Product Data Sheet Show all documents

Sikalastic®-870 BT

Fast curing liquid applied pure polyurea membrane with high acidic and alkaline chemical resistance

Sikalastic®-870 BT is a two part, elastic, polyurea liquid applied membrane. It features a high acidic and alkaline chemical resistance and a very fast curing time.

  • Almost immediate return-to-service time
  • Very good crack-bridging ability
  • Good resistance to abrasion
  • Good resistance to specific chemicals
  • Very fast reactivity and curing time
  • Impermeable to liquids
Product Data Sheet Show all documents

Usage

The Product is used as a:
  • Waterproof coating on concrete and cementitious screeds substrates
Please note:
  • The Product may only be used by experienced professionals.
 

Advantages

  • Almost immediate return-to-service time
  • Very good crack-bridging ability
  • Good resistance to abrasion
  • Good resistance to specific chemicals
  • Very fast reactivity and curing time
  • Impermeable to liquids

Packaging

Part A (Isocyanate)

200 kg drum (net)

Part B (Polyamine)

175 kg drum (net)

Part C (Colour)

15 kg container (net)

Colour

Part A

Clear –Light Yellowish liquid

Part B

Medium brown liquid

Part C

Grey liquid

IMPORTANT

Discolouration due to exposure to sunlight

When the product is exposed to direct sunlight there may be some discolouration and colour variation. This has no influence on the function and performance of the membrane. Contact your Sika technical services to check if a UV resistant product is required.

Product Details

Product Information

Chemical base

Pure Polyurea

Shelf life

Part A

12 months from date of production

Part B

12 months from date of production

Part C

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 +30 °C. Protect the Product from direct sunlight. Always refer to packaging.

Density

Part A

1.05 kg/L

Part B

1.00 kg/L

Part C

1.05 kg/L

Density values determined at +23 °C

Solid content by weight

100 %
Technical Information

Shore D Hardness

< 42

(JIS K 6253-1)

Resistance to Impact

No cracks or peels

(JIS A 6916)

Tensile Strength

> 18 N/mm²

(JIS K 6252-1)

Tear Strength

> 75 N/mm²

(JIS K 6252-1)

Service temperature

Performs in constant dry temperatures from -30 °C to +60 °C　

Permeability to Water Vapour

0 g

(JIS A 1404)

CHEMICAL RESISTANCE

Resistance to alkali

No bulges, cracks or peels

The Product is not resistant to biogenic sulphuric acid.

Application

Application Information

Mixing ratio

Part A : Part B + Part C = 1 : 1

Layer Thickness

> 2 mm

Product Temperature

Part A

+67 °C

Part B + Part C

+53°C

Ambient Air Temperature

Maximum

+40 °C

Minimum

- 5 °C

Relative Air Humidity

< 85 %

Dew Point

Beware of condensation. The substrate and uncured applied product must be at least +3 °C above dew point to reduce the risk of condensation or blooming on the surface of the applied product. Low temperatures and high humidity conditions increase the probability of blooming.

Substrate Temperature

Maximum

+50 °C

Minimum

0 °C

Curing time

24 hours at +20 °C

Gel time

15 s at + 23 °C

Waiting Time / Overcoating

1–2 min at +23 °C

Consumption

Consumption

1.10 kg/m² per mm thickness
Application steps

EQUIPMENT

MIXING EQUIPMENT

  • Drum stirrer

APPLICATION EQUIPMENT

  • Air driven or electrical 2K hot spray plural-equipment

SUBSTRATE QUALITY

Cementitious substrates (concrete / screed) must be structurally sound and of sufficient compressive strength (minimum 25 N/mm2) with a minimum tensile strength of 1.5 N/mm2.

Substrates must be clean, dry and free of all contaminants such as dirt, oil, grease, coatings, laitance, surface treatments and loose friable material.

MIXING

IMPORTANT

Do not dilute with solvent or water.

  1. Pour all the container of Part C into the drum of Part B
  2. Thoroughly stir the single drum of coloured resin using a drum stirrer to obtain a uniform colour.
  3. Heat all three parts: Part A +67 °C : Part B + Part C +53°C.
  4. Dose and mix with the spray equipment making sure constant air pressure is maintained.
  5. Regularly check and control the accuracy of the mixing and dosage. The proportioning equipment must be capable of consistently supplying the correct pressure and heat.

APPLICATION

IMPORTANT

Ventilation in confined spaces

Always ensure good ventilation when applying the Product in a confined space.

IMPORTANT

No application on unprimed or unlevelled substrates

Only apply the Product on primed or levelled concrete and screed surfaces.

IMPORTANT

No application on rising moisture

Do not apply on substrates with rising moisture.

 

IMPORTANT

No application on out-gassing substrates

Important: Do not apply on porous surfaces where significant moisture vapour transmission (out-gassing) will occur during application.

Apply the Product using air driven or electrical 2-component hot spray plural equipment.

CLEANING OF TOOLS

Clean all tools and application equipment withSika® Thinner C immediately after use. The application equipment must be cleaned and filled with Mesamoll. Hardened material can only be removed mechanically.

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