Desmoseal MASTIC-PU

MASTIC PU

Polyurethane mastic

It 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.

It has CE marking on the basis of a statement made DoP Declaration of Performance (DoP) conforms to the regulations UE305/2011.



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MSDS, CERTIFICATES, APPROVALS...(link)
DoP 15651-4(PDF)

Uses

For application in the following situations:

  • sealing of expansion joints or fissures
  • make caulking in the joints between horizontal and vertical walls for previous preparations in liquid waterproofing
  • genera sealing for building materials: concrete, wood, aluminium, lacquered metal, polyester, glass, PVC, concrete and clay tiles, stone, ceramic stoneware
  • highly recommended for bonding fired clay and concrete tiles.

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

application temperature 5~35 ºC  (41ºF to 95ºF)
frying tack 30~60 minutes
curing total thickness of 3 to 4 mm 24 hours
elongation at break  >600 %

GENERAL SPECIFICATIONS

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

  • it can be applied by a manual or pneumatic gun. any trace of grease, paint or non-adherent coating must be removed.
  • 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. (41ºF)
  • In cold weather, store the cartridges at about 20 °C  (68ºF)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 (41ºF to 95ºF).

PACKAGING

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

HANDLING AND SAFETY

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

gray

Density   ISO 1675

1,18 ± 0.05  g/cm3

Sagging   ISO 7390

none

Application temperature

5 ~35 °C

Skin formation time 

±70 min

Cure time 

3 mm/24 h

Loss of volume       ISO 10563 <10%
Tear resistance           ISO 8340 modified pass
Adhesion/cohesion properties of deformation under tension maintained immersion in water at 28 days           ISO 10590 modified no break
Adhesion/cohesion properties of deformation under-maintained tension, immersion in saltwater at 28 days           ISO 10590 modified no break
Adhesion/cohesion tensile deformation properties maintained at -30ºC           ISO 8340 modified pass

Durability         ISO 8340/9047/10590

pass

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 %

Results were performed in the laboratory at 23ºC (73ºF) and 50% RH, under controllable conditions. These values may vary depending on the application, climatology, or substrate conditions.