Max Joint Elastic


(10kg Pail)

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MAXJOlNT®  ELASTlC is a two-component product. Component A is a liquid based on special synthetic resins. Component B, supplied in powder form, is a mortar based on a mixture of cements, additives and special aggregates .

When both components are mixed, an elastomeric product with high bond strength is achieved, suitable for sealing joints and cracks in concrete, pre-cast elements, mortars and bricks.

  • Sealing expansion joints with an in-service joint movem ent up to 15%.
  • Joints in permanent immersion in pipelines, water reservoirs, water treatment plants, etc.
  • Joints of concrete pref abricated elem ents and ceramic in façades and building construction.
  • Sealing of active cracks in concrete and masonry.
  • Pointing mortar on substrates subject to movement.
  • Allows movement capability of joint up to 15%.
  • Very high weather resistant and durability. No maintenance required.
  • Excellent adhesion on damp surfaces. No bonding agent needed.
  • Non-slump on vertical joints.
  • Suitable for joints in permanent contact with water.
  • Easy to apply and finish.
  • Non-toxic and non-flammable, environmentally friendly.
  • Can be painted once cured with the desired colour.

Joint size

Joint width must not be higher than 30 mm . Sealing depth should not exceed or be at least half of joint width.

Use polyethylene foam joint backing rod MAXCEL (Technical Bulletin nº 48), with a diameter 2 5 % greater than the joint width, in order to avoid stress of the bottom on MAXJOlNT® ELASTlC.

Substrate preparatio n

The surface to be sealed must be solid and clean, free of all traces of paint, efflorescence, loose particles, grease, form-stripping oils, dust, gypsum plaster, etc. Before applying MAXJOlNT® ELASTlC, dampen joint edge rem oving f ree-standing wate r.

Mix preparation

MAXJOlNT® ELASTlC is supplied as two pre-weighed com ponents. Pour the resin, component A, into a clean container and add the powder graduall y, com ponent B, while m ixing with a low speed mixing drill (400 – 600 rpm), until a homogeneous mixture free of lumps is achieved. Avoid excessive mixing time and do not modif y the proportions supplied between both components. Leave the mix to rest 2 minutes. Depending on relative humidity and temperature, pot life can vary between 30 – 60 minutes approxim atel y. After this time, re-mix to keep its workability but do not add water.


To improve the adhesion on surface, a prim er of component A applied by brush on the joint edge is recom mended. W hile the primer coat is still wet to touch, apply MAXJOlNT® ELASTlC into the joint by trowel, caulking gun or putt y knife. During the application, push against the bottom and edge joint in order to avoid any remaining internal air bubble. For smoothing the surface, soaped water can be used immediately after application .

Application conditions

Do not apply MAXJOlNT® ELASTlC below 5 ºC or if lower temperatures are forecast within 24 h after application. Do not apply onto frozen or frosted surfaces.

Prevent fast drying during the first hours of curing. Protect against strong wind or direct sunlight at high temperatures. Do not apply if rain is expected within 6-8 hours af ter application.


Curing time varies depending on temperature and relative hum idity, as well on the joint size.
At 20 ºC and 50 % R . H., a 10 mm width application of MAXJOlNT® ELASTlC can be coated by MAXSEAL FLEX (Technical Bulletin nº29), MAXELASTlC (Technical Bulletin nº18) or MAXSHEEN ELASTlC, (Technical Bulletin nº 142) after a curing time of 7 days.

When subject to water immersion, allow a curing time for 3 weeks, in such weather conditions. If application is done below 10 ºC, high relative humidity or not ventilated areas, longer curing time is required.


Tools must be cleaned with water immediately after application. Once the material hardens, it can only be removed by mechanical methods.


MAXJOlNT® ELASTlC is supplied in 10kg pre-weighed sets (5kg liquid component A and 5kg powder component B). It is available in standard grey colour.


Twelve months in its original unopened sets, in a dry covered place, protected from frost, above 5 ºC.


MAXJOlNT® ELASTlC fills approximately 0,790 litres with 1 kg product. The following data is an approximate guideline depending on the joint size:

Approximate Consumption
Joint size (mm) kg / lineal metre Lineal metre per 10 kg set
10 x 5 0,065 153
15 x 7,5 0,140 71
20 x10 0,250 40
25 x 12,5 0,400 25
30 x 15 0,570 17

Do not add cement, water or aggregates to MAXJOlNT ELASTlC to achieve higher coverage.

Do not apply MAXJOlNT ELASTlC below 5 ºC or if lower temperatures are forecast within 24 hours after application.

Do not apply onto frozen and frosted surfaces.

For f urther information, please consult our Technical Departm ent.

External appearance component A Milky white liquid
External appearance component B Grey powder
Density component A 1,0 g/cm3 ± 0,05
Density component B

0,9 g/cm3 ± 0,05

Maximum aggregate size component B 0,2 mm
Mixture proportion A + B 1:1 by weight
Density fresh mixture A + B 1,26 g/cm3 ± 0,05
Density cured mixture A + B 1,14 g cm3 / ± 0,05
Pot life A + B 30-60 min
Optimum application temperature 5 - 30 ºC
Joint unhitching None
In-service joint movement 15 %
Shore A Hardeness ISO 868 37
Elastic modulus 60% EN 28339 0,38 MPa
Tensile strength EN 28339 0,38 MPa
Elongation at break EN 28339 60 %
Elastic recovery EN 27-389 78 %

Component A: NON toxic, NON flammable. It is not classified as dangerous material for transportation. Component B: as all cement based product, is an abrasive and protective rubber gloves and safety goggles must be used when preparing the mix and during application. If any of the components or mixture gets in contact with eyes or skin, rinse with clean water, but do not rub. If irritation continues , consult a doctor. A Material Safety Data Sheet is available for MAXJOlNT ELASTlC on request or is down loadable from website. Disposal of the product and its empty containers must be according to official regulations . The proper disposal of the product is the responsibility of the user.