Permanent Markers

Soni OfficeMate Permanent Markers | Bullet Tip Quick-Drying Markers | Refillable & Eco-Friendly | Vibrant Colours | Pack of 4 & 8 | Non-Toxic, Long-Lasting, Multi-Surface Markers

Technical Specification:

  • Soni OfficeMate Permanent Markers are engineered for high-performance, long-lasting marking on porous and non-porous surfaces including metal, glass, plastic, ceramic, and wood.
  • Constructed with a high-density polypropylene (PP) barrel measuring 140 mm ± 2 mm for structural rigidity, chemical resistance, and ergonomic handling.
  • Equipped with a precision bullet tip (4.43 mm ± 0.2 mm) ensuring controlled ink output, consistent line thickness, and smooth flow under variable writing pressures.
  • Formulated with alcohol-based permanent ink offering superior adhesion, color density, and resistance to water, UV exposure, and surface abrasion.
  • Features rapid drying (<5 seconds on non-porous substrates) and non-bleeding characteristics, delivering clean, smear-free results.
  • Standard colors (Black, Blue, Red, Green) are refill-compatible, extending product life and reducing polymer waste generation.
  • Ink formulation is low-odor, non-toxic, and compliant with ASTM D-4236 standards, ensuring safe use in industrial, educational, and office environments.

Key Features:

  • Bold, Fade-Resistant Ink: Formulated with high-quality pigments to deliver intense, long-lasting colour that resists fading over time.
  • Universal Surface Compatibility: Ensures excellent adhesion and performance on a wide range of substrates including metal, glass, plastic, ceramic, and wood.
  • Alcohol-Based, Quick-Drying Formula: Fast-evaporating solvent system enables clean, smear-free writing with minimal drying time.
  • Low-Odour & Non-Toxic Composition: Xylene-free, alcohol-based ink designed for user safety and reduced environmental impact.
  • Extended Cap-Off Time (Up to 24 Hours): Specially engineered ink formulation prevents premature drying, maintaining smooth ink flow even after prolonged exposure.
  • Advanced Tip Technology: Durable, wear-resistant tip delivers consistent line quality and superior writing control over extended use. 
  • No Bleeding or Feathering: Optimized ink viscosity ensures precise, crisp lines on porous and non-porous surfaces alike.
  • Bright and Vivid Colours: High chroma pigments provide excellent colour density and visual impact.
  • Smooth Writing Performance: Balanced ink flow system allows effortless marking with uniform coverage.

Physical Properties – Basic Colours (Black, Blue, Red, Green) :
1. The ink demonstrates a Brookfield viscosity in the range of 10.60 to 11.10 cps at 25°C, measured using a 61 LV spindle at 60 rpm, ensuring optimal rheological properties for smooth, controlled ink flow during application.

2. All basic colours maintain a uniform surface tension of 25.00 d/cm, which contributes to consistent spreading behaviour and
 superior line definition on both porous and non-porous substrates.

3. The specific gravity of the inks varies slightly across shades—0.900 for Black, 0.890 for Blue, 0.875 for Red, and 0.900 for Green—indicating precise pigment dispersion and balanced solvent composition for stable density and weight distribution.

4. The inks exhibit rapid drying characteristics, achieving a drying time of less than 10 seconds on plastic and glass surfaces, which minimizes smudging and enhances efficiency in continuous marking operations.

5. All formulations show good light fastness, maintaining colour integrity and contrast when exposed to light over extended periods, thus ensuring long-lasting visibility of markings.

6. The inks possess excellent water resistance, providing strong adhesion and durability even under humid or wet conditions, making them ideal for both indoor and outdoor applications.

7. Under a 24-hour cap-off test at 25°C, the inks retained good flow and reusability, confirming effective solvent balance and minimal tip dry-out, a critical property for professional and industrial usage.

8. In an accelerated oven stability test conducted at 50°C for 15 days, all colours exhibited stable ink flow (Flow OK), demonstrating superior thermal resistance and long-term formulation stability.

9. These findings confirm that the ink formulations are chemically stable and physically resilient, maintaining viscosity, colour strength, and adhesion under diverse environmental and operational conditions.

10. Overall, the basic colour series delivers high-performance writing properties, including controlled ink flow, quick drying, water resistance, and thermal stability—ensuring consistent, reliable results across multiple surface types and usage
 environments.

Component & Materials :
 Nibs : Polyester (PE) / Acrylic
 Filters : Polyester with polypropylene wrapping 
 Barrels : Polypropylene (PP) 
 Caps : Polypropylene co-polymer (PPCO) 
 Nozzle & Plugs : Polypropylene

Permanent Ink Compatibility :

  • Suitable for refillable permanent markers
  • Compatible with felt-tip and fiber-tip marker systems 
  • Ideal for office, industrial, artistic and DIY use
  •  Ensure smooth ink flow and long-lasting marks
  •  Works well on a variety of surface: paper, cardboard,
     plastic, metal, glass, ceramics, wood, rubber etc.

Shelf Life and Storage Instructions :
 Shelf Life :
 2 years from the date of manufacture (when unopened and stored properly) 
Storage Instructions :
 Store in a cool, dry and well-ventilated area.
 Keep ink containers tightly sealed when not in use to prevent evaporation.
 Avoid direct sunlight, open flames and sources of heat Do not freeze. If freezed, for
 best result allow ink to come on room temp before use.
 Keep away from children and unauthorized users.
 Shake well before use.
 Store at room temperature (ideally 15-30°C) for best results.

FAQs:
Q 1 : Are these markers refillable?
A: Yes, Black, Blue, Red, and Green markers are refillable.
Q 2: Are the markers safe for children?
A: Yes, they are non-toxic and child-safe.
Q 3: Can the ink be erased easily?
A: Yes, it wipes off clean with a dry cloth or eraser.
Q 4: What tip size do these markers have?
A: They have a 4.43 mm bullet tip for fine and bold lines.
Q 5: Which pack sizes are available?
A: 4 pcs blister pack and 8 pcs set in vibrant colours.