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FAQ
General product questions
Should I use a primer before applying silicone or adhesive?
On a dry, dust- and grease-free surface it is in most cases not necessary to use a primer.
What is the best way to clean my surfaces?
Surfaces can be degreased with Parasilico Cleaner or a fire alcohol, MEK or ethanol.
Upon opening the tube, I see a small layer of oily liquid?
This phenomenon can occur sporadically and is called leaching.
What is the lifespan/durability of my product?
All DL Chemicals' cartridges, foils, spray cans and buckets are marked with an expiry date. How long can I keep an opened cartridge? And can I still use expired product?
Sealants
What is the ideal dimension of a joint?
Joint sealants can only reach their full potential if they comply with a minimum and maximum width. We recommend never applying an elastic joint narrower than 3 mm or wider than 20 mm for acrylates, 30 mm for silicones and 50 mm for Parabond Construction...
How can discolouration be prevented in sealants?
carefully cleaning substrates before application
avoiding direct contact with risk materials
using compatible tools and products
paying attention to the environment during curing
Is every smoothing product suitable as a tooling agent for sealants?
Not every smoothing product is suitable. We recommend always using a compatible, professional tooling agent.
Can other sealants affect the colour of the sealant?
Yes, reactions between acetic acid-containing and neutral silicones can cause yellowing.
Can masking tape affect the colour of the sealant?
Yes. When masking tape is used on or along the joint, adhesive residues may remain.
What role does protective film on panels play in the discolouration of sealant?
When the sealant comes into contact with remaining adhesive residues, this can lead to discolouration.
Which materials can cause discolouration of a sealant?
Rubber and rubber-like materials such as EPDM or neoprene. Bituminous products. Coatings, paints or varnishes containing wax components. Adhesives or adhesive residues.
Is yellowing of the sealant a product defect?
In almost all cases, it is not.
Why can a sealant change colour over time?
In practice, discolouration is in most cases the result of external influences and not due to the quality of the sealant itself.
How are joint sealants renovated?
Before renovation takes place, it is important to find out why the joint sealant was not sufficient.
Adhesives
What requirements must the substrate meet to be able to install parquet?
The substrate must be dry, level and sufficiently flat and strong with good surface cohesion.
What is meant by an initial tack?
Initial tack is an adhesive sealant that provides sufficient adhesive strength when heavy materials attached to walls or ceilings cannot always be supported until the adhesive has cured.
What is the importance of choosing the right adhesive for parquet?
The choice of a parquet adhesive depends on the nature and flatness of the substrate, the properties and dimensions of the floor elements, ...
Which glue is best for bonding baseboards?
A popular choice for gluing wooden baseboards to plaster is Parabond 600.
How to correctly bond façade panels?
Correct bonding of façade panels is essential for a durable, aesthetic and KOMO-certified result. With the Parabond Panel System from DL Chemicals, the installation process is clear and straightforward:
PU foams
Is cured PU foam resistant to water or UV?
PU foam is not resistant to UV rays and should therefore always be repainted or plastered if there is direct sunlight.
Can I store an opened can of PU foam for a long time?
After using a pipette foam canister, you can simply fold the pipette over and push it down onto the closure piece developed for this purpose. This way, the remaining foam does not come in contact with the air. This method gives you the opportunity to...
How to correctly apply PU foam?
A PU foam will create better padding and adhere better in a humid environment.
How do I apply adhesive foam to insulation panels?
Apply in grooves, with maximum unevenness between insulation and substrate of 1 cm...
Extranet
I created an account but can't log in right away yet?
When you create an account on our extranet it must be manually approved by one of our employees. That way we can also link your account to the correct customer number in our system so you can consult all price and order information. We will try to activate...
How can I collect my order correctly and smoothly?
Place your order at least 4 hours in advance, and during working hours.
How can I place an order?
Via our extranet or by e-mail at info@dl-chem.com
Roof & Waterproofing
How can I protect my building from groundwater?
Depending on the conditions of the water load, various solutions are possible
How can I treat rising damp?
To combat rising damp, the injection of a moisture-resistant agent is an excellent and effective solution.
How do I install insulation on my flat roof?
A warm flat roof is the most recommended and commonly used insulation method, where the insulation is placed on the outside of the roof structure.
How to protect against rainwater infiltration?
Walls and porous roofs can be easily protected by the application of a hydrophobic agent.
Window and door sealing
Why is proper sealing of windows and doors essential?
Proper sealing limits energy loss, prevents draughts and moisture problems, improves sound insulation and extends the lifespan of the joinery.
Why is a layered sealing system (3-level system) important?
A layered sealing system in three levels ensures a weather-resistant exterior, an insulating middle zone and an airtight interior finish. This keeps performance and comfort optimal.
Which PU foam is suitable for low-energy or passive construction?
Parafoam Flexible NBS, Parafoam Low MDI NBS