One of the most frequent mistakes packaging procurement managers make when placing bulk paper orders is focusing solely on the price per ton without specifying the exact Grammage (GSM) and Burst Factor (BF) balance.
1. Understanding Grammage (GSM) vs Burst Factor (BF)
GSM stands for Grams per Square Metre and defines the weight of a 1x1 metre sheet of paper. However, two 120 GSM Kraft paper reels can have dramatically different structural strengths based on their Burst Factor (BF).
Bursting strength is measured using a Mullen tester in kg/cm². The Burst Factor is calculated using the formula:
Burst Factor (BF) = (Bursting Strength in kg/cm² × 1000) / GSM
2. Recommended GSM Guidelines by Industry Application
| Packaging Type | Recommended Paper Grade | Ideal GSM Range | Target Burst Factor (BF) |
|---|---|---|---|
| Outer Shipping Cartons (5-Ply) | Virgin Kraft Reel | 140 – 180 GSM | 22 – 32 BF |
| Inner Fluting Medium | Corrugation Fluting Paper | 100 – 120 GSM | 18 – 20 BF |
| Garment & FMCG Boxes | Duplex Board (Grey Back) | 250 – 350 GSM | Smooth Gloss Print |
| Food Wrapping & Liner | Greaseproof Butter Paper | 30 – 40 GSM | FSSAI Certified |
3. How Deckle Slitting Impacts Cost Efficiency
When ordering industrial paper reels from Rajshree Infinity, supplying your corrugator machine deckle width allows our mill team to slit reels with zero trim loss. This saves up to 8% on raw material wastage per container dispatch.
