Product Description
Hot sales friction pen, stick function erasable gel pen with cap and eraser, school and office use, ergonomic soft grip shape design, writing smooth, 0.6/0.7mm tip,
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Greenwill quality standard:
1. ink shelf life:
>18 months
Normal quality ink shelf life: 12 months or less
2. ink safety testing standard:
EN71-3/9, SVHC, PAHS
Normal quality ink: EN71-3 or no testing
3. Ink temperature limit
Greenwill ink:
High Temperature limit: 63ºC
Low Temperature limit: -18ºC
Normal quality ink:
High Temperature limit: 50ºC
(the ink color is quite risky to fade in hot weather)
Low Temperature limit: 0ºC
(the erased color is quite risky to appear again in cold weather)
4. Ink grain size:
A: Smaller size reduce the risk to block the pen tip after writing for some time
Tinlong ink: 0.3-0.8μm, 0.6μm in average
Normal quality ink: 1-5μm
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