Printcolor 700 HDa

Hardener – Printcolor 700 HDa

Printcolor 700 HDa is a reactive hardener system developed for long term outdoor and demanding applications, to be use with pad and screen printing inks on plastics and metals.

The official technical stuff from Printcolor
Printcolor 700 HDa hardener is based on aliphatic components that combine the characteristics of high chemical resistance and extremely good abrasion resistance.  It is based on a highly reactive bonding compound that produces an extremely durable cured ink layer with high chemical and mechanical resistance.

Printcolor 700 HDa is engineered for UV stability and to be yellowing-free even after prolonged outdoor exposure.  HDa produces a glossy cured link layer that is highly flexible, allowing it to bend with flexible substrates without becoming brittle.  Printcolor 700 HDa can be used with most pad printing and many screen printing inks.  However, to take full advantage of the UV stability and flexibility possible with HDa the best ink partners  are the pad printing Series 752, Series 784, Series 792 and Series 711.  Refer to the Technical Information and 700-HDa MSDS documents for more details.

What we say about Printcolor 700 HDa
The unique chemical crosslinking that gives HDa it’s flexibility and outdoor stability takes more time or temperature to reach full cured hardness compared with 700 HDi hardener.  This may present handling issues for high throughput applications such as industrial processing lines.  For commercial printers longer curing may simply mean postponing product repacking until the following afternoon rather than on the morning after printing – especially during cooler months.

An advantage of the slightly longer curing times is increased pot life.  Ink mixed with HDa has an average pot life of 6-8 hours (and often longer) depending on your ink type and ambient conditions.  Printcolor 700 HDa requires temperatures above 15 degrees C for chemical crosslinking to take place,  ideal curing conditions are at room temperature – 20 degrees or higher.  You can increase print durability and reduce curing time by oven baking the printed product.  Mixing ratios of ink to HDa will vary with the on ink series your using and your end application, these are listed in the technical leaflets and on ink can labels.

The good oil from our trade print room

  • We always use 700 HDa when printing with Series 784 (it just runs better for longer than with HDi) and Series 792 (it’s a flexible ink and requires a flexible hardener).
  • HDa is specifically formulated for two characteristics; UV stability for long term outdoor use, and an elastic cured ink layer useful on flexible substrates like leather, stress balls or hinged PP for example.
  • When using 700 HDa we generally print and ship the next day in summer (approx. 24 hours in 25 degree + temperatures) but would leave for 36 to 48 hours when curing at room temperature over winter months (less than 22 degrees).  Curing time can be reduced by increasing temperature either by baking in an oven or moving product to a heated room.
  • Hardener going ‘off’ in the can is a complaint we hear made of all brands.  We guarantee if you routinely clean the spout and replace the cap properly after each pour, you will get full use of your can of HDa right down to the very last drop – we do.
  • DON’T use more hardener than the recommended amount.  If you overdose ink with hardener you’ll lengthen curing time and risk reducing print adhesion and durability.
  • You cannot use HDa with metallic gold in some ink Series.  The cooper in gold metallics reacts with HDa and acts as a catalyst for the hardener, giving you about 20 minutes of pot life.  If you need to use HDa for a gold print, we have mixing recipes based on metallic silver that will produce a stunning gold ink fully compatible with HDa hardener.
  • We use HDa a lot in summer to extend ink pot life in hot and humid working conditions.

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