Nitoseal PY350: Hybrid Polyurea Joint Sealant

Product Overview

Nitoseal PY350 is a two-component hybrid polyurea, elastomeric rapid cure joint sealant specifically designed for sealing low movement and saw cut joints in concrete floors. This dual cartridge, gun-applied sealant cures very rapidly to form a durable, hard-wearing seal suitable for both internal and external applications.

Key Features and Advantages

Performance Characteristics

Nitoseal PY350 delivers exceptional performance through several key advantages:

• Very fast curing – enabling quick return to service time
• High Shore A hardness (80 ±3) – providing tough, wear-resistant properties
• Tough and abrasion resistant – seals and helps protect joint edges from wear
• Chemical resistant – excellent resistance to a wide range of chemical compounds
• Weather resistant – suitable for both internal and external environments
• Aliphatic formulation – providing UV resistance and colour stability
• Chemical cure – independent of ambient humidity and joint size
• Easy to gun out and tool to finish – enabling smooth application

Application Suitability

Nitoseal PY350 is ideally suited for:

• Retail and warehousing environments
• Industrial applications and bunds
• Heavy hard wheeled traffic resistance
• Repair of spalled joints and random crack repair
• Low movement construction and contraction joints

Technical Specifications

Physical Properties

Property	Value
Form	Non-slump thixotropic paste
Colour	Grey
Density (cured)	1.05 g/cm³
Mix Ratio	1:1 by weight or volume
Hardness	80 (±3) Shore A (ASTM D2240)
Tensile Strength	17 MPa (ASTM D412)
100% Modulus	3.1 MPa (ASTM D412)
300% Modulus	5.3 MPa (ASTM D412)
Elongation at Break	780% (ASTM D2240)
Angle Tear Strength	54 kN/m (Die C) (ASTM D624)
DIN Resiliency	41% (ASTM D1817)

Performance Properties

Property	Specification
VOC Content	<1 g/litre (ASTM D2369)
Movement Accommodation Factor	+5% / -5% (10% total)
Physical/Chemical Change	Chemical cure (non-acidic)
Application Temperature	Minimum 5°C (joint must be dry and frost free)
Service Temperature Range	-20°C to +80°C

Cure Times (at 25°C)

Stage	Time
Tooling Time	4 minutes
Shave Time	30 to 50 minutes
Tack Free Time	75 minutes
Light Traffic	90 minutes
Full Cure	2 hours

Design Criteria and Joint Specifications

Nitoseal PY350 should only be used in very low movement construction/contraction joints where anticipated movement is less than 5% of the joint width. It is not designed for sealing expansion joints.

Recommended Joint Dimensions

• 6 to 12mm wide: depth equal to width (1:1 ratio)
• 13 to 24mm wide: 12mm depth
• Over 25mm wide: depth is half the width (2:1 ratio)

Joints should only be sealed after initial shrinkage has occurred in new concrete, typically after 90 days.

Chemical Resistance

Excellent Resistance (Little or No Effect)

Ammonium Hydroxide, Boric Acid, Calcium Chloride, Calcium Hydroxide, Castor Oil, Glycerine, Greases, Hexane, Mineral Oil, Petroleum, Tartaric Acid, Vegetable Oil

Good Resistance (Minor to Moderate Effect)

Ammonia, Animal Fats, Benzoic Acid, Butyl Alcohol, Chlorine, Citric Acid, Cyclohexane, Ethylene Glycol, Ferric Chloride, Hydrochloric Acid 20%, Hydrofluoric Acid, Hydrogen Peroxide, Isopropyl Alcohol, Sodium Dichromate, Sodium Hydroxide 45%, Sodium Nitrate, Transformer Oil, Trisodium Phosphate, Urea, Zinc Chloride

Fair Resistance (Moderate to Severe Effect)

Acetic Acid, Ammonium Acetate, Chromic Acid, Ethyl Alcohol, Ethyl Bromide, Ethyl Chloride, Hydrogen Sulphide, Phosphoric Acid (Conc.), Turpentine, Xylene

Poor Resistance (Not Recommended)

Acetone, Benzene, Butyl Acetate, Ethyl Acetate, Methyl Alcohol, Methyl Ethyl Ketone, Methyl Chloride, Nitric Acid, Skydrol Oil, Sodium Hypochlorite 5%, Steam, Toluene, Trichloroethylene

Supply and Availability

Standard Packaging

• Nitoseal PY350 Grey 600ml: Dual 300ml cartridges (FC920125-600ML), supplied in cartons of 10

Made-to-Order Products

• Lead Time: 14-21 days (minimum order quantity: 20 kits)
• Nitoseal PY350 Part A 20kg: FC920123-20KG
• Nitoseal PY350 Part B 20kg: FC920124-20KG
• Yield: Each 40kg pack yields approximately 38 litres of mixed product

Coverage Rate

Each 600ml pack of Nitoseal PY350 will seal 4.2 metres of a 12mm wide × 12mm deep joint.

Application Equipment and Ancillaries

Primary Application Tools

• Fosroc Polyurea WCS Manual Gun: FC007087-UNIT
• Nitoseal PY350 Static Mixer: FC920126-UNIT

Priming Products

• Primer 13 (250ml pack): Base FC965229-125ML / Hardener FC965230-125ML
• Primer 13 (1 litre pack MTO): Base FC965229-500ML / Hardener FC965230-500ML

Equipment for Large Kits

For dispensing 40kg kits, a Graco E10 pump is suitable when used with an appropriate gun fitted with the Nitoseal PY350 Static Mixer nozzle.

Storage and Shelf Life

Nitoseal PY350 has a shelf life of 12 months when stored in unopened containers under cool, dry conditions.

Application Limitations

Nitoseal PY350 should not be applied in close proximity to:

• Bituminous materials
• Products containing reclaimed rubber (such as some tile adhesives)

Additionally, Nitoseal PY350 is not suitable for expansion joints in concrete due to the product's limited movement accommodation capacity.

References

• [1] Fosroc_Nitoseal_PY350_TDS.pdf