Product Data Sheet Safety Data Sheet Show all documents

EVERBUILD TECNIC® PURAFLEX 25

overpaintable Low modulus PU adhesive and sealant

EVERBUILD TECNIC® PURAFLEX 25 one part Polyurethane Sealant is a premium quality one component low modulus sealant designed to replace conventional one part Polysulphide sealants in most applications.

  • Excellent adhesion to most building Substrates.
  • Over paintable - preliminary test required before use.
  • Solvent free and odourless.
Movement Factors Butt joints: 50% (not to exceed +/- 25% in any one direction)
Lap joints: 100% (not to exceed +/- 50% in any one direction) Slump ISO7390 Nil UV/ Pollution resistanceExcellentE-Modulus0.3N/mm² @ 23°C ISO8339
Product Data Sheet Safety Data Sheet Show all documents

Usage

  • Most construction, expansion and dilation joints in brickwork, stone and concrete structures, vertical and horizontal.
  • Pointing and perimeter joints around timber window and door frames.
  • Capping to beaded glazing systems.
  • Sealing and pointing in roofline applications and to composite panels, metal panels and steel structures.
  • Sealing and pointing pre-cast concrete panels.
  • Light traffic floor joints.
 

Advantages

  • Excellent adhesion to most building Substrates.
  • Over paintable - preliminary test required before use.
  • Solvent free and odourless.
Movement Factors Butt joints: 50% (not to exceed +/- 25% in any one direction)
Lap joints: 100% (not to exceed +/- 50% in any one direction) Slump ISO7390 Nil UV/ Pollution resistanceExcellentE-Modulus0.3N/mm² @ 23°C ISO8339

Packaging

300ml cartridges and 600ml foil packs (Brown and Buff not available in 600ml foil pack)

Colour

White, Black, Grey, Brown, Buff

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

  • EN 15651-1 type FEXT-INT CC Class F25LM.
  • ISO11600 F25LM.
  • ASTM C920, Class 100/50
  • ISO 16938-1 non staining on marble
  • ASTM C 1248 non staining on marble
  • Passes LEED EQc 4.1, SCAQMD, Rule 1168 and BAAQMD, Reg 8, Rule 51
  • EMICODE EC1plusR, very low emissions
Product Information

Chemical Base

Polyurethane

Shelf Life

15 months

Storage Conditions

Store in cool, dry conditions between +5°C and +25°C.

Density

approx. 1.35g/cm³
Technical Information

Shore A Hardness

20

Movement Capability

+100 /-50% (ASTM C719)

+/- 25% (ISO11600)

Chemical Resistance

Water; Excellent.

Acids, bases, hydrocarbons; Good

Service Temperature

-40˚C to +70˚C

Joint Design

The joint width must be designed to suit the movement capability of the sealant. In general the joint width should be > 10 mm and < 40 mm. A width to depth ratio of approx. 2:1 must be maintained. Reduce joint depth with EVERBUILD FIX AND FILL FOAM, EVERBUILD JOINT BACKER ROD or BOND BREAKING TAPE in cases where there is not enough depth to use Backer Rod.

Joint widths are calculated as in BS6213:
Width = (M x 100)/F + M
Where M = movement and F = movement accommodation Factor

Application

Application Information

Ambient Air Temperature

+5˚C to + 40˚C

Curing Time

3mm/ day

Skin Time

70 mins at 25˚C 50% RH
Consumption

Consumption

Joint size in mm

Litre per metre run

Metre per 310ml tube

5 x 5

0.025

12.4

5 x 10

0.050

6.2

10 x 10

0.1

3.2

15 x 100.152.1
20 x 100.21.6
Application steps

APPLICATION INSTRUCTIONS

PRIMER

On new concrete use Sika Primer - 3N.

SUBSTRATE PREPARATION

All surfaces must be clean, dry and dust free. Any loose or flaking surface coating should be removed before application.

Documents