MASTERFLEX 815 for limited movement joints and gap filling
Description
MASTERFLEX 815 is a single component, ready-to-use, spatula or gun applied non sagging sealant. Based on a modified bitumen carried in hydrocarbon solvent, it cures to form a seal, with excellent adhesion to concrete, brickwork, asphalt and most construction materials.
Primary uses
MASTERFLEX 815 is ideally suited for sealing and filling gaps on roofs, pointing horizontal chases and for waterproofing membranes and felts.
Advantages
- Sealing around roof service pipes.
- Pointing between brickwork and roof flashings.
- Sealing leaks in gutters and roofing sheets.
- Sealing cracks in asphalt and felt roofing.
- Filling horizontal joints in concrete and asphalt where movement is not expected.
- Concrete duct joints.
Composition
MASTERFLEX 815 is based on a blend of rubber and high quality bitumens carried in hydrocarbon solvent to assist in ease of application. Black in colour and exhibiting a non slump consistency it cures by solvent release, to form a tough flexible waterproof seal.
Typical properties*
| Service temperature limits |
-20°C to +70°C |
| Application temperature |
10°C to 45°C |
| Specific gravity (minimum) |
0.98 at 25°C |
| Solids content (minimum) |
75% |
| Flash point (minimum) |
48°C |
| Consistency |
semi-stiff paste |
| Initial set at 35°C |
4 hours |
| Full cure at 35°C |
4 weeks |
| Movement Accommodation Factor |
Up to 8% of the total joint width (± 4% on each side) |
Packaging
MASTERFLEX 815 is available in 20 litre containers.
Directions for use
Surface preparation
Surfaces must be free from all dirt, dust and loosely adhering materials. Any oil and grease contamination must be removed. Surfaces must be DRY.
Masking
Prior to application of primer and sealant, masking tape is applied to adjacent sides of joints to protect building surfaces.
Priming
Under normal circumstances, priming is not required. However, for very dusty or friable surfaces, it is advisable to apply a coat of MASTERKURE 161. Similarly, for joints subject to continuous immersion, priming is recommended.
Application
By means of a spatula or trowel, remove contents of the can and apply to prepared joint profile. In vertical instances apply from bottom up.
Ensure sealant fills the entire volume of the joint.
Immediately tool the joint with a spatula or trowel to effect total contact with joint surfaces.
After application, smooth and compress the sealant into the joint by using a spatula or putty knife moistened with cleaning solvent. Where masking tape has been employed to keep clean building surfaces, it is advisable to remove it immediately the sealant has been finished (masking tape is stripped off by drawing the tape across the joint).
Curing time
Full cure is normally obtained 4 - 6 weeks after application when complete solvent evaporation has taken place.
Over painting
This can be carried out after full cure has taken place, However, please contact MBT Middle East's Technical Dept. on paint systems.
Cleaning
Tools and equipment should be cleaned with cleaning solvent.
Chemical resistance
Occasional spillage:
| Dilute acids |
Resistant |
| Dilute alkalis |
Resistant |
| Solvents |
Not Resistant |
| Petroleum fuels |
Not Resistant |
| Lubricants |
Not Resistant |
Storage life
12 months in sealed undamaged containers when stored in cool dry conditions.
Quality and care
All products originating from BASF's Dubai, UAE facility are manufactured under a management system independently certified to conform to the requirements of the quality, environmental and occupational health & safety standards ISO 9000, ISO 14001 and OHSAS 18001.
Estimation
A. Joint Depths should not exceed joint width.
B. Minimum joint widths - 6mm.
C. Maximum joint widths - 40mm.
| |
Joint Width mm |
| |
6 |
10 |
12 |
15 |
20 |
25 |
30 |
40 |
| |
6 |
27.70 |
16.60 |
13.80 |
11.10 |
8.30 |
6.60 |
|
|
| |
8 |
|
12.50 |
10.40 |
8.30 |
6.20 |
5.00 |
4.10 |
|
| Joint |
10 |
|
10.00 |
8.30 |
6.60 |
5.00 |
4.00 |
3.30 |
2.50 |
| Depth |
12 |
|
|
6.90 |
5.50 |
4.10 |
3.30 |
2.70 |
2.05 |
| mm |
15 |
|
|
|
4.40 |
3.30 |
2.60 |
2.20 |
1.60 |
| |
20 |
|
|
|
|
2.50 |
2.00 |
1.60 |
1.25 |
Above values indicate linear metre/litre.
05/95 BASF-ME revised 05/2002
* Properties listed are only for guidance and are not a guarantee of performance