VELOSIT SL 502

Cementitious self-levelling underlayment with specified flooring and terrazzo-binder applications. Technical details are attributed to the archived VELOSIT source 0221. Confirm the current matching manufacturer documentation and project suitability before use.

Reviewed technical data

Recorded source values with stated conditions. This review does not establish a current product release or approval.

Packaging

25 kg watertight plastic bagvelosit sl 502 tds; 0221 pp. 4

Thickness

3–38 mmvelosit sl 502 tds; 0221 pp. 1, 3

Water addition, light grey/grey

4.5–5.0 L per 25 kgvelosit sl 502 tds; 0221 pp. 3

Water addition, anthracite

4.75–5.25 L per 25 kgvelosit sl 502 tds; 0221 pp. 3

Working time

30–40 minutes at 23 °Cvelosit sl 502 tds; 0221 pp. 3

Coverage

Approximately 11 kg/m² at 6 mm on a smooth substratevelosit sl 502 tds; 0221 pp. 4

Volume yield

Approximately 14 L cured mortar per 25 kgvelosit sl 502 tds; 0221 pp. 3

Substrate temperature

10–35 °Cvelosit sl 502 tds; 0221 pp. 4

Compressive strength in source tests

16 MPa at four hours; 52 MPa at 28 daysvelosit sl 502 tds; 0221 pp. 4

Storage

The archived sheet states 12 months in unopened original packaging at 5–35 °C, dry and protected from sunlight. Confirm the supplied batch and current manufacturer requirements.

Method of application

Prepare sound, rough, open-pore concrete. The source gives minimum adhesive/compressive substrate strengths of 1.5/25 MPa with specification-dependent exceptions. Measure moisture before selecting the primer: the source limits PA911 to its stated low-moisture conditions and specifies PR303 where moisture is higher or expected to increase. Use the recipe for the selected colour and application. Rake or pump within the stated thickness; the terrazzo procedure uses its own specified aggregate and mixing requirements. Do not overwater or cover untreated joints/cracks. Protect for 24 hours from direct sun, wind and temperature changes greater than 5 °C, even though water curing is not required.

Safety notes

Consult the current product safety data sheet and follow its handling measures before use. The archived technical sheet is not a substitute for an SDS.

For project selection and substrate-specific advice, contact technical support.

• The anthracite colour has a separate water allowance.
• Do not blend ordinary levelling and terrazzo recipes.
• Do not omit joints, substrate-moisture requirements or 24-hour protection.

• Water quantities vary by colour and use. Do not merge levelling and terrazzo recipes.
• Retain primer/moisture limits, 10-35 °C application and initial protection; avoid unconditional no-curing claims.

Confirm the exact supplied product, substrate, exposure and current TDS/SDS with technical support.