Monolithic Membrane 6125® - Waterproofing

Monolithic Membrane 6125® (MM6125®) is a hot applied rubberized asphalt for use in waterproofing. MM6125® is a thick, tough, flexible and self-healing membrane. It has been successfully used worldwide by leading architects, engineers and owners on all types of horizontal and vertical structures including plazas, parking decks, fountains, water basins, planters, tunnels, bridges, mud slabs, foundation walls, roofs and vegetative roofs. MM6125® has an unbeatable track record of more than 50 years.

MM6125® has many unique characteristics:

  • MM6125® conforms to all surface irregularities and bonds tenaciously to an acceptable substrate (i.e., concrete, steel, wood, etc.) eliminating lateral migration of water.
  • MM6125® is completely monolithic; no seam.
  • MM6125® is typically installed at 6 mm thick in the fabric reinforced Assembly. This is more than three times thicker than most other waterproofing membranes. Thickness is an important benefit in that MM6125® exhibits the ability to self-heal and better accommodates developing cracks in a concrete substrate.
  • MM6125® is a homogeneous mixture of refined asphalts, synthetic rubber and mineral inert filler.
  • MM6125® contains 40% post-consumer recycled material.
  • MM6125® has no VOC. No solvent means no on-site cure failures, no two part mixing.
  • MM6125® can be installed at temperatures as low as -18°C (provided the substrate is clean, dry and free of snow and frost).
  • MM6125® detailing is simplified, with triple protection at all critical locations.
  • MM6125® is ideal for dead level installations; no slope required.
  • MM6125® was developed to perform in a wet (submerged) environment.
  • MM6125® tie-ins from one day's work to the next are easy, perfect for phased construction.

One of the reasons MM6125® has been so successful in the marketplace is that it can only be installed by "trained" authorized Hydrotech applicators.  MM6125® is sold direct, not through a distributorship.

MM6125® Approvals/Certifications:

  • Manufactured under ISO 9001-2015
  • CAN/CGSB 37.50-M89 (Canadian General Standards Board)
  • Applicable ASTM Test Methods (American Society for Testing and Materials)
  • UL Class A Classification (Underwriter Laboratories)
  • UL Recycled Content Claim Validation
  • CSA Environmental Product Declaration
  • FM Approval (Factory Mutual)
  • Dade County, FL Approval
  • General Approval - City of Los Angeles
  • MEA Approval - City of New York

MM6125® Physical Properties Chart

MM6125® Physical Properties ChartShow




Flash point

ASTM-D-92, CGSB 37.50-M89

260°C (500°F) or not less than 25°C above temperature of max. recommended application

Crack bridging capability (-25°C)

CGSB 37.50-M89

No cracking, splitting or loss of adhesion

Water vapor permeance

ASTM-E-96, Procedure E CGSB 37.50-M89

1.7 ng/Pa.s m² maximum

Water absorption

CGSB 37.50-M89

Loss in mass Max. : 0.18 g , gain in mass Max. : 0.35 g

Toughness / Ratio of toughness to peak load

CGSB 37.50-M89

5.5 Joules min. / 0.04 minimum


CGSB 37.50-M89

2-15 seconds

Heat stability

CGSB 37.50-M89

After 5 h @ 196°C (385°F), product must pass the CGSB 37.50-M 89 specifications for the two penetrations, the flow, the low temp. flexibility and the viscosity

Low temperature flexibility (-25°C)

CGSB 37.50-M89

No cracking of material permitted

Cone penetration

ASTM-D-1191, CGSB 37.50-M89

Maximum 110 at 25°C (77°F), maximum 200 at 50°C (122°F)

Flow (60°C)

ASTM-D-1191, CGSB 37.50-M89

3.0 mm (0.12 inch) max.

Softening point

ASTM-D-36, CGSB 37.50-M89

82°C (180°F)

Resistance to acids (sulfuric solution 10%),(chlorydric solution 50%)

ASTM-D-896-84 Procedure 7.1, Note 8

Good – Excellent

Solid Content


100% - without solvant

Minimum ambient temperature for application


-18°C (0°F)

Specific Gravity




If you should have any questions regarding Hydrotech assemblies or if we can be of any assistance on your next waterproofing and/or roofing project, please don't hesitate to contact us.

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