Description
M-CRETE 600 – Concrete Expansion Joint Filler
Is a pouring grade, two part, pitch free polyurethane sealant for internal and external expansion joint sealing. M-CRETE can be used for construction joints in concrete paved areas, docks, container depots, industrial factories, and warehousing.
The product has very high adhesion to most materials when used with a suitable epoxy primer.
M-CRETE 600 – Concrete Expansion Joint Filler is cold applied and is therefore economic to use on small run jobs such as remedial re-sealing of joints in busy areas such as loading yards and hardstanding’s.
Typical Uses
- Used for Sealing Construction & Expansion Joints in Concrete
Application Guide
- All joints should be completely dry and free from all traces of dirt, dust grease and any previous sealants and other foreign matter.
- Cleaning may be carried out by grit blasting, grinding, sawing or water jetting.
- Wire brush must only be used for the removal of filler boards.
- In all cases a clean bonding surface must be obtained.
- Joint sides must be parallel and straight. Spalled joints should be prepared with an appropriate repair mortar such as M-CRETE 200 – Heavy Duty Epoxy Screed
- Once all preparation work is complete, place into the joint a bond breaker or foam backing rod to form the correct cross section for the joint sealant. And to ensure M-CRETE 600 – Concrete Expansion Joint Filler does not bond to the base of the expansion joint.
- All joint faces should be primed with the M-CRETE 600P – Surface Primer, care being taken to ensure complete coverage.
- After priming allow half an hour for the solvent to evaporate. If application of M-CRETE 600 is delayed for more than 2 hours after priming, joints should be re-primed.
- Optimum performance will be achieved by sealing joints that are dry.
Prior to mixing please ensure the following:
- The base component is at a temperature between 15-25°C.
- Do not apply the material when the ambient or substrate temperature is below 4°C or less than 3°C above dew point.
- Mix both Part-A and part-B together in full units as supplied. For small quantities us a mixing ratio of 3.5:1 by volume or 4.5:1 by weight
- Stir the contents of Pack B and add the entire contents to Pack A and stir for a full five minutes, preferably using a slow speed electric drill (max 500 r.p.m.) with a mixer paddle, until a completely homogeneous mix is obtained.
- Take care to avoid including excess air.
- Mixing is made easier if the Pack B is added and mixed in two stages
Use all mixed material within 25 – 35 minutes at 20°C.
- Pour or gun apply immediately into the primed joint.
- Current practice requires that the sealant shall be poured to a level between 3mm (Summer) and 6mm (Winter) below the wearing concrete surface.
| Appearance | Base Activator | Black/grey liquid Amber liquid |
| Mixing Ratio | By weight: By volume: | 4.5:1 3.5:1 |
| Density | Base Activator Mixed | 1.35 1.05 1.28 |
| Solids Content | 100% | |
| Usable Life | 10°C 20°C 30°C | 90 minutes 45 minutes 22 minutes |
| Coverage per 4.5ltr | Joint depth x width x mm 10 x 10 10 x 15 10 x 20 10 x 25 10 x 30 15 x 15 15 x 20 15 x 25 15 x 30 20 x 20 20 x 25 20 x 30 25 x 25 25 x 30 | Liner metres 45.0 30.15 22.5 18.0 14.98 20.02 14.98 12.01 10.03 11.25 9.0 7.65 7.2 5.98 |
| Cure Times at 20°C | Foot Traffic Vehicles | 24 hours 36 hours |
| Storage Life | Unopened and stored in dry conditions (15-30°C) | 18 Months |
| Movement | Movement Accommodation Factor | +/- 25% |
| Adhesion | Tested to BS 5212 | 100% at 20°C |
| Resilience | Tested to BS 5212 95% | 95% |
| Hardness | Tested to ASTM D2240 | Shore A 25 |
| Chemical Resistance | The product resists attack by a wide variety of low concentration industrial chemicals: |
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