Krystol Mortar Admixture™ (KMA)

Product Code:K-309


Krystol Mortar Admixture (KMA) is a hydrophilic crystalline admixture used to provide long-term protection of masonry mortars and concrete masonry units against water and waterborne contaminants by reducing permeability and absorption of the mortar.

KMA simplifies installation by removing the need for surface applied sealers and is easily incorporated into the existing mix-design and application processes. KMA provides superior waterproofing performance that lowers building maintenance and repair costs.

KMA contains Krystol technology. When added to cementitious mortars or concrete masonry units, Krystol chemically reacts with water and un-hydrated cement particles to form insoluble needle-shaped crystals that fill capillary pores and micro-cracks in the concrete and block the pathways for water and waterborne contaminants. Any moisture introduced over the lifespan of the concrete will initiate crystallization, ensuring permanent waterproofing protection.

Features & Benefits

Recommended Uses

Use KMA to provide permanent protection for:


Physical Properties
Appearance Light, off-white powder
Bulk density (g/cm³ (lb. /cu. ft.) 0.7 (44)
pH (dissolved in water) 12
Plastic Properties
Water Reduction ASTM C270
Standard Specification for Mortar for Unit Masonry
Approximately 5% water reduction
Hardened Properties
Water Absorption, BS EN 480-5
Determination of Capillary Absorption
50% reduction in water absorption compared to control
Permeability, DIN 1048:
Part 5 – Permeability of Hardened Concrete
No leakage or dampness
(10 days constant pressure of 0.5 MPa, 72.5 psi)


Detailed application instruction can be found in Application Instruction 6.11 — Protecting Masonry Mortar or Application Instruction 6.21 — Protecting Rendering & Plastering Mortar before using this product.

Dose KMA at 2% by weight of cement. When dosing on the jobsite, measure and add 1 liter (1 quart) of tightly-packed KMA for each 40kg (88 lb.) bag of cement in your mortar mix. Mix well. Reduce water if necessary. It is designed to be used with existing mix design and installation practices. Proper curing is essential to achieve the performance and benefits of KMA.


KMA is an effective system for rigid structures only and may not resist water for mortar that experiences variable loading or repeated movement. Consult a Kryton representative for project specific recommendations.


Read the Safety Data Sheet (SDS) for this product. For professional use only. Avoid contact with skin or eyes. Avoid breathing dust. Wear a dust mask, long sleeves, safety goggles and impervious gloves.


Krystol Mortar Admixture is available in 15 kg (33 lb.) resealable pails.

Shelf Life

When stored in a dry enclosed area, KMA has a shelf life of 3 years for unopened pails and 4 months for properly resealed pails.


Kryton International Inc. (Kryton) warrants that Kryton products are free from manufacturing defects and comply with the specifications given in their respective technical data sheet. Because conditions of use, such as site conditions, surface preparations, workmanship, concrete ingredients, weather, structural issues and other factors are beyond the control of Kryton, no warranty can be given as to the results of use. Purchaser agrees to seek the advice of qualified professionals and to determine for themselves the suitability of the products for their intended purpose and assumes all risks. Purchaser’s sole remedy is limited to replacement of any product proven defective or at Kryton’s option refund of the purchase price paid. THIS LIMITED WARRANTY CONTAINS THE ENTIRE OBLIGATION OF KRYTON. NO OTHER WARRANTIES, EXPRESS OR IMPLIED, SHALL APPLY INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. KRYTON SHALL NOT BE LIABLE UNDER ANY LEGAL THEORY FOR SPECIAL OR CONSEQUENTIAL DAMAGES. No representative of Kryton has the authority to make any representations or provision except as stated herein. Kryton reserves the right to change the properties of its products without notice.