MasterSeal 345 – Waterproofing membrane

How does MasterSeal 345 work?

MasterSeal 345 membrane is a sprayable membrane for waterproofing concrete structures and water management. MasterSeal 345 membrane is spray-applied between layers of sprayed or cast-in-place concrete or as a stand-alone membrane. MasterSeal 345 membrane exhibits high bond strength to the substrates on both sides of the membrane with good elasticity.

MasterSeal 345 membrane can be directly applied to damp sections of substrate.

Recommended for use in:

  • Cast-in-place or precast
  • Composite-designed sandwich structures (concrete/membrane/ concrete)
  • Underground structures with complex profiles and geometry
  • Bonds to steel and most sheet membranes and enables interface solutions with other waterproofing methods

What are the unique features of MasterSeal 345?

  • Dry-process material, ready-for-use
  • Elasticity 80-140% between -4 and 68 ºF (-20 and 20 ºC)
  • Fast curing – in 4 to 6 hours (depending on environmental conditions)
  • No toxic components
  • Environmentally preferable – non-toxic

What are the benefits of MasterSeal 345?

  • Easily applied by spraying with standard equipment
  • Two-sided bond with sprayed-concrete allows for composite behavior
  • Fast curing prevents disruption of construction operations
  • The fully bonded system provides excellent water tightness, preventing development of water migration in both concrete membrane interfaces

MasterSeal 378

- Acrylic waterproofing membrane for solar reflective membrane system

MasterSeal 501/502

- Deep penetrative, reactive, capillary waterproofing system for concrete and mortar

MasterSeal 505

- Ultra-rapid setting mortar to plug active water leaks in concrete and masonry

MasterSeal 530

- Surface applied capillary waterproofing for concrete and mortar

MasterSeal 540

- Flexible, cementitious waterproofing membrane

MasterSeal 898

- Rapid curing, chemical resistant & waterproofing membrane

MasterSeal 901

- Vinyl Ester Methacrylate resin for crack injection via injection hoses and packers

MasterSeal 909

- Re-injectable hose waterstop system for construction and cold joints in concrete

MasterSeal CR 170

- 2-component joint sealant, non-sagging, polysulphide-based, chemical resistant with European Technical Approval

MasterSeal CR 171

- 2-component joint sealant, pourable, polysulphide-based, chemical resistant with European Technical Approval

MasterSeal CR 460

- Polyurethane joint sealant

MasterSeal GG 470

- High Performance, Elastomeric Joint Sealant (Gun Grade)

MasterSeal M 388

- Solar radiation reflective waterproofing system top coat

MasterSeal PG 470

- High performance, elastomeric joint sealant (Pouring Grade)

MasterSeal Traffic 2205

- Exposed, crack bridging, skid resistant, car park deck waterproofing system with spray applied membrane

MasterSeal Traffic 2255

- Trafficable waterproofing system for parking floors

MasterSeal Traffic 2262

- An exceptionally hard wearing coating system

MasterSeal Traffic 2271

- Economical glossy car park deck coating system

MasterSeal 345

– Waterproofing membrane

MasterSeal 550

- Flexible, cementitious waterproofing membrane

MasterSeal 581

- A waterproof cement-based coating for concrete and masonry

MasterSeal 590

- One-component, cement-based, fast-setting water-stop repair mortar

MasterSeal 600

- Special formulation of acrylic polymers and modifiers designed for use as an additive for cement mixes and other highly-alkaline building materials

MasterSeal 910

- Water swelling waterbar for joints

MasterSeal 912

MasterSeal HLM 5000

- Liquid, cold-applied elastomeric waterproofing membrane system

MasterSeal NP 472

- One part polyurethane based elastomeric joint sealant

MasterSeal NP 474

- Single component, high modulus polyurethane joint sealant for floors

MasterSeal Roof 3500

- Liquid applied crack bridging waterproofing membrane

MasterSeal Traffic 1500 MD

- Medium duty traffic deck crack-bridging waterproofing system

MasterSeal Traffic 2000 HD

- Traffic deck crack-bridging waterproofing system

MasterSeal Traffic 2500 HD

– Fast return to service Traffic deck crack-bridging waterproofing system


MasterSeal 345: Technical Data Sheet

pdf (73.70 Kb)