Sikalastic®-870 BT

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

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

  • Good resistance to abrasion
  • Good resistance to specific chemicals
  • Very fast reactivity and curing time
  • Impermeable to liquids
Product Data Sheet Show all documents

Overview

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.
  • For applications other than in sewage systems contact Sika Technical Service.

Advantages

  • 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)

Refer to the current price list for available packaging variations.

Colour

Part A

Clear–light yellowish liquid

Part B

Medium brown liquid

Part C

Toner grey liquid

IMPORTANT

Discolouration and deterioration due to exposure to sunlight

When the product is exposed to direct sunlight there may be some discolouration and colour variation. Prolonged exposure to direct sunlight will cause deterioration.

  1. Always apply a UV resistant top coat if the Product will be left exposed to direct sunlight.
  2. Contact your Sika technical services for advice on selecting a UV resistant product.

Product Details

Composition

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 from direct sunlight and frost. Always refer to packaging.

Refer to the current Safety Data Sheet for information on safe handling and storage.

 

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 mass

100 %

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 6251)

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)

Application

Mixing ratio

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

Layer thickness

> 2 mm

Material 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 to overcoating

1–2 min at +23 °C

Consumption

1.10 kg/m² per mm thickness

EQUIPMENT

MIXING EQUIPMENT

  • Drum stirrer

APPLICATION EQUIPMENT

  • Air driven or electrical 2-component hot spray-equipment

SUBSTRATE QUALITY

Cementitious substrates 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 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.

The Product is applied with specific temperatures for each component. If the application equipment only has a single fixed temperature setting use +70 °C and conduct application trials before undertaking the full application.

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

CLEANING OF EQUIPMENT

Clean all tools and application equipment with Sika® 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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