--- title: Leneta Sealed Charts | Novamart AG url: https://novamart.ch/en/brands/leneta/leneta-sealed-charts/ language: en-GB --- # Leneta Sealed Charts | Novamart AG > Leneta sealed charts and cards for opacity, hiding power, penetration and colour testing. At Novamart AG. Partner ## Sealed charts and cards for coating tests # Sealed charts and cards for coating tests - **Leneta's sealed charts** are made from high-quality, **0.35 mm (14 mil) thick, double-sided coated cardboard** produced - **Leneta's sealed cards** consist of **0.5 mm (20 mil) thick, **one-sided** coated cardboard with greater rigidity** for more convenient handling. Both products are equipped with a **100%igen UV topcoat sealed** which prevents applied varnish from penetrating the paper. The paper contains **No optical brighteners** which can affect instrumental colour measurements. ### Opacity charts **Opacity charts** also known as 'hiding power charts' or 'contrast ratio charts', have simple combinations of **black and white surfaces** which **are large enough for reflection measurements** with wide aperture, and for **Visual opacity and colour observations** . The black and white test areas are marked with a **clear, impermeable top layer sealed** which prevents the penetration of applied coatings into the paper. ### Penopac charts These **Penopac charts** ( **Pen** etration & **Opac** ity) combine the test areas and functions of a **Penetration map and an opacity map** . They can be regarded as universal test cards for research and development as well as for quality control. Penopac cards contain **both sealed and unsealed areas** . The **sealed** Areas are marked with a **clear, impermeable top layer** which prevents penetration, while the **not sealed** Areas with a **semi-porous clay coating** are provided. ### Penetration charts An important feature of architectural coatings is their ability to create a **Uniform appearance on surfaces with varying porosity** to preserve the colour. This ability, in which gloss and colour uniformity are specific aspects, is known as **Penetration resistance** labelled. The **adjacent sealed/unsealed areas** points for testing the penetration resistance **clear conditions with varying porosity** represent. In addition to the qualitative visual observations, photometric measurements on the two areas provide objective numerical values. ### Display charts / Spreading rate charts These **Display Charts** use the **proven diagonally striped pattern** which have a strong visual impact and emphasise the differences in the opacity of the film. They are therefore often **for displaying the opacity through drawdowns or brushouts** used. Grey stripes in the form 8H-GW ensure a lower substrate contrast when using coatings with low opacity. The **Spreading Rate Charts** (Form 8H and 8H-GW) have a **Area of exactly 0.1 square metre** n and become **for Brushout opacity tests with certain coating speeds** as described in ASTM method D 344. ### Opacity - Display charts / Spreading rate charts Charts of this type **combine the large, uninterrupted surfaces** which are characteristic of opacity cards, **with the stripe design** a display chart. The larger areas allow **Photometric measurements with wide aperture** and **Visual colour comparisons** while the striped area for the **Comparison and display of opacity** is uniquely effective. **Spreading rate charts** (Forms 12H and 13H-H) have an area of exactly 0.1 square metres and are to be used for the **Spreading at certain application rates** intended. ### Checkerboard charts / Spreading rate charts One of the earliest surfaces for testing opacity was linoleum with a **black and white chequered pattern** . This was soon replaced by **Sealed cardboard panels** of which the form 10H and 10H-BG Spreading Rate Charts are typical examples. They were developed for the **Brushout at certain application rates** developed, such as the ASTM method D 344 and the Canadian 1-GP-71, but are also used for **Draw down applications** like their smaller counterparts, the Form 10A and 10B. The black and grey squares in Form 10H-BG offer reduced contrast for testing coatings with lower opacity. ### Brushout cards The for **informal brushout applications** developed paper is thicker than normal card paper - **0.5 mm** (20 mils) compared to 0.35 mm (14 mils) to achieve a **greater rigidity and more comfortable handling** to ensure a high level of safety. They are also frequently used for **Drawdowns and colourimetric measurements** used. ### Duplex applicator charts They were originally developed for the Duplex applicator, a device used for the rapid production of **adjacent drawdowns** is designed. Today they mainly serve as **General colour test cards** . ### Single-coloured white charts & maps/black charts/grey charts These Leneta charts and cards are sealed on one side with a clear, impermeable top layer so that the applied coatings cannot penetrate the paper. --- Novamart AG, Rosenbergsaustrasse 7, 9434 Au SG, Schweiz. Telefon +41 71 228 88 33, info@novamart.ch. Übersicht für Agenten: https://novamart.ch/llms.txt