What we do

GftK – A pioneer in the industry

For over 50 years GftK has specialized in the development and production of innovative high-end building chemicals for use in circulation areas of all kinds. Being a pioneer in the field of innovative mortar systems based on epoxy resins, GftK set a major industry milestone in 1985 with the introduction of the world’s first epoxy paving jointing mortar, vdw 800, designed for the simple, quick, environmentally friendly, and long-lasting jointing of paved areas.


We produce our high end products for the world market in our own manufacturing facilities in Rheinbach and Erfurt Germany.

Made in Germany

All GftK products are developed and manufactured exclusively at its wholly owned and operated facilities in accordance with ISO-9001. We are proud to confirm that all of our products are 100% developed and manufactured in Germany, where there is a long-standing reputation for engineering excellence, and which leads the world in the paving mortar industry.

Customer Service

PHNA LLC is based in San Antonio, Texas. We assist our clients with a commitment to service, support, and competent advice for homeowners and contractors alike. We offer continuous customer orientation to help you realize your project from planning to inception to completion.


  • Permeable Hardscape North America

Project Support

We at PHNA, together with local partners, have developed a concept that offers our clients the best possible assurance that your project is delivered to the highest possible standard. The advantage of using PHNA is our long experience in the industry and our ability to provide sector-specific advice to ensure you get the technical support you need for your project, no matter how large or how small.

Mobile App

Our mobile app is coming soon.

System Warranty

10 Year System Warranty

The PHNA/GFTK 10 year system warranty is a special advantage for any customer. Based on 50 years of experience manufacturing industry-leading building materials, we are confident that we are providing the highest quality products to our clients.


Our Partners

SHS Distributors is a wholesale company focusing primarily on hardscape dealers

PHNA Highlights and see sophisticated products

Here you find a selection of our top selling products

Xtreme Easy

Our DIY permeable joint compound

  • No mixing
  • No waste
  • No hazing
  • Can even be applied in light rain

Vario Sand

  • For light and medium traffic loads
  • For joint width from 1/16
  • Permeable
  • No hazing
  • No mixing


  • For light to medium traffic loads
  • For joint widths from 1/8"
  • Water permeable
  • Highly frost and de-icing salt resistant
  • Very free flowing
  • Can be applied to ground temperatures of > 32°F


  • For light to medium traffic loads
  • For joint widths from 3/8"
  • Water permeable
  • Self compacting
  • Can be applied to ground temperatures of > 32°F
  • Can be applied in the rain

Xtreme plus

  • For medium to heavy traffic loads
  • For joint widths from 1/4"
  • Slightly water permeable
  • Self-compacting
  • Can be applied in the rain
  • Quick re-opening to traffic
  • Can be applied from > 32ºF surface temperature
  • No whitening

Xtreme Ceramic

  • For light to medium traffic loads
  • For flags and slabs, especially designed for ceramic tiles
  • Water permeable
  • Self compacting
  • Can even be applied in light rain and at low temperatures
  • No resin film
  • No whitening
  • Highly abrasion and mechanical sweeper resistant

Xtreme Gravel Lock

  • For pedestrian and light traffic loads
  • Highly water permeable
  • Ideal for pathway construction and tree pits
  • For professional use
  • Strengthens gravel and grit (grain size from approx. 1/16" - 1/2")
  • High strength
  • Can be applied from > 32ºF surface temperature
  • No weed growing

Xtreme Grit plus

  • For light to medium traffic loads
  • For any type of grit and gravel includes fines
  • Water permeable
  • Very durable and frost-resistant
  • Can be applied to ground temperatures of > 50°F

Xtreme Trassbedding Compound

Frost resistant drainage mortar

  • For medium to heavy traffic loads
  • Prevents frost damage
  • No efflorescence
  • Highly water permeable
  • Compressive strength 35 N/mm2odd

Xtreme Adhesion Elutriant

  • For light to heavy traffic loads
  • Extremely durable
  • Can be applied to ground temperatures of > 41°F

Stone Protect 3 in 1

  • For natural stone and other paving substrates
  • Grouting relief for subsequent jointing with resin binder
  • Hydrophobic – water repellent
  • Oleo phobic – oil repellent
  • Reduces staining and contamination for easy care
  • Vapor permeable
  • Solvent free
  • Quick drying
  • Suitable for use on sensitive stone before the grouting

10 Year warranty

OUR 10 YEAR SYSTEM WARRANTY! will protect your Project…!

  • Squares!
  • Paths!
  • Public Areas!
  • Streets
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