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Sikalastic®-670 TC

1-component aliphatic polyurethane top coat for Sikalastic® roof waterproofing systems

Sikalastic®-670 TC is a 1-component, aliphatic polyurethane, UV-stable, solvent base, liquid, cold applied top coat, designed to provide a durable, colour stable reflective finish for Sikalastic® roof waterproofing systems.

  • Resistant to UV exposure – reflective and resistant to yellowing 
  • Highly elastic and crack-bridging – retains flexibility even at low temperatures
  • 1-component, easy to apply
  • Easily recoated – no stripping is required
  • Water vapour permeable – allows the substrate to breath
  • Good resistance to common atmospheric chemicals
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Usage

Sikalastic®-670 TC may only be used by experienced professionals.
  • UV-stable top coat for Sikalastic® roof waterproofing systems
  • Reflective top coat for excellent cool roof characteristics and solar roofs
  • Color stable aliphatic PU top coat for use on roofs exposed to ponding water
 

Advantages

  • Resistant to UV exposure – reflective and resistant to yellowing 
  • Highly elastic and crack-bridging – retains flexibility even at low temperatures
  • 1-component, easy to apply
  • Easily recoated – no stripping is required
  • Water vapour permeable – allows the substrate to breath
  • Good resistance to common atmospheric chemicals

Packaging

1.0 kg, 5.0 kg and 20.0 kg metal pails

Colour

White (others colours upon request)

Product Details

Product Information

Composition

Aliphatic polyurethane

Shelf life

12 months from date of production 

Storage conditions

The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5°C and +25°C. Always refer to packaging.

Density

~1.20 kg/l (at 20°C)

(ASTM D1475 / DIN 53217 / ISO 2811)

Viscosity

400 - 800 mPa*s (at 25°C)

(ASTM D2196-86)

Solid content by mass

~68 %
Technical Information

Shore D Hardness

40 N/mm2

(ASTM D2240 / DIN 53505 / ISO R868)

Tensile strength

40 N/mm2

(EN ISO 527-3)

Solar reflectance

Initial Solar Reflectance

0.79 (+/- 0.02)

                                   (ASTM C1549)

Thermal emittance

Initial Thermal Emittance

0.95 (+/- 0.01)

                   (ASTM E408)

Solar reflectance index

Initial SRI (Medium Wind)

99 (+/- 1)

           (ASTM E1980-11)

Service temperature

Minimum

-20°C

Maximum

+90°C

Application

Application Information

Ambient air temperature

Minimum

+5°C

Maximum

+35°C

Relative air humidity

≤ 80 % r.h.

Dew point

Beware of condensation. The substrate and uncured membrane must be at least 3°C above dew point to reduce the risk of condensation or blooming of the membrane finish.

Substrate temperature

Minimum

+5°C

Maximum

+35°C

Substrate moisture content

≤4 % pbw moisture content.

Test method: Sika®-Tramex meter, CM - measurement or Oven-dry-method.

No rising moisture according to ASTM (Polyethylene-sheet)

Tack free time

6 - 8 hours ( at +25°C)

Waiting time to overcoating

24 hours
Consumption

Consumption

0.2 - 0.6 kg/m2 in one or two coats, depending on traffic conditions.
Application steps

APPLICATION INSTRUCTIONS

EQUIPMENT

Substrate preparation equipment

  • High pressure power washer

Mixing Equipment

  • Electric single paddle mixer

Application Equipment 

  • Brush
  • Roller
  • Airless spray
 

SUBSTRATE PREPARATION

Confirm that the waiting /overcoating time has been achieved on the previously applied waterproofing system Sikalastic® base layer. The base layer must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings and loose material. Sikalastic®-670 TC must be applied within 3 days after the application of the base coat. If the overcoating time is exceeded, Sika® Reactivation Primer, Sika® Concrete Primer or Sikalastic®-1 C Primer PU must be applied at a consumption rate of ~100 g/m2. For detailed information regarding the application of Sikalastic® waterproofing systems please refer to the corresponding Product Data Sheet and Method Statement. 

MIXING

Prior to application, stir Sikalastic®-670 TC gently but thoroughly for 1 minute in order to achieve a homogeneous mixture. For mixing, an electric single paddle mixer (300-400 r.p.m.) with a spiral blade can be used. Over mixing must be avoided to minimize air entrainment.

APPLICATION

Sikalastic®-670 TC is applied in one or two coats by roller, brush or airless spray. Consuption is depending on traffic conditions, ranging from 0.2 - 0.6 kg/m2  in one or two coats. Prior to the application of Sikalastic®-670 TC the roof waterproofing systems must have been installed and cured sufficiently.

CLEANING OF EQUIPMENT

Clean all tools and application equipment with a suitable thinner (Xylene / MEK / Acetone) immediately after use. Hardened or cured material can only be removed mechanically.

 

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