(19)

(11)

EP 0 524 978 A1

(12)

(43) Date of publication: 03.02.1993 Bulletin 1993/05 (21) Application number: 91907017.0 (22) Date of filing: 10.04.1991

(51) International Patent Classification (IPC):  C03B 5/ 43( . ) (86) International application number: PCT/FI1991/000105 (87) International publication number: WO 1991/015433 (17.10.1991 Gazette 1991/24)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 11.04.1990 FI 19900001842 (71) Applicant: PAROC OY AB SF-21600 Pargas (FI)	(72) Inventors: SOLIN, Peter, Arnold, Henrik SF-20760 Piispanristi (FI) HJERPPE, Pertti, Kalevi SF-21600 Pargas (FI) NYGARDAS, Carl-Gustav SF-21600 Pargas (FI) (74) Representative: Barlow, Roy James  J.A. KEMP & CO. 14, South Square, Gray's Inn London WC1R 5LX London WC1R 5LX (GB)