70g Butter Paper General Purpose For Engineering Drawing And CAD Output
70 g/m² Butter Paper is the most widely used grade for manual engineering drawing, CAD inkjet/laser plotting, and architectural sketches. With transparency around 67% and improved tearing resistance (≥200 mN), it withstands erasing and revision without damage. The neutral pH (6.0‑8.5) ensures long‑term archiving without yellowing.
Technical Specifications (Interpolated from 75g data)| Parameter | Unit | Value |
|---|---|---|
| Basis Weight | g/m² | 70 (±5%) |
| Transparency | % | ≥67 |
| Tearing Resistance | mN | ≥200 |
| Smoothness (Bekk) | s | ≥22 |
| Machine Direction Stretch | % | 3.5 |
| Cross Direction Stretch | % | 12.0 |
| Sizing Degree | mm | ≥1.5 |
| Moisture Content | % | 7.0±1.0 |
Modern acid‑free process with higher basis weight requires increased fiber bonding. Beating degree maintained at ≥90°SR to preserve transparency. Extended low‑temperature drying ensures uniform shrinkage. Semi‑dry calendering at 12‑15% moisture followed by surface sizing with stearic acid starch/PVA for oil and water resistance. Final calendering achieves smoothness ≥300s and excellent dimensional stability.
Applications & Advantages by Category-
Engineering Drawing – Manual drafting for mechanical, architectural, and civil engineering; accepts pencil, ink, and technical pens.
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CAD Output – Compatible with dye/pigment inkjet plotters and laser printers; clear lines, no smudging.
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Blueprint Making – Base sheet for diazo (ammonia) process; anti‑aging and light‑resistant.
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Overlay Tracing – Lay over maps or circuit diagrams for revision; stable under humidity changes.
70g is the all‑round workhorse for engineers and architects, trusted for daily drafting and printing tasks.
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