Nitomortar AP - Multi-Purpose Epoxy Adhesive Repair Paste

Product Overview

Fosroc Nitomortar AP is a versatile two-component epoxy adhesive repair paste designed for speedy and permanent patching repairs to concrete structures. The product combines a white resin base component with a black curing agent (hardener) that, when mixed together, form a grey compound ideal for structural bonding, concrete repair, and specialized adhesive applications.

Primary Uses

Nitomortar AP serves multiple critical functions in concrete maintenance and repair work:

• Concrete Repairs: Speedy and permanent patching repairs to concrete structures and cementitious substrates
• Structural Bonding: Bonding of precast concrete components and repair work requiring high strength
• Emergency Repairs: Emergency repairs to concrete structures and industrial floors in chemical handling and process areas
• Adhesive Systems: Primary adhesive component within the Nitofill LV crack injection system
• Joint Sealing: Adhesive for the Expoband F bandage system, bonding waterproofing membranes to concrete
• Surface Preparation: Filling unfilled voids and blow-holes in concrete before epoxy coating applications
• Anchor Setting: Setting starter bars, dowels, holding down bolts, and anchoring applications

Key Advantages

• Excellent resistance to abrasion and impact - provides durable long-term protection
• Chemical Resistance: Unaffected by a wide range of acids, alkalis, and industrial chemicals
• Two-Pack Color Coding: Provides visual verification of correct mixing proportions
• Quality Control: Pre-weighed, quality-controlled materials ensure consistency and reduce site errors
• Damp Surface Tolerance: Can be applied to saturated surface dry (SSD) concrete
• Superior Slump Resistance: Excellent slump resistance up to 15mm thick, maintaining structural integrity during application
• Potable Water Approved: Tested and approved to AS4020:2018 standards
• Minimal Shrinkage: Cures with minimal shrinkage to a very strong, dense solid

Technical Specifications

Mix Properties

Property	Value
Mix Ratio by Volume	2 parts base : 1 part hardener
Pot Life (3 litre mix at 25°C)	60 minutes
Initial Hardness	5 hours @ 20°C
Full Cure	7 days (below 20°C, curing time increases)
Minimum Application Temperature	5°C
Maximum Service Temperature	50°C
Specific Gravity (mixed)	1.7 (approx.)
VOC Content	7g / litre
Colour	Grey when mixed (may yellow/darken with sunlight or chemical exposure)

Mechanical Strength Properties

Property	Value
Compressive Strength @ 7 days	78 MPa
Compressive Strength @ 3 days	67 MPa
Compressive Strength @ 1 day	66 MPa
Flexural Strength @ 7 days	44 MPa (AS1012.11-2000)
Adhesion to Dry Concrete	>2.0 MPa (concrete cohesive failure - exceeds tensile strength of concrete)
Adhesion to SSD Concrete	>2.0 MPa (concrete cohesive failure - exceeds tensile strength of concrete)

Chemical Resistance

Nitomortar AP demonstrates excellent resistance to a comprehensive range of chemical environments:

Chemical	Concentration	Rating
Hydrochloric Acid	10%	Excellent
Hydrochloric Acid	20%	Excellent
Hydrochloric Acid	30%	Very Good
Citric Acid	10%	Excellent
Tartaric Acid	20%	Excellent
Sodium Hydroxide	30%	Very Good
Diesel Fuel/Petrol	100%	Excellent
Sulphuric Acid	10%	Excellent
Sulphuric Acid	50%	Very Good
Lactic Acid	10%	Excellent
Phosphoric Acid	50%	Very Good

Product Composition & Shelf Life

Available Pack Sizes

Nitomortar AP is supplied in two-component packs containing both base and hardener:

• 3 Litre Packs:

  • Nitomortar AP Base (product code FC320467-2L)
  • Nitomortar AP Hardener (product code FC320468-1L)

• 15 Litre Packs:

  • Nitomortar AP Base (product code FC320463-10L)
  • Nitomortar AP Hardener (product code FC320464-5L)

Storage Requirements & Shelf Life

• Nitomortar AP Base: 6 months shelf life from date of manufacture when stored in dry, cool conditions in original, unopened packs
• Nitomortar AP Hardener: 12 months shelf life from date of manufacture when stored in dry, cool conditions in original, unopened packs (slump resistance properties diminish after this period)
• Storage Temperature Range: 5°C to 30°C
• Note: High temperature and high humidity storage conditions may reduce shelf life

Application Instructions

Surface Preparation

Proper substrate preparation is essential for optimal performance:

• Remove all grease, oil, chemical contamination, dust, laitance, and loose concrete by scabbling or light bush hammering
• Concrete must be at least 14 days old prior to treatment
• Steel surfaces must be grit blasted to white metal
• Surfaces showing traces of oil must be degreased with a chemical degreaser prior to grit blasting

Mixing Method

• Transfer the entire contents of the hardener (black curing agent) into the base component (white resin)
• Mix thoroughly using a spiral stirrer for minimum 3-5 minutes until an even grey colour is achieved
• For part pack mixing, experienced applicators may elect to mix smaller quantities using the specified mix ratio (2:1 base to hardener), accepting responsibility for any off-ratio mixing

Application Methods

Nitomortar AP can be applied using different techniques depending on the application:

• Notched Trowel: For larger patch repairs and surface applications
• Putty Knife: For smaller repairs and detailed work
• Caulking Gun: For linear applications and joint filling

Application Steps

• Apply the mixed Nitomortar AP to a suitably prepared surface
• Bond surfaces should be held rigidly together until the material has set
• The material quickly cures to form a complete impermeable repair

Coverage Data

• Coverage Rate: Approximately 0.7 litres per metre (each mixed litre covers approximately 1m² at 1mm thickness)
• For Expoband F Applications: Approximately 0.35 litres per metre per side with 5mm encapsulation (35mm bonded width)
• Note: Coverage figures are theoretical; practical coverage may be reduced due to wastage factors and substrate variations

Cleaning & Removal

• Immediate Cleanup: All tools and equipment must be cleaned immediately after use with Fosroc Solvent 10
• Hardened Material Removal: Hardened material can only be removed mechanically

Standards Compliance

• AS4020:2018 Compliance: Nitomortar AP has been tested in conjunction with Expoband F to comply with potable water standards
• Reference: AWQC Report 312170 (copies available on the Fosroc website)

Safety Information

A Safety Data Sheet (SDS) is available from the Fosroc website and should be read carefully prior to use as application or performance data may change. In emergency situations, contact any Poisons Information Centre (phone 13 11 26 within Australia) or a doctor for advice.

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References

• [1] Fosroc_Nitomortar_AP_TDS.pdf
• [6] Fosroc_Nitomortar_908_TDS.pdf
• [9] Fosroc_Expoband_F_TDS.pdf