Whiteboard Markers (4pcs & 8pcs)

Soni OfficeMate Whiteboard Markers | Bullet Tip Dry-Erase Markers | Refillable & Eco-Friendly | Vibrant Colours | Pack of 4 & 8 | Non-Toxic, Long-Lasting, Smooth Writing for Office, Classroom & Home

Technical Specification:

  • Ink Type: High-opacity, low-odor, non-toxic ink for bright and durable writing.
  • Available Packs:
  • 4-Pc Set: Black, Blue, Red, Green
  • 8-Pc Set: Black, Blue, Red, Green, Pink, Orange, Brown, Violet
  • Refillable Colors: Black, Blue, Red, Green – eco-friendly and cost-effective.
  • Tip Size: 4.43 mm bullet tip for fine and bold strokes.
  • Marker Length: 14 cm for a comfortable grip and smooth writing.
  • Erase Performance: Quick dry-wipe removal with no residue.
  • Durability: Long-lasting ink—up to 3x longer life; safe and xylene-free.
  • Applications: Ideal for classrooms, offices, and training environments.

 

 

Key Features:

1. Extended Cap-Off Time

Remains usable for up to 24 hours without drying, ensuring uninterrupted writing performance.

2. High-Performance Pigment Ink

Provides brilliant, fade-resistant colours with excellent lightfastness and visibility.

3. Low-Odour & Non-Toxic Formulation

Crafted with safe, alcohol-based solvents, free from harmful chemicals like xylene and toluene.

4. Fast-Drying & Smear-Resistant

Instant-dry ink technology prevents smudging for clear, sharp writing every time.

5. Effortless Erasing

Wipes clean up to 21 days after application without leaving stains or ghost marks.

6. Refillable & Eco-Friendly Design

Sustainable refill system reduces plastic waste and extends marker lifespan.

7. Precision Bullet Tip (4.43 mm)

Engineered for smooth ink flow, ideal for both fine detailing and bold strokes.

8. Ergonomic & Compact Body

Comfortable 14 cm design offers superior grip and balance for long writing sessions.

9. Durable & Long-Lasting

High ink capacity and sturdy tip deliver up to 3x longer performance than standard markers.

10. Safe & Versatile Application

Complies with international safety standards, suitable for classrooms, offices, and home use.

 

Physical Properties – Basic Colours (Black, Blue, Red, Green) :

  • Brookfield Viscosity (at 25°C, 60 rpm by 61 LV Spindle):
  1. Black: 12.30 cps | Blue: 13.45 cps | Red: 15.35 cps | Green: 15.20 cps 
  2. Ensures smooth ink flow and consistent writing performance.
  • Particle Size (µ) :

Uniform range of 0.4 – 1.0 µm across all colours for stable dispersion and clear marking.

  • Surface Tension (d/cm) :
  1. Black: 24.00 | Blue: 24.00 | Red: 23.00 | Green: 25.00
  2. Optimized for controlled ink spread and adhesion on non-porous whiteboard surfaces.
  • Specific Gravity (g/cm³ \) :
  1. Consistent value of 0.820 g/cm³ for all shades, providing balanced ink density and refill compatibility.
  2. Drying Time on Whiteboard :
  3. Less than 5 seconds for all colours, preventing smudging during rapid writing.
  • Erasability (after 21 days) :

Excellent – ink wipes cleanly without ghosting or residue even after extended exposure.

  • Cap-Off Performance (24 hrs at 25°C) :

Good – marker remains functional after 24 hours without cap, confirming superior open-time stability.

  • Oven Test (50°C for 15 days) :

Flow OK for all colours, validating heat resistance and ink durability.

  • olour Range Stability :

Consistent optical density and brightness maintained across all four base colours.

  • Performance Summary :

Fast-drying, low-odour, and thermally stable formulation ideal for professional, educational, and industrial applications.

 

Component & Materials :

Nibs : Polyester (PE) / Acrylic

Filters : Polyester with polypropylene wrapping

Barrels : Polypropylene (PP)

Caps : Polypropylene co-polymer (PPCO)

Nozzle & Plugs : Polypropylene

 

Special Colours Available :

Whiteboard Ink Compatibility :

  • Dry-erase ink (non-permanent)
  • Can be easily erased with a duster or cloth
  • Doesn’t leave ghosting (faint stains or marks)
  • Safe for common whiteboard surface (like melamine, porcelain, glass etc.

Shelf Life and Storage Instructions :

Shelf Life :

2 years from the date of manufacture (when unopened and stored properly)

Storage Instructions :

  • Keep tightly sealed when not in use to prevent ink from drying out.
  • Store in a cool, dry place (ideal temperature: 10°C-30°C).
  • Avoid direct sunlight and heat exposure.
  • Keep away from open flames and sources of ignition (ink may be flammable).
  • Store ink bottle/container upright to prevent leakage. Keep out of reach of children.

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.