Hebopress F 25kg

A calcium sulphate derivative indicated for the manufacture of press moulds.

begin by trying a plaster water ratio of 2.9:1. The greater the proportion of plaster, the greater the strength but the lesser the absorption.

The plaster is poured into the water (never the other way around), is allowed to moisten and is mixed for approximately one minute, stirring it gently and evenly to prevent the formation of air bubbles. The recipients must be clean.

STORAGE
In dry areas on wooden slats, with spaces between rows and with the wall to ensure free air circulation. The plaster can be stored in these conditions for months without losing its properties.

ANALYSIS

PHYSICAL SPECIFICATIONS

Colour White
Ph Approx 7
Mixing Rate 280gr powder for each 100gr water
Start setting time 14 – 1 5 minutes
Finish Setting Time 28 – 30 minutes
Setting Expansion 1.1 mm / m
Brinell Hardness 2.000 kg / cm²

PRODUCTION OF A PRESS MOULD
Water temperature must be between 15 and 20°C
Add the plaster to the water
Stir slowly to remove the lumps
Machine mix for 6-10 minutes according to the machine speed, without emptying
Continue to hand stir until the mixture begins to thicken
Pour into the mould
Once the mixture is at the right strength, at approximately 8 – 10° C above the starting temperature, start to introduce the air, at a speed of approximately ½ an atmosphere/ minute until reaching 5 atmospheres.
The mould can be lifted when pressure reached 3 atmospheres.