Physical and mechanical properties of water inflatable rubber dam

Item		Unit	Outer layer	Middle layer, inner layer	Cover rubber sheet
Tensile strength at break		MPa	14	12	6
Elongation at break		%	400	400	250
Permanent deformation at break		%	30	30	35
Hardness (shore A)			55-65	50-60	55-65
Brittleness temperature		°C	-30	-30	-30
Hot water aging (100 °C × 96 h)	Tensile strength at break	MPa	12	10	5
	Elongation at break	%	300	300	200
Hot water aging (70 °C × 96 h)	Tensile strength at break	MPa	12	10	5
	Elongation at break	%	300	300	200
	Volume expansion ratio	%	15	15	15
Ozone aging: 10000 pphm, temperature 40 °C, stretching 20%, no cracking		min	120	120	100
Wear loss (akron)		cm3/1.61 km	1.0	1.0	1.2
Flexibility, no cracking		Ten thousand times	20	20	20

Specification of water inflatable rubber dam

Code	Height (m)	Inner pressure / outer pressure	Security coefficient (k)	Bottom gaskets width (m)	Dam bag perimeter (m)
WIRDS-1	1.0	1.6	> 8	1.8	3.70
WIRDS-2	1.5	1.55	> 8	2.05	5.40
WIRDS-3	2.0	1.52	> 8	3.40	7.10
WIRDS-4	2.5	1.46	> 8	4.36	8.80
WIRDS-5	3.0	1.4	> 8	5.45	10.70
WIRDS-6	3.5	1.35	> 8	6.8	12.70
WIRDS-7	4.0	1.32	> 8	7.96	14.65
WIRDS-8	4.5	1.3	> 8	9.15	16.50
WIRDS-9	5.0	1.25	> 8	11.1	19.08
WIRDS-10	5.5	1.25	> 8	12.13	20.90
WIRDS-11	6.0	1.25	> 8	13.27	22.80