Nitoseal® MS300

• Suitable for forklift truck traffic.
• Suitable for saw cut and perimeter joints.
• Abrasion resistant.
• Withstands vehicular traffic.
• Single component.
• Fast rate of cure.
• Easy to apply at low temperature.
• Can be applied to damp substrates.
• Primer-less for most applications.
• Hard, but flexible sealant; resists picking and vandalism.

Nitoseal MS300 is suitable for sealing saw-cut and movement joints in internal floors, and external joints where abrasion resistance is required. It can also be used for external facade
joints where a tougher seal is required.

• Factory floors.
• Sports stadia terracing.
• Shopping centers.
• Warehouse and distribution depots.
• Concrete hardstanding areas.
• Prisons

Preparation - Joints in concrete should preferably be sawn. After sawing all saw slurry must be flushed away and the joint allowed to dry. When resealing the existing sealant should be removed from the joint and the arris cleaned back to sound clean concrete. Remove all debris. The joint surfaces must be dry, clean and frost free. Remove all contaminants by rigorous wire brushing, grinding or grit blasting. Any expansion joint filler must be checked to ensure it is tightly packed and no gaps or voids exist at the base of the sealing slot before positioning a bond breaker. Note: The use of a bond breaker is not required in expansion joints containing Hydrocell XL cellular polyethylene expansion joint filler. For construction or contraction joints a bond breaker tape or back-up strip should be used. Where a particularly neat finish is required, mask the face edges of the joint before priming/sealing and remove immediately after tooling is completed.

Priming - Fosroc Primer MS2 is required for joints that are to be intermittently or permanently immersed, or where the substrate is likely to be saturated (for example, externally). When using a primer, empty the entire contents of the hardener tin into the base tin and replace the base tin lid. Mix thoroughly by shaking for at least 2 minutes. Prime the joint face using a clean, dry brush. Avoid over application of primer causing puddles in the bottom of the joint. Nitoseal MS300 should be applied between 30 minutes and 4 hours after priming. If a joint is left unsealed for more than 4 hours, the primer should be removed by grit blasting or grinding and the joint re-primed. Do not split packs of Fosroc Primer MS2.

Application and Finishing - Cut end off sachet and place in Fosroc GX Gun. Fit nozzle and cut at 45o to a suitable size. Extrude the sealant firmly into the joint. Tool to the required finish (flush or recessed) within 5 minutes of application to ensure good contact between the sealant and the substrate.

Cleaning - Clean tools immediately after use with Fosroc Equipment Cleaner.

Guide to Sealant and Primer Quantities

Guide to Nitoseal MS2 Primer Coverage

• Do not apply at temperatures below 5°C.
• Not suitable for contact with bituminous materials.
• Whilst Nitoseal MS 300 has excellent adhesion to many types of residual sealant its use should not be considered a substitute for a good standard of joint preparation.
• In large joints ensure sealant is sufficiently cured before trafficking. In 40 mm joints this could be up to 10 days.
• Flush finished joints should not be used in locations where significant thermal movement may occur during service (e.g. external locations, particuarly areas subject to direct sunlight) as this can result in the sealant bulging above the joint surface when the joints contract.

• ISO11600 Type F 25HM: Classification of sealants for building construction.
• ASTM C920 Type S, Grade NS, Class 25.
• ASTM D2203-93: Standard test method for staining.
• BSEN 140-3:1995: Acoustics measurement of sound insulation in buildings.

Gray (special colors available on request).

Nitoseal MS300 - 600 ml sachets. 10 no. sachets per box.

Fosroc Primer MS2 - 0.75 liter packs.