This document provides instructions for sampling slurry at the outlet of a mixer in order to analyze the particle size distribution. It describes taking 3 samples of slurry using a spatula and placing them in plastic containers with ethanol to stop hydration. The samples should be taken just after the boots in the middle of the width and should have 0.5-1 cm of paste on the spatula. The plant, date and time should be recorded on the containers.

1. Process document
Version 1
Direction Industrielle
Direction Assistance des
Procédés
SLURRY SAMPLING Page : 1 / 4
Date : March 3, 2006
© Copyright 2006, Lafarge Plâtres
All rights reserved. No part of this document may be reproduced, stored in a retrieval system, translated, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, without prior written permission of Lafarge Plâtres. CONFIDENTIAL The information contained herein is confidential and proprietary to Lafarge Plâtres. It may not be disclosed or
transferred, directly or indirectly, to any third party without the explicit written permission of Lafarge Plâtres
1. PURPOSE
Analysis of the Particle Size Distribution of the slurry at the outlet of the mixer.
2. FIELD OF APPLICATION
All LAFARGE Gypsum Division sites producing Plasterboard.
3. PRINCIPLE
Sampling of the slurry at the outlet of the mixer and then stop of the hydration of the
stucco in the Ethanol for the analysis of the Particle Size Distribution.
4. EQUIPMENTS
Spatula
Plastic container (30*70mm)
Absolute ethanol
5. WORKING INSTRUCTIONS
The sample of slurry has to be collected just after the boots and not at the head
pool.
Use the required equipment to perform properly the sampling
Slurry
Paper

2. Process document
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Direction Industrielle
Direction Assistance des
Procédés
SLURRY SAMPLING Page : 2 / 4
Date : March 3, 2006
© Copyright 2006, Lafarge Plâtres
All rights reserved. No part of this document may be reproduced, stored in a retrieval system, translated, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, without prior written permission of Lafarge Plâtres. CONFIDENTIAL The information contained herein is confidential and proprietary to Lafarge Plâtres. It may not be disclosed or
transferred, directly or indirectly, to any third party without the explicit written permission of Lafarge Plâtres
Take the sample of the slurry just after the boots and in the middle of the width
as shown on the picture below
Take the sample in order to have between 0.5 and 1 cm of paste on the spatula
(see photo)
Plastic flask
with absolute
Ethanol
Spatula

3. Process document
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Direction Industrielle
Direction Assistance des
Procédés
SLURRY SAMPLING Page : 3 / 4
Date : March 3, 2006
© Copyright 2006, Lafarge Plâtres
All rights reserved. No part of this document may be reproduced, stored in a retrieval system, translated, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, without prior written permission of Lafarge Plâtres. CONFIDENTIAL The information contained herein is confidential and proprietary to Lafarge Plâtres. It may not be disclosed or
transferred, directly or indirectly, to any third party without the explicit written permission of Lafarge Plâtres
Make 3 samples (use the 3 flasks)
Put the sample directly into the flask. Make sure that there is no remaining slurry
on the side of the plastic flask. Closed the cover as quickly as possible.
Mix during 20s in order to stop the hydration

4. Process document
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Direction Assistance des
Procédés
SLURRY SAMPLING Page : 4 / 4
Date : March 3, 2006
© Copyright 2006, Lafarge Plâtres
All rights reserved. No part of this document may be reproduced, stored in a retrieval system, translated, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or
otherwise, without prior written permission of Lafarge Plâtres. CONFIDENTIAL The information contained herein is confidential and proprietary to Lafarge Plâtres. It may not be disclosed or
transferred, directly or indirectly, to any third party without the explicit written permission of Lafarge Plâtres
Record the plant, the date and time of sampling on the flask.
Example: Carpentras/15-05-2007/1