Wood Pellets DIN Plus Certification

Property class

Unit

Requirements

Diameter

mm

6 ± 1.0

Length¹⁾

mm

3.15 < L < 40

Water content

w – %

< 10.0 %

Ash content (550 °C)

w – %

< 0.7 %

Mechanical durability as received

w – %

> 97.5 %

Fines at the end of produc-tion line²⁾

(“at the factory gate”, last loading before delivering to end-user)

w – %

Small bags (up to 20 kg): < 0.5 %

Large sacks and bulk ware: < 1.0 %

Net calorific value as received

MJ/kg

kWh/kg

16.5 MJ/kg to 19 MJ/kg

4.6 kWh/kg to 5.3 kWh/kg

Bulk density as received

kg/m³

> 600 kg/m³

Additives³⁾

w - %

< 2%

Nitrogen content

w - % dry

< 0.3 %

Sulphur content

w - % dry

< 0.03 %

Chlorine content

w - % dry

< 0.02 %

Arsenic

mg/kg dry

< 1

Cadmium

mg/kg dry

< 0.5

Chromium

mg/kg dry

< 10

Copper

mg/kg dry

< 10

Lead

mg/kg dry

< 10

Mercury

mg/kg dry

< 0.1

Nickel

mg/kg dry

< 10

Zinc

mg/kg dry

< 100

Ash melting temperature

°C

> 1200°C (if possible)

¹⁾ Amount of pellets longer than 45 mm can be 1 w - %.

²⁾ Parts of size less than 3.15 mm

³⁾ Type of additives to be defined. Chemically unmodified products from primary agricultural and forestry bio-mass (for example wholemeal corn, cornstarch and rye flour) may be mixed with the raw materials for the production of wood pellets to ease the pressing procedure and also, as a result, an improvement of the en-ergy balance and to increase the abrasion resistance.