Screening of Dispersants for Aqueous Barium Sulfate Paste

November 7, 2025

EZHOU ANJEKA TECHNOLOGY CO.,Ltd professional Additive supplier
Dispersant Test Sheet
Test Name	Screening of Dispersants for Aqueous Barium Sulfate Paste
Test Start Date	2025.6.22			Test End Date
Objective: Evaluation of dispersants in a resin-free filler paste based on barium sulfate.
Pigment Paste Formula
Barium Sulfate (800 mesh) Paste Unit:Gram
Component	6220	6210	6070	6272	6270A	6072	6272A
Water	58.8	58.8	58.8	58.8	58.8	58.8	58.8
Dispersant	1	1	1	1	1	1	1
4420	0.2	0.2	0.2	0.2	0.2	0.2	0.2
Filler	40	40	40	40	40	40	40
Total	100	100	100	100	100	100	100
Experimental Method
1. After 2 hours of shaking, viscosity recorded. 2. Stability observed.
Test Result
Resin-Free Paste Viscosity（mpa.s ）
34℃	6220	6210	6070	6272	6270A	6072	6272A
Barium Sulfate	50	50	50	300	200	50	200
In the resin-free barium sulfate paste, dispersants 6070, 6220, 6210, and 6072 demonstrated the most effective viscosity reduction.
Settling Status (50°C, 5 Hours)
	6220	6210	6070	6272	6270A	6072	6272A
Layering / Sedimentation	Layering with sediment	Layering with sediment	Layering with sediment	Layering without sediment	Layering without sediment	Layering with sediment	Layering without sediment
					Minimal layering

Dispersant 6270A demonstrated superior layer stability.
Settling Status (50°C, 24 Hours)
	6220	6210	6070	6272	6270A	6072	6272A
Layering	50%	50%	50%	20%	20%	50%	50%
Sedimentation	Pasty, soft sediment (irreversible)	Pasty, soft sediment (irreversible)	Pasty, soft sediment (irreversible)	Can be re-homogenized by shaking	Can be re-homogenized by shaking	Pasty, soft sediment (irreversible)	Pasty, soft sediment (irreversible)
Dispersants 6270A and 6272 showed good layer stability.
Conclusion
1.In the resin-free barium sulfate paste, dispersants 6070, 6220, 6210, and 6072 demonstrated the best performance in viscosity reduction. 2.Regarding layer stability, dispersant 6270A showed the superior stability.

Personne à contacter :	Ms. Anna
Téléphone :	+8615171019131
Télécopieur :	86-0711-3809626

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