Lambdapor® 750 STD

Pre-expansion

With discontinuously operating, state-of-the-art preexpanders lambdapor® 750 STD premium can be pre-expanded down to densities of approx. 16.5 kg/m³. To achieve lower densities, lambdapor® 750 STD premium should be preexpanded in two stages.

Approach for 2 stage expansion

• 1st pre-expansion: We recommend an initial pre-expansion of lambdapor® 750 STD premium to about 1.5 times the final required density after the second expansion stage. With batch pre-expanders it is possible that the light sensors do not recognize the material in the preexpansion chamber because of its color. This may lead to a failure of the automatic steam switch-off. To prevent this occurring the steaming time should be fixed or the sensor setting modified. The intermediate storage time before the second preexpansion should be between 2 and 6 hours
• 2nd pre-expansion: The second pre-expansion is usually carried out with continuously operating pre-expanders. The minimum bulk density that can be achieved is approx. 11 kg/m³.

Intermediate aging

Intermediate storage period should be between 6 and 24 hours.

Molding

lambdapor® 750 STD premium can be processed on commercially available block molding machines. Steaming should be reduced compared to other EPS types as the usual steaming would result in extended cycle times. lambdapor® 750 STD premium yields very well fused insulating boards, even with reduced steaming.

During the processing of lambdapor® 750 STD premium small amounts of dust can be created by abrasion of the beads. As the dust is mainly originating from the pre-expansion process appropriate measures have to be taken to extract the dust in the molders plant.

Flammable pentane-air mixtures may be generated during storage and processing of lambdapor® 750 STD premium. For this reason, adequate ventilation must be ensured (LEL pentane 1.3 % by volume). The blowing agent pentane escapes relatively slowly from EPS foam blocks. Thus, when cutting recently molded blocks, the formation of a flammable pentane-air mixture has to be anticipated.

In addition, all conceivable sources of ignition must be kept away, and the build-up of electric charges has to be prevented.

lambdapor® 750 STD premium is shipped in octabins (height max. 192 cm) on wooden pallets (114 x 114 cm) containing 1,150 kg net of material.

We recommend that lambdapor® 750 STD premium molded parts are packed in opaque plastic film, as their exposure to direct sunlight can result in fading and distortion.

The octabins are not weather- or waterproof and must therefore not be exposed to outdoor conditions. It is not recommended to stack octabins more than one layer high. In case of double-stacking octabins under controlled conditions, the recommendations laid out in the document „Instructions for stacking sunpor octabins“ must be followed. In order to obtain the desired properties of lambdapor® 750 STD premium, the raw material should be stored below 20 °C and be processed within one month.