MARIS Mariflex PU 30 PU sealant low-modulus 310ml cartridge

MARIS Mariflex PU 30 310 ml – low-modulus polyurethane joint sealant for movement joints

Mariflex PU 30 is a one-component, thixotropic, and permanently elastic polyurethane sealant with a low modulus of elasticity. It is applied cold, cures with atmospheric moisture, and permanently accommodates movements in expansion and connection joints. In the MARISEAL system, it is used for filling cracks and creating movement joints in roof waterproofing.

Scope of delivery: 310 ml cartridge, individually or in a box of 25 cartridges. Available in white or grey.

Advantages of Mariflex PU 30

• Low modulus – ideal for movement joints
• Very high elongation at break (600%)
• Weather, UV, heat, and frost resistant (−30 °C to +90 °C)
• Good adhesion to most building materials
• Resistant to cleaning agents, oils, fuels, and seawater
• Paintable with acrylic or emulsion paints
• EN 15651-1 (F-EXT-INT-CC) and EN 15651-4 (PW-EXT-INT-CC)

Typical application areas

• Expansion and movement joints in almost all building materials, indoors and outdoors
• Connection joints between wood, metal, aluminum, or PVC frames and masonry
• Crack filling prior to PU waterproofing such as Mariseal 250
• Walkable joints with low pedestrian traffic

Technical data

• Base: Polyurethane prepolymer, one-component, moisture-curing
• Elongation at break: 600%
• Modulus at 100%: 0.40 N/mm²
• Tensile strength: 1.2 N/mm²
• Hardness: 15–25 Shore A
• Skin formation: approx. 15 minutes (23 °C, 50% RH)
• Full curing: approx. 3 mm in 24 hours
• Recommended joint width: 10–30 mm, width : depth approx. 2 : 1
• Fire behavior: Class E
• Application temperature: +5 °C to +35 °C
• Shelf life: 12 months from production

Consumption

Consumption depends on the joint volume. Calculation example: One 310 ml cartridge is sufficient for approx. 6 linear meters for a joint of 10 × 5 mm, or approx. 1.5 linear meters for 20 × 10 mm.

Application of Mariflex PU 30

1. Prepare the joint

Flanks must be clean, dry, and load-bearing; concrete at least 28 days old, max. 5% moisture. Form the joint to a width of 10–30 mm and a depth of approx. half the width. Test compatibility in advance.

2. Priming (if necessary)

Only if adhesion is insufficient: prime absorbent flanks with Mariseal 710, and non-absorbent flanks with Aquaprimer, then allow to dry.

3. Backfilling

Insert a non-adhesive PE backer rod without holes to prevent bubbles from forming.

4. Application

Apply with a cartridge gun to ensure no air bubbles; fill narrow joints in one pass, wide joints in three passes.

5. Smoothing

Press against the flanks and smooth with soapy water and a jointing tool. Remove masking tape immediately. Can be painted over after full curing (test first).

Note: Light colors may change under UV exposure without impairing the seal. Contains isocyanates – for professional use only. All information is sourced from the technical data sheet of the manufacturer, Maris Polymers (version 24, 03/2024).