Historic Masonry and Grouting Mortar MG IIa, coarse, 25 kg

Article Number
€22.25 €18.70
Base Price: €0.75 / 1 kg 19 % VAT excl. (All prices without shipping)
2 - 3 days
Weight: 25.0000 kg
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H315, H318
Safety Instructions:
P102, P280, P305+P351+P338+P315, P302+P352, P261+P304+P340, P501


Otterbein MG II Mörtelgruppe / mortar group: M 2,5, EN 998-2, NM IIa, DIN V 18580.

Feine Körnung / grain size fine: 0 - 2 mm.

Based on natural hydraulic lime. For masonry and grouting.


Otterbein HMF - MG IIa consists of natural hydraulic lime NHL 5 acc. to EN 459-1, sulphate-resistant ce ment acc. to DIN 1164 and grain- classified crushed lime sands.


  • grading curve accordi ng to historic findings
  • free from synthetic additives
  • frost-proof
  • high natural water re tention properties
  • very good side adhesion
  • permeable
  • low-tension hardening process


For laying bricks and grouting of hist oric masonry (e.g. natural stones, bricks).


The substrate must be dry, clean and free from loosely attached particles. Sufficiently wet absorbing masonry before.


To be mixed with all commonly used mortar mixers (continuous mixer, gravity mixer, blunger) and by hand. Watch for uniform and correct setting of consistency (well earth-moist to plastic).

New construction of masonry: For the simultaneous bricklaying and grouting.

Subsequent grouting to re novate existing masonry:
Scrape out joints and clean.
Working procedure acc. to DIN:
1st working step: first vertical joint, then horizontal joint
2nd working step: first horizontal joint, then vertical joint
Joint finishing through smooth finish or broom finish or sand blasting.


Protect fresh mortar until sufficient hardening against premature drying- out through sun radiation and draft (e. g. hinge with jute sheets kept moist or spray with mist nozzles). The mortar must be protected against frost until sufficient hardening has been achieved!

Special notes

The air- and surface temperature mu st al least amount to 5 °C during processing. Otterbein HMF - MG IIa shall only be used in the original state without additives.


Dry, if possible on wooden shelves an d protected against draft. Storage time shall not exceed 6 months.

Technical data

Mortar group: M 5 acc. to EN 998-2 NMIIa acc. to DIN V 18580
Grain size: 0-1.6 mm or 0-4 mm
Solid mortar raw density: approx.1.65 kg/dm³
Compressive strength 28 days: approx. 5 N/mm²
Flexural strength 28 da ys: approx. 2,0 N/mm²
E-Module: approx. 7,5 kN/mm²

Safety instructions Mortal will react very alkaline with water, thus: Protect skin and eyes, rinse thoroughly with water in case of contact, immediately contact doctor in case of eye contact.

© Deffner & Johann GmbH