Speform Metall-Chemie GmbH

Characteristics: SPEFUR furan resins are acid-curable synthetic resin products for binding core and moulding sand at room temperature. The base material for all SPEFUR furan resins is pure furfuryl alcohol. The SPEFUR furan resin product range includes numerous qualities, which cover all types of casting and applications.

Properties: The cores and moulds made with SPEFUR furan resins are particularly characterised by their extremely good dimensional stability and very high strength. The special composition of these resins (high furfuryl alcohol content while at the same time having minimum free formaldehyde, nitrogen and water content) results in environmentally friendly use. All types in the SPECATIL hardener product range are particularly suitable as hardeners.

Application: The products are usually used in continuous mixers. If used in batch mixers, place sand in first, add SPECATIL hardener and mix for 2 minutes. Then add SPEFUR resin and mix for a further 2 minutes.

Shelf-life: At least 6 months, if stored appropriately in closed containers.

Characteristics: Ready-to-used moulding sand - very fine-grained - for making sharp contoured and very smooth surfaces in almost all metals. Immediate casting after moulding without drying and without coating. Also very suitable for making synthetic resin and gypsum samples (request our technical leaflet).

Use: Standard sand: SPEFOL can be cast in several times until its compressive strength has fallen below an appropriate level. Only then is SPEFOL regenerated.

Facing sand: SPEFOL is strengthened by normal filler sand. The moisture of the filler sand has no harmful effect.

Regeneration: After casting it is sufficient to simply loosen the sand to make it ready for moulding again. In case of lost plasticity, simply add 1/10 % of the special binder oil (100 g oil to 100 kg SPEFOL).

In case of insufficient compressive strength, in general it is sufficient to add 1/10 % of the special paste (100 g paste to 100 kg SPEFOL). The regeneration should take place in the pan mill mixer or in the core sand mixer. Spinning the sand is advantageous.

Application: Stamp the sand very hard (~mould hardness 85 according to +GF+). Always use parting powder on joint faces. Pour the metal into the mould slowly. Vent. Leave the casting in the mould for as long as possible. The surface will be smoother and the sand will stay usable for longer.

Characteristics: SPECOSIL sodium silicate binders have been developed for all kinds of different standards and requirements within the foundry industry.

Depending on the SPECOSIL type, curing takes place with CO2 or special esters. At the same time, good breakdown properties are achieved. If necessary, an additional breakdown promoter is used to improve core breakdown still further.

SPECOSIL grades and hardeners are also available, which achieved good results when used with continuous mixers.

The casting surface is improved by using SPECOTIN alcohol-based coatings.

SPECOSIL can be stored for 6 months in cool conditions.