Natural Hydraulic Lime 5.0
Natural Hydraulic Lime 5.0
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Natural Hydraulic Lime 5.0

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Hydradur® NHL 5


HYDRADUR ® is an eminently Natural Hydraulic Lime EN 459-1 - NHL 5 HYDRADUR ® is an eminently hydraulic lime binder produced from “cooking” limestone in a shaft kiln. Natural Hydraulic Limes are made today in much the same way as they have been for centuries. Natural Hydraulic Limes have unique qualities that have been tested by time and are unrivaled technically in their breathability and durability and for their inherent beauty.


Traditional Building repeat. HYDRADUR ®NHL 5 can be used for building, pointing, plastering both internally and externally out on most backgrounds. New construction either on its own with sand and additions or with cement or other hydraulic or pozzolanic materials for new construction.

Technical Data

Product Brochure

Mixing Ratio

1 part NHL to 4.5 part sand maximum


25 kg


HYDRADUR® NHL 5 is a natural hydraulic lime acc. to EN 459-1. It is produced through burning and staking a specifically selected shell limestone. The stabilizing process of HYDRADUR® NHL 5 is effected through carbonation and hydraulic hardening. HYDRADUR® NHL 5 is free from cement


• historic, cement- and gypsum-free natural hydraulic binder

• high sulfate resistance

• low-tension hardening process

• very good subsequent hardening properties

• no penetration of damaging salts into the masonry

• high elasticity and water retention capacity in mortar produced

• very good side adhesion at stone

• low elasticity module


For the production of plaster- and brick mortar in ecological, biological building construction, in the restoration and preservation of historic buildings.


Dry, if possible on wooden shelves and protected against draft.

Technical data

Bulk density: approx. 0.55 kg/dm3

free CaO: approx. 30%

SO3: approx. 0.5 %

Compression strength ( acc. to EN 459-2):

28 days: approx. 6.5 N/mm2

6 months: approx. 11.0 N/mm2

12 months: approx. 14.0 N/mm2

Safety instructions

HYDRADUR® NHL 5 reacts strongly alkaline with water, thus: Protect skin and eyes, rinse thoroughly with water in case of contact, immediately contact doctor in case of eye contact.

Quality-monitored production

HYDRADUR® NHL 5 is continuously tested in our plant laboratory within the scope of our in-house monitoring with respect to the fulfilment of composition and properties. This will ensure a uniform quality of the product. HYDRADUR® NHL 5 has the quality certificate „Building lime“ and is certified acc. to EN 459-1.