follow the safety and handling instructions given by the manufacturer or supplier.
  • If necessary, rub down metal surfaces beforehand.
  • After rubbing down, the surface should be cleaned.
  • Allow the substrate to dry after degreasing.
  • We recommend cleaning concrete with a metal brush.

CAULKING

  • MASTIC PU can be applied by a manual or pneumatic gun.
  • After application, use a putty knife to smooth the joint with soapy water.
  • This product should be used within 24 hours of opening the cartridge or sausage; otherwise, the sealant could harden inside. Do not apply at a temperature under 5 °C.
  • In cold weather, store the cartridges at about 20 °C before use.
  • Avoid any contact with non-cured MS, hybrid PU or silicone sealants as well as with alcohols or ammonia during curing.

CLEANING

  • Tools should be cleaned with, MEK or acetone before the sealant has completely cured. After curing, abrasion is necessary.

SHELF LIFE

12 months in the original, hermetically sealed packaging between 5 and 35 °C

PACKAGING

Boxes of  20 ut. ( 600 cm³ each), on the gray color.

HANDLING

Not classified as hazardous. Read the material and safety data sheet before use. ( MSDS)

YIELD

Diameter of the application(mm)

2

3

4

5

6

7

8

9

10

Linear fleet (m)

190

85

47

30

21

15

11

9

7


TECHNICAL DATA

Appearance

pasty

Color

grey

Density at 23 °C   ISO 1675

1.18 ± 0.05

Sagging   ISO 7390

none

Application temperature

5 ~35 °C

Skin formation time at  23 °C and 50 % relative humidity

±70 min

Cure time at 23 °C and 50% relative humidity

3 mm/24 h

Shore A hardness (internal method IT-20 after ISO 868 - 3 seconds)

±40

Modulus at 100 %   ISO 8339

±0.4 MPa

Elongation at break   ISO 8339

 >500 %

Tear strength   DIN 53515

±10 N/mm

Temperature resistance

- 40 ~ + 80 °C

Resistance to dilute acids and bases

average

UV resistance

medium

Water and salt spray resistance

excellent

Compatibility with paints

water based: yes
solvent based: carry out tests beforehand

Specific data

modulus at 100 % (ISO 37) : ca. 0.3 MPa
modulus at break (ISO 37): ca. 1.4 MPa
elongation at break (ISO 37) : > 600 %