LDPE – Plastic
History
When was polyethylene invented?
The polymer was first produced in 1898 by accident by the German chemist Hans von Pechmann when he heated diazomethane. An industrially viable process for its preparation was accidentally discovered in 1933 by British chemists Eric Fawcett and Reginald Gibson at Imperial Chemical Industries (ICI) in Northwich, England.
Vad är LDPE?
LDPE plastic stands for low-density polyethylene. Low-density polyethylene consists of a soft thermoplastic with tight cells, which therefore does not let air or water through.
The LDPE plastic is therefore not resilient in the same way as, for example, polyurethane foam, which contains open cells (air-filled cavities).
Thanks to the higher mechanical resistance of LDPE plastic, it is very well suited for packaging or insulating purposes, and has very good shock absorption. The LDPE plastic is resistant to both heat and chemicals, is easy to seal, color, and is relatively lightweight.
The opposite of LDPE plastic is HDPE plastic, which stands for high-density polyethylene. HDPE plastic consists of tighter molecules than LDPE plastic, which makes HDPE plastic much harder and denser and with higher tensile strength than LDPE. HDPE plastic is therefore often used in the manufacture of more shape-retaining robust containers, such as plastic dustbins, water pipes or children’s toys
Facts about the LDPE plastic we sell
| Materialtyp | Låg Densitets Poly Eten (LDPE) |
|---|---|
| Råvara | återvunnen LDPE-plast |
| Materialform | skivor |
| Standardyta | slät eller med durkplåtsmönster |
| Färgmöjligheter | alla |
| Standardfärger | ljusgrå, neutral mörkgrå, svart, vit |
| Bearbetningsmöjligheter | |
|---|---|
| Sågning | Ja |
| Borrning | Ja |
| Fräsning | Ja |
| Värmeformning | Ja |
| Mekaniska egenskaper | DIN EN ISO | Enhet | |
|---|---|---|---|
| Densitet | 53479 | g/cm³ | 0.92 |
| Kulhårdhet | 53456 | (N/mm2) | > 18 |
| E-modul böjning | 53457 | (N/mm2) | > 140 |
| Brottöjning | 53455 | % | < 4 |
| Brottstyrka | 527 | MPa | > 40 |
| Punkttryck (rekommenderad maxbelastning) | N/A | ton | 50 (styrs av underlaget) |
| Termiska egenskaper | DIN EN ISO | Enhet | |
|---|---|---|---|
| Min./max. användnings-temperatur | °C | -40 till 70 | |
| Linjär termisk utvidgning | 11359 | mm / m / 10 °C | 1,8 |
| Smältpunkt | DIN 53765 | °C | 104 |
| Värmeledningsförmåga (Lamdavärde) | W/(m*k) | 0,34 |
| Kemiska och fysiska egenskaper | DIN EN ISO | ||
|---|---|---|---|
| UV beständighet | 10640 | N/A | OK |
| Vatten absorption | 62 | % | < 0.01 |
All values are indicative values and may vary depending on preparation methods, additives, influence from the use environment, etc. The values cannot therefore be guaranteed.
Characterization of chemical content in LDPE samples submitted to RISE (Research Institutes of Sweden AB) 2020-02-27
Results:
No organic compounds, heavy metals, halogens or other substances
which are listed as SVHC (Substances of Very High Concern) are detected in concentrations above 0.1% by weight
(1000 mg/kg). The analysis results show no compounds that conflict with REACH,
the candidate list or which are listed in BASTA’s* property criteria.
*BASTA
BASTA is an independent environmental assessment system for building and construction products aimed at contractors, clients/builders, property owners, architects, consultants, wholesalers and material suppliers.
Our LDPE boards are rated “Recommended” by Byggvarubedomningen, which is the best rating on their three-level scale.
Byggvarobedningen is a non-profit economic association that assesses and provides information on sustainability-assessed goods.
Their vision is to promote development towards a non-toxic and good built environment that takes responsibility for both this and future generations.
Their members today consist of architectural companies, municipalities, county councils, real estate companies, government authorities, contractors, players in the construction industry, etc.
For more information about the Byggvarubedomningen, click HERE
